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1. Carbon Nanoparticle Exerts Positive Growth Effects with Increase in Productivity by Down-Regulating Phytochrome B and Enhancing Internal Temperature in Rice

Panigrahy Madhusmita, Das Subhashree, Poli Yugandhar, Kumar Sahoo Pratap, Kumari Khushbu, C. S. Panigrahi Kishore

Rice Science 2021, 28 (3): 289-300. DOI: 10.1016/j.rsci.2021.04.007

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The effects of carbon nanoparticle (CNP) on rice variety Swarna (MTU7029) were investigated. CNP induced effects similar to shade avoidance response (SAR) of Arabidopsis, with increase in shoot length, root length, root number, cotyledon area, chlorophyll content and total sugar content in rice seedlings. In mature plants, CNP treatment resulted increase in plant height, number of productive tillers per plant, normalized difference vegetation index, quantum yield and root growth. A total of 320 mg of CNP per plant administered in four doses resulted in improved grain traits such as filled grain rate, 100-grain weight, grain length/width ratio, hulling rate, milling rate and head rice recovery. Seeds from the CNP-treated plants showed increase in amylose, starch and soluble sugar contents compared to controls. Strikingly, CNP treatment showed an average of 17.5% increase in yield per plant. Upon investigation to the molecular mechanism behind CNP induction of SAR, a significant downregulation of phytochrome B transcript was found. Decrease in perception of red wavelengths led to responses similar to SAR. Increase in plant’s internal temperature by 0.5 ºC ± 0.1 ºC was recorded after CNP treatment. We suggest that the internalized CNP aggregates may serve to absorb extra photons thereby increasing the internal temperature of plants. Phytochrome B accounts the hike in internal temperature and initiates a feed-back reduction of its own transcription. We suggest that moderate SAR is beneficial for rice plants to improve agronomic traits and yield. It presents a potential non-transgenic method for improving rice yield by CNP treatment.

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2. Water Management for Improvement of Rice Yield, Appearance Quality and Palatability with High Temperature During Ripening Period

Matsue Yuji, Takasaki Katsuya, Abe Jun

Rice Science 2021, 28 (4): 409-416. DOI: 10.1016/j.rsci.2021.05.011

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To clarify the optimal water management in large-scale fields under high temperatures at the ripening period, effective water managements during this period for improvement of yield, appearance quality and palatability were investigated. Compared with intermittent irrigation and flooded irrigation, the soil temperature with saturated irrigation remained low throughout the day, and the decrease rate of the bleeding rate of hills was the lowest. These results suggested that the saturated irrigation maintained root activity. For the three irrigation types, the number of spikelets per m² and 1000-grain weight were similar, however, saturated irrigation resulted in significantly higher rice yield due to improvement in the percentage of ripened grains. The saturated irrigation produced a high percentage of perfect rice grains and thicker brown rice grain, furthermore, the palatability of cooked rice was excellent because protein content and hardness/adhesion ratio were both low. Thus, under high-temperature ripening conditions, soil temperature was lowered and root activity was maintained when applying saturated irrigation after heading time. The results indicated that saturated irrigation is an effective countermeasure against high-temperature ripening damage.

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3. Effect of Milling and Parboiling Processes on Arsenic Species Distribution in Rice Grains

Chiara Fontanella Maria, Martin Maria, Tenni Daniele, Maria Beone Gian, Romani Marco

Rice Science 2021, 28 (4): 402-408. DOI: 10.1016/j.rsci.2021.05.010

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This study identified the role of milling and parboiling on arsenic (As) content and its species in large numbers of rice samples. Total As contents were 108 ± 33 μg/kg in polished rice grains (PR), 159 ± 46 μg/kg in unpolished rice grains (UR), 145 ± 42 μg/kg in parboiled polished rice grains (PPR) and 145 ± 44 μg/kg in parboiled unpolished rice grains (PUR). The percentages of inorganic As (iAs) were 66% ± 8% in PR and from 72% to 77% in other grain categories. The polishing process reduced the As content in the rice grains, removing outer part of the UR with high amount of As, whereas the parboiling technique transferred the semimetal content within the grain. Total As and iAs contents were not significantly different in UR, PPR and PUR, homogenizing its distribution inside the grains. The results allowed to understand how different operations affect As fate and its chemical forms in grains.

