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

doi:10.1016/j.rsci.2021.04.003

Abstract

Abstract:

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.

Key words: rice, drought stress, heat stress, combined stress, flowering, grain filling, omics response, phenotyping, genetic enhancement

Vera Jesus Da Costa Maria, Ramegowda Yamunarani, Ramegowda Venkategowda, N. Karaba Nataraja, M. Sreeman Sheshshayee, Udayakumar Makarla. Combined Drought and Heat Stress in Rice: Responses, Phenotyping and Strategies to Improve Tolerance[J]. Rice Science, 2021, 28(3): 233-242.

Figures/Tables 4

Fig. 1. Interaction of individual drought and heat stress under field conditions leading to combined stress in plants.

Fig. 2. Differential responses of physiological traits to combined stress in rice. Fv/Fm, Maximal photochemical efficiency of photosystem II; A, Photosynthetic rate; E, Transpiration rate; gm, Mesophyll conductance; gs, Stomatal conductance.

Fig. 3. Omics approaches for understanding and improving combined drought and heat stress tolerance.

Fig. 4. Potential traits for improving combined stress tolerance in rice. HSPS, Heat shock proteins; ROS, Reactive oxygen species; VPD, Vapour pressure deficit.

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