July 8, 2011
Source: Crop Biotech Update
Xiao Guo-ying, researcher at the Chinese Academy of Sciences, reported the recent advances in the development of herbicide resistant transgenic hybrid rice in China. Herbicide resistance genes were used by Chinese scientists in identifying the purity of hybrid seeds and to perform mechanization of hybrid seed production. Since most important restorer genes are indica varieties and are recalcitrant to transformation, a number of herbicide resistant near-isogenic restorer lines were developed through sexual hybridization of indica and japonica varieties and backcross with indica restorer lines later.
Herbicide resistant male sterile lines or herbicide resistant restorer lines were also used and produced a few herbicide resistant hybrid rice combinations. Researchers are investigating the parental lines of hybrid rice with important traits such as insect resistance and drought tolerance.
Recent Advances in Development