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4. Valuation of Rice Postharvest Losses in Sub-Saharan Africa and Its Mitigation Strategies

Atanga Ndindeng Sali, Candia Alphonse, Lamare Mapiemfu Delphine, Rakotomalala Vohangisoa, Danbaba Nahemiah, Kulwa Kurahisha, Houssou Paul, Mohammed Sow, M. Jarju Ousman, S. Coulibaly Salimata, A. Baidoo Elvis, Moreira Jean, Futakuchi Koichi

Rice Science 2021, 28 (3): 212-216. DOI: 10.1016/j.rsci.2021.04.001

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5. Suberin Biopolymer in Rice Root Exodermis Reinforces Preformed Barrier Against Meloidogyne graminicola Infection

Singh Divya, K. Dutta Tushar, N. Shivakumara Tagginahalli, Dash Manoranjan, Bollinedi Haritha, Rao Uma

Rice Science 2021, 28 (3): 301-312. DOI: 10.1016/j.rsci.2021.04.008

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Exploration of novel genetic resources against root-knot nematode (RKN) is necessary to strengthen the resistance breeding program in cultivated rice, and investigations on the role of genotype-specific root anatomy in conferring a structural barrier against nematode invasion are largely underexplored. Here, we reported a highly-resistant rice germplasm Phule Radha that conferred remarkably lower RKN parasitic fitness in terms of reduced penetration and delayed development and reproduction when compared with susceptible cultivar PB1121. Using histological and biochemical analyses, we demonstrated that an enhanced suberin deposition in the exodermal root tip tissue of Phule Radha compared to PB1121 can effectively form a penetrative barrier against RKN infection, and this preformed barrier in the control tissue did not necessarily alter to a greater extent when challenged with RKN stress. Using qRT-PCR analysis, we showed that a number of suberin biosynthesis genes were greatly expressed in the exodermis of Phule Radha compared to PB1121. In sum, the present study established the role of rice exodermal barrier system in defense against an important soil-borne pathogen.

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6. OsbZIP72 Is Involved in Transcriptional Gene-Regulation Pathway of Abscisic Acid Signal Transduction by Activating Rice High-Affinity Potassium Transporter OsHKT1;1

Baoxiang Wang, Yan Liu, Yifeng Wang, Jingfang Li, Zhiguang Sun, Ming Chi, Yungao Xing, Bo Xu, Bo Yang, Jian Li, Jinbo Liu, Tingmu Chen, Zhaowei Fang, Baiguan Lu, Dayong Xu, Kazeem Bello Babatunde

Rice Science 2021, 28 (3): 257-267. DOI: 10.1016/j.rsci.2021.04.005

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We created CRISPR-Cas9 knock-out and overexpressing OsbZIP72 transgenic rice plants to gain a better understanding of the role and molecular mechanism of OsbZIP72 gene in stress tolerance, which has remained largely elusive. OsbZIP72 was expressed and integrated into rice transgenic plant genomes, and the OsbZIP72 transcript in overexpression lines was elicited by salinity, abscisic acid (ABA) and drought stresses. OsbZIP72 overexpressing plants showed higher tolerance to drought and salinity stresses, while knock-out transgenic lines showed higher sensitivity to these stresses. The differentially expressed genes (DEGs) from RNA-sequencing data encompassed several abiotic stress genes, and the functional classification of these DEGs demonstrated the robust transcriptome diversity in OsbZIP72. Yeast one-hybrid, along with luciferase assay, indicated that OsbZIP72 acted as a transcriptional initiator. Remarkably, electrophoresis mobility assay revealed that OsbZIP72 bound directly to the ABA- responsive element in the OsHKT1;1 promoter region and activated its transcription. Overall, our findings revealed that OsbZIP72 can act as a transcriptional modulator with the ability to induce the expression of OsHKT1;1 in response to environmental stress through an ABA-dependent regulatory pathway, indicating that OsbZIP72 can play a crucial role in the ABA-mediated salt and drought tolerance pathway in rice.

