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Characteristic Analysis of Penta-Resistance Restorer Line for Hybrid Rice

  1. Key Laboratory of Agro-Ecological Processes in Subtropical Region, Institute of Subtropical Agriculture, Chinese Academy of Sciences, Changsha 410125, China; University of Chinese Academy of Sciences, Beijing 100049, China; Hunan Institute of Plant Protection, Hunan Academy of Agricultural Sciences, Changsha 410125, China; Yuelushan Laboratory, Changsha 410128, China
  • Contact: XIAO Guoying
  • Supported by:

    This study was supported by grants from the Open Competition Program of Hainan Yazhou Bay Seed Laboratory, China (Grant No. B23YQ1513), the Strategic Priority Research Program of the Chinese Academy of Sciences (Precision Seed Design and Breeding) (Grant No. XDA24030201), and the National Science and Technology Major Project on Breeding of New Genetically Modified Organisms, China (Grant No. 2016ZX08001003-001).

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Abstract:

Rice often suffers from pests, diseases, and weeds throughout its life. Management of pests, diseases, and weeds with agrochemicals increases costs and results in pesticide residues. Developing new germplasm and varieties with multiple resistances is the most economical, sustainable, and efficient way to solve these problems. In this study, marker-assisted backcrossing was used to pyramid multiple resistance genes, and a penta-resistant restorer line, B2A1920, was developed and evaluated for agronomic traits and resistance to diseases, pests, and herbicides. It was confirmed that the developed restorer line B2A1920 contained the herbicide resistance gene Bar, lepidopteran pest resistance gene Cry2Aa, bacterial blight (BB) resistance gene Xa23, blast resistance gene Pi2, and brown planthopper (BPH) resistance genes Bph14 and Bph15, which conferred resistance to glufosinate, lepidopteran pests, BB, blast, and BPH, alongside possessing elite agronomic traits. Its hybrids, Gui A × B2A1920, Quan 9311A × B2A1920, Yexiang A × B2A1920, Xianglong A × B2A1920, Tiantai A × B2A1920, and Shen 9A × B2A1920, also exhibited penta-resistance and elite agronomic traits. These results indicated that a cytoplasmic male sterile restorer line with high combining ability and penta-resistance has been successfully developed.

Key words: hybrid rice, resistance, non-selective herbicide, rice blast, bacterial blight, lepidopteran pest, brown planthopper