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7. MULTI-FLORET SPIKELET 4 (MFS4) Regulates Spikelet Development and Grain Size in Rice

Yan Wang, Xiaoqin Zeng, Lu Lu, Qinglan Cheng, Fayu Yang, Mingjiang Huang, Mao Xiong, Yunfeng Li

Rice Science 2021, 28 (4): 344-357. DOI: 10.1016/j.rsci.2021.05.005

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In rice, the spikelet is the basic unit of inflorescence, and its development is important for determining the grain yield and quality. We reported a rice spikelet mutant multi-floret spikelet 4 (mfs4) which resulted in the production of extra floral organs or a whole extra floret, and elongated sterile lemmas. The results suggested that the mutation of the MFS4 gene interfered with spikelet meristem determinacy and floral organ identity. In addition, the plant height and the grain length and width in the mfs4 mutant were all less than those in the wild type. Using the bulked segregant analysis method, the MFS4 gene was localized in a 557-kb region on the long arm of chromosome 1. Sequence analysis showed that there was a C-base deletion at the open reading frame of LOC_Os01g67430. Further tests indicated that a wild type copy of LOC_Os01g67430 was able to reverse the mfs4 defects, which indicated that LOC_Os01g67430 was the MFS4 gene. The MFS4 gene encodes a lipase located in the mitochondria and is expressed strongly in the young inflorescence. qRT-PCR results showed that the expression of some genes that were known to regulate spikelet meristem determinacy and grain size were decreased in the mfs4 mutant, which indicated that the MFS4 gene regulates spikelet meristem determinacy and grain size by modulating the expression of these genes.

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8. Genome-Wide Association Study of Nitrogen Use Efficiency and Agronomic Traits in Upland Rice

Rakotoson Tatiana, Dusserre Julie, Letourmy Philippe, Frouin Julien, Ramonta Ratsimiala Isabelle, Victorine Rakotoarisoa Noronirina, Cao Tuong-Vi, Vom Brocke Kirsten, Ramanantsoanirina Alain, Ahmadi Nourollah, Raboin Louis-Marie

Rice Science 2021, 28 (4): 379-390. DOI: 10.1016/j.rsci.2021.05.008

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Genome-wide association study (GWAS) was performed for 16 agronomic traits including nitrogen use efficiency (NUE) and yield-related components using a panel of 190 mainly japonica rice varieties and a set of 38 390 single nucleotide polymorphism (SNP) markers. This panel was evaluated under rainfed upland conditions in Madagascar in two consecutive cropping seasons with two contrasted nitrogen input levels. Using another set of five grain traits, we identified previously known genes (GW5, GS3, Awn1 and Glabrous1), thus validating the pertinence and accuracy of our datasets for GWAS. A total of 369 significant associations were detected between SNPs and agronomic traits, gathered into 46 distinct haplotype groups and 28 isolated markers. Few association signals were identified for the complex quantitative trait NUE, however, larger number of quantitative trait loci (QTLs) were detected for its component traits, with 10 and 2 association signals for nitrogen utilization efficiency and nitrogen uptake efficiency, respectively. Several detected association signals co-localized with genes involved in nitrogen transport or nitrogen remobilization within 100 kb. The present study thus confirmed the potential of GWAS to identify candidate genes and new loci associated with agronomic traits. However, because of the quantitative and complex nature of NUE-related traits, GWAS might have not captured a large number of QTLs with limited effects.

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9. Breeding Novel Short Grain Rice for Tropical Region to Combine Important Agronomical Traits, Biotic Stress Resistance and Cooking Quality in Koshihikari Background

Saichompoo Uthomphon, Narumol Possawat, Nakwilai Pawat, Thongyos Peeranut, Nanta Aekchupong, Tippunya Patompong, Ruengphayak Siriphat, Itthisoponkul Teerarat, Bueraheng Niranee, Cheabu Sulaiman, Malumpong Chanate

Rice Science 2021, 28 (5): 479-792. DOI: 10.1016/j.rsci.2021.07.008

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Breeding program strategies to develop novel short grain white rice varieties such as japonica (short grain) that introgress biotic stress resistance and high grain quality have been developed using indica rice (Pin Kaset+4 and Riceberry) for applications in japonica rice (Koshihikari) improvement. Four breeding lines showing promising agronomic performance with short grain and low amylose content (< 20%) were obtained. In addition, sensory testing of these breeding lines showed high scores that similar to Koshihikari. Two promising lines, KP48-1-5 and KP48-1-9, which possessed a combination of four genes resistance to different biotic stresses (Bph3 + TPS + Xa21 + Pi-ta) and four genes for grain quality (GS3 + SSIIa + wx^b + badh2), were developed using marker-assisted selection (MAS) with the pedigree method. The current study clearly illustrated the successful use of MAS in combining resistance to multiple biotic stresses while maintaining a high yield potential and preferred grain quality. Moreover, the results indicated that this breeding program, which includes crossing temperate japonica with indica, can create novel short grain rice varieties adapted to a tropical environment, like the japonica type.

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10. Improvement of Upland Rice Variety by Pyramiding Drought Tolerance QTL with Two Major Blast Resistance Genes for Sustainable Rice Production

Balija Vishalakshi, Bangale Umakanth, Ponnuvel Senguttuvel, Makarand Barbadikar Kalyani, Prasad Madamshetty Srinivas, Rao Durbha Sanjeeva, Yadla Hari, Madhav Maganti Sheshu

Rice Science 2021, 28 (5): 493-500. DOI: 10.1016/j.rsci.2021.07.009

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Varalu is an early maturing rice variety widely grown in the rainfed ecosystem preferred for its grain type and cooking quality. However, the yield of Varalu is substantially low since it is being affected by reproductive drought stress along with the blast disease. The genetic improvement of Varalu was done by introgressing a major yield QTL, qDTY_12.1, along with two major blast resistance genes i.e. Pi54 and Pi1 through marker-assisted backcross breeding. Both traits were transferred till BC₂ generation and intercrossing was followed to pyramid the two traits. Stringent foreground selection was carried out using linked markers as well as peak markers (RM28099, RM28130, RM511 and RM28163) for the targeted QTL (qDTY_12.1), RM206 for Pi54 and RM224 for Pi1. Extensive background selection was done using genome-wide SSR markers. Six best lines (MSM-36, MSM-49, MSM-53, MSM-57, MSM-60 and MSM-63) having qDTY_12.1 and two blast resistance genes in homozygous condition with recurrent parent genome of 95.0%?96.5% having minimal linkage drag of about 0.1 to 0.7 Mb were identified. These lines showed yield advantage under drought stress as well as irrigated conditions. MSM-36 showed better performance in the national coordinated trials conducted across India, which indicated that improved lines of Varalu expected to replace Varalu and may have an important role in sustaining rice production. The present study demonstrated the successful marker-assisted pyramiding strategy for introgression of genes/QTLs conferring biotic stress resistance and yield under abiotic stress in rice.

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11. iTRAQ-Based Proteomics Investigation of Critical Response Proteins in Embryo and Coleoptile During Rice Anaerobic Germination

Guangchen Zhang, Zimeng Liu, Youhong Liu, Noriyuki Kuya, Yuchen Hua, Hongru Shi, Weilin Zhao, Yuqing Han, Toshio Yamamoto, Wenfu Chen, Jian Sun

Rice Science 2021, 28 (4): 391-401. DOI: 10.1016/j.rsci.2021.05.009

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Direct-seeding of rice has become popular in recent years due to its low cost and convenience, however, hypoxic condition limits seedling establishment. In this study, weedy rice WR04-6 with high germination ability under anaerobic conditions was used as a gene donor, and we successfully improved the seedling establishment rate of rice cultivar Qishanzhan (QSZ) based on selection of a new rice line R42 from the recombinant inbred line population. R42 inherited high anaerobic germination (AG) ability, and was used for isobaric tags for relative and absolute quantitation (iTRAQ)-based comparative proteomic studies with QSZ to further explore the molecular mechanism of AG. A total of 719 differentially abundant proteins (DAPs) were shared by R42 and QSZ responded to AG, and thus defined as common response DAPs. A total of 300 DAPs that responded to AG were only identified from R42, which were defined as tolerance-specific DAPs. The common response and tolerance-specific DAPs had similar biochemical reaction processes and metabolic pathways in response to anoxic stress, however, they involved different proteins. The tolerance-specific DAPs were involved in amino acid metabolism, starch and sucrose metabolism, tricarboxylic acid cycle pathway, ethylene synthesis pathway, cell wall-associated proteins and activity of active oxygen scavenging enzyme. The in silico protein-protein interactions for the top 60 DAPs indicated that tolerance-specific DAPs had relatively independent protein interaction networks in response to an anoxic environment compared with common response DAPs. The results of physiological indicators showed that α-amylase and superoxide dismutase activities of R42 were significantly increased under anoxic conditions compared with aerobic conditions. Multiple lines of evidence from western blot, physiological analysis and quantitative real-time PCR jointly supported the reliability of proteomics data. In summary, our findings deepened the understanding of the molecular mechanism for the rice response to AG.

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12. Stress-Activated Protein Kinase OsSAPK7 Regulates Salt- Stress Tolerance by Modulating Diverse Stress-Defensive Responses in Rice

Dan Zeng, Chunchao Wang, Junpin Xie, Fan Zhang, Jialing Lu, Xiaorong Shi, Yingyao Shi, Yongli Zhou

Rice Science 2021, 28 (6): 547-556. DOI: 10.1016/j.rsci.2021.09.003

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Soil salinity is an environmental threat limiting rice productivity. Identification of salinity tolerance genes and exploitation of their mechanisms in plants are vital for crop breeding. In this study, the function of stress-activated protein kinase 7 (OsSAPK7), a SnRK2 family member, was characterized in response to salt stress in rice. Compared with variety 9804, OsSAPK7-overexpression plants had a greater survival rate, increased chlorophyll and proline contents, and superoxide dismutase and catalase activities at the seedling stage under salt-stress conditions, as well as decreased sodium potassium ratio (Na⁺/K⁺) and malondialdehyde contents. After salt stress, the OsSAPK7 knockout plants had lower survival rates, increased Na⁺/K⁺ ratios and malomdiadehyde contents, and decreased physiological parameters compared with 9804. These changes in transgenic lines suggested that OsSAPK7 increased the salt tolerance of rice by modulating ion homeostasis, redox reactions and photosynthesis. The results of RNA-Seq indicated that genes involved in redox-dependent signaling pathway, photosynthesis and zeatin synthesis pathways were significantly down-regulated in the OsSAPK7 knockout line compared with 9804 under salt-stress condition, which confirmed that OsSAPK7 positively regulated salt tolerance by modulating diverse stress-defensive responses in rice. These findings provided novel insights for the genetic improvement of rice and for understanding the regulatory mechanisms of salt-stress tolerance.

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13. Development of Chromosome Segment Substitution Lines and Genetic Dissection of Grain Size Related Locus in Rice

Riaz Aamir, Huimin Wang, Zhenhua Zhang, Anley Zegeye Workie, Yanhui Li, Hong Wang, Pao Xue, Zequn Peng, Xihong Shen, Shihua Cheng, Yingxin Zhang

Rice Science 2021, 28 (4): 322-324. DOI: 10.1016/j.rsci.2021.05.003

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14. Root Aeration Promotes Cadmium Accumulation in Rice by Regulating Iron Uptake-Associated System

Qina Huang, Yinliang Wu, Guosheng Shao

Rice Science 2021, 28 (5): 511-520. DOI: 10.1016/j.rsci.2021.07.011

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Different cadmium (Cd)-accumulated rice genotypes (Erjiunan 1 and Fupin 36) were used to explore the effect of rice rhizosphere aeration on Cd uptake and accumulation. Aeration in the nutrient solution influenced the agronomic characteristics induced by Cd-stress, such as the increases of rice root length and root vigor, but the reductions of plant height and shoot dry weight. Aeration also alleviated the decreasing effects of Cd stress on antioxidant enzyme activities and soluble protein, malonaldehyde and nicotianamine contents in rice. Moreover, with aeration treatment, the accumulation and bioavailability of metal elements changed significantly, with a Cd increase and an Fe reduction in both rice genotypes. In addition, at the molecular level, aeration upregulated the expression of Fe-inducible genes (such as OsIRT1, OsNRAMP1, OsYSL15 and OsNAS3). Furthermore, as a Cd²⁺/Fe²⁺ transporter, the high transcription level of OsNRAMP1 can elevate the Cd uptake and translocation in rice due to the Fe reduction caused by aeration and Cd-exposure, which indicated that OsNRAMP1 might play a crucial role in the effect of aeration on Cd uptake and accumulation.

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15. Nitrogen Deep Placement Combined with Straw Mulch Cultivation Enhances Physiological Traits, Grain Yield and Nitrogen Use Efficiency in Mechanical Pot-Seedling Transplanting Rice

Li Lin, Zhang Zheng, Tian Hua, Umair Ashraf, Yousef Alhaj Hamoud, Al Aasmi Alaa, Tang Xiangru, Duan Meiyang, Wang Zaiman, Pan Shenggang

Rice Science 2022, 29 (1): 89-100. DOI: 10.1016/j.rsci.2021.12.008

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To assess the effects of straw return coupled with deep nitrogen (N) fertilization on grain yield and N use efficiency (NUE) in mechanical pot-seedling transplanting (MPST) rice, the seedlings of two rice cultivars, i.e., Yuxiangyouzhan and Wufengyou 615 transplanted by MPST were applied with N fertilizer at 150 kg/hm² and straw return at 6 t/hm² in early seasons of 2019 and 2020. The experiment comprised of following treatments: CK (no fertilizer and no straw return), MDS (deep N fertilization and straw return), MBS (broadcasting fertilizer and straw return), MD (deep N fertilization without straw return), MB (broadcasting fertilizer without straw return). Results depicted that the MDS treatment significantly increased the rice yield by 41.69%?72.22% due to total above-ground biomass, leaf area index and photosynthesis increased by 54.70%?55.80%, 38.52%?52.17% and 17.89%?28.40%, respectively, compared to the MB treatment. In addition, the MDS treatment enhanced the total N accumulation by 37.74%?43.69%, N recovery efficiency by 141.45%?164.65%, N agronomic efficiency by 121.76%? 134.19%, nitrate reductase by 46.46%?60.86% and glutamine synthetase by 23.56%?31.02%, compared to the MB treatment. The average grain yield and NUE in both years for Yuxiangyouzhan were higher in the MDS treatment than in the MD treatment. Hence, deep N fertilization combined with straw return can be an innovative technique with improved grain yield and NUE in MPST in South China.

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16. Regulation of OsPR10a Promoter Activity by Phytohormone and Pathogen Stimulation in Rice

Ersong Zheng, Xuming Wang, Rumeng Xu, Feibo Yu, Chao Zheng, Yong Yang, Yang Chen, Jianping Chen, Chengqi Yan, Jie Zhou

Rice Science 2021, 28 (5): 442-456. DOI: 10.1016/j.rsci.2021.07.005

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OsPR10a is one of the well known pathogenesis-related genes in rice, and is induced by multiple plant hormones and pathogens. However, the underlying transcriptional regulation mechanisms in response to different signals and their crosstalks are still largely unknown. In order to find new players participated in the activation of OsPR10a, we systematically analyzed the basal expression patterns as well as the expression responses of a 2.5 kb OsPR10a promoter in rice transgenic plants after phytohormone and pathogen stimulations. In agreement with the native gene expression, the OsPR10a promoter can drive glucuronidase (GUS) gene expressing in spots of leaf cells, leaf trichomes, lemmas and paleae, germinating embryos, calli and root tips. The leaf expression of OsPR10a::GUS was dramatically increased upon jasmonic acid (JA) and cytokinin (CK) treatments, or challenges of the pathogen Magnaporthe grisea and Xanthomonas oryzae pv. oryzae. Thus, the OsPR10a promoter reported here can faithfully reflect its native gene expression. The effects of several JA and CK responsive OsWRKY genes on the regulation of OsPR10a promoter were then inspected by luciferase transient expression assay, and the JA inducible OsWRKY10 transcription factor was found as a new positive regulator of OsPR10a. However, the key transcription factors of JA and CK signaling pathways, OsMYC2 and B-type response regulators, were not responsible for the activation of OsPR10a promoter. Our findings provided new insights into the regulation of OsPR10a expression during plant-hormone/pathogen interactions, and the OsPR10a reporter system can be useful to unravel novel regulators from both pathogen and host.

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17. Combined Drought and Heat Stress in Rice: Responses, Phenotyping and Strategies to Improve Tolerance

Vera Jesus Da Costa Maria, Ramegowda Yamunarani, Ramegowda Venkategowda, N. Karaba Nataraja, M. Sreeman Sheshshayee, Udayakumar Makarla

Rice Science 2021, 28 (3): 233-242. DOI: 10.1016/j.rsci.2021.04.003

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Simultaneous occurrence of drought and heat stress will have significant negative impact on rice yield, especially under upland conditions. The projected increase in global temperatures and reduced precipitation will increase the frequency of occurrence and intensity of these stresses, threatening rice production. Despite recognizing the importance of combined stress in rice, the knowledge generated in this area is very limited. Though complex, understanding combined stress tolerance of rice under water saving cultivation is more critical towards development of climate resilient rice cultivars. Here, we summarized the effects of combined stress on rice physiology with more emphasis on reproductive stage. Omics responses, phenotyping and physiology challenges and potential strategies for improving combined stress tolerance in rice are also discussed.

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18. OsbZIP09, a Unique OsbZIP Transcription Factor of Rice, Promotes Rather Than Suppresses Seed Germination by Attenuating Abscisic Acid Pathway

Chuxin Wang, Chengchao Zhu, Yu Zhou, Min Xiong, Jindong Wang, Huang Bai, Chenya Lu, Changquan Zhang, Qiaoquan Liu, Qianfeng Li

Rice Science 2021, 28 (4): 358-367. DOI: 10.1016/j.rsci.2021.05.006

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We successfully identified a novel and unique OsbZIP transcription factor, OsbZIP09, whose mutants exhibited longer seeds and less severe pre-harvest sprouting than the wild type, but shared similar germination rate as the wild type under normal germination conditions. The expression of OsbZIP09 was induced by abscisic acid (ABA) and declined as the germination process. As a nucleus-localized transcription factor, the conserved binding motif of OsbZIP09 was identified via DNA affinity purification sequencing technique. Further evidences indicated that OsbZIP09 directly enhanced the expression of ABA catabolism gene ABA8ox1, thus reducing ABA accumulation. In addition, OsbZIP09 also directly bound to the promoter of LEA3 gene to inhibit its expression, thus further alleviating the suppressive effect of ABA on seed germination. These results demonstrated that OsbZIP09 likely functions as a brake of the ABA pathway to attenuate the inhibitory effect of ABA on rice seed germination via dual strategies.

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19. Root Morphology and Anatomy Affect Cadmium Translocation and Accumulation in Rice

Anwen Xiao, Danting Chen, Wai Chin Li, Zhihong Ye

Rice Science 2021, 28 (6): 594-604. DOI: 10.1016/j.rsci.2021.03.003

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Paddy fields contaminated with cadmium (Cd) present decreased grain yield and produce Cd-contaminated grains. Screening for low-Cd-accumulating cultivars is a useful method to reduce the amount of Cd in the grains. The present study aimed to examine the roles of the root morphology and anatomy in Cd translocation and accumulation in rice plants. Twenty-two rice cultivars were used in the first experiment, after which two cultivars [Zixiangnuo (ZXN) and Jinyou T36 (JYT36)] were selected and used in subsequent experiments under hydroponic conditions. The results showed that there were significant differences in Cd concentrations in the shoots (ranging from 4 to 100 mg/kg) and the Cd translocation rates (shoot/root) (from 7% to 102%) among the 22 cultivars, and the shoot Cd concentration was significantly correlated with the Cd translocation rate of the 22 cultivars under 0.1 mg/L Cd treatment. Compared with cultivar ZXN, JYT36 had greater root Cd uptake and accumulation but lower shoot Cd accumulation and Cd translocation rate. The number of root tips per surface area of cultivar ZXN was greater than that of JYT36, while the average root diameter was lower than that of JYT36. Compared with ZXN, JYT36 had stronger apoplastic barriers, and the Casparian bands and suberin lamellae in the root endodermis and exodermis were closer to the root apex in both the control and Cd treatments, especially for suberin lamellae in the root exodermis with Cd treatments, with a difference of 25 mm. The results also showed that, compared with ZXN, JYT36 had greater percentages of Cd bound in cell walls and intracellular Cd but lower Cd concentrations in the apoplastic fluid under the Cd treatment. The results suggested that Cd translocation, rather than root Cd uptake, is a key process that determines Cd accumulation in the rice shoots. The root morphological and anatomical characteristics evidently affect Cd accumulation in the shoots by inhibiting Cd translocation, especially via the apoplastic pathway. It was possible to pre-screen low-Cd-accumulating rice cultivars on the basis of their root morphology, anatomical characteristics and Cd translocation rate at the seedling stage.

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20. Application of Rice Husk Biochar for Achieving Sustainable Agriculture and Environment

Asadi Hossein, Ghorbani Mohammad, Rezaei-Rashti Mehran, Abrishamkesh Sepideh, Amirahmadi Elnaz, Chengrong Chen, Gorji Manouchehr

Rice Science 2021, 28 (4): 325-343. DOI: 10.1016/j.rsci.2021.05.004

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This paper critically reviewed the current knowledge and challenges of rice husk biochar (RHB) production and its effects on soil properties, plant growth, immobilization of heavy metals, reduction of nutrient leaching and mitigation of greenhouse gas emissions. The characteristics of RHBs produced at various pyrolysis temperatures were discussed and compared to biochars derived from other agro- industrial wastes. RHBs produced at higher pyrolysis temperatures show lower hydrogen/carbon ratio, which suggests the presence of higher aromatic carbon compounds. The increase of pyrolysis temperature also results in production of RHBs with higher ash content, lower yield and higher surface area. RHB usually has higher silicon and ash contents and lower carbon content compared to biochars derived from other feedstocks at the same pyrolysis conditions. Although it depends on soil type, RHB application can improve soil organic carbon content, cation exchange capacity, available K concentration, bulk density and microbial activity. The effect of RHB on soil aggregation mainly depends on soil texture. The growth of different crops is also enhanced by application of RHB. RHB addition to soil can immobilize heavy metals and herbicides and reduce their bioavailability. RHB application shows a significant capacity in reduction of nitrate leaching, although its magnitude depends on the biochar application rate and soil biogeochemical characteristics. Use of RHB, especially in paddy fields, shows a promising mitigation effect on greenhouse gas (CH₄, CO₂ and N₂O) emissions. Although RHB characteristics are also related to other factors such as pyrolysis heating rate and residence time, its performance for specific applications (e.g. carbon sequestration, pH amendment) can be manipulated by adjusting the pyrolysis temperature. More research is needed on long-term field applications of RHB to fully understand the advantages and disadvantages of RHB as a soil amendment.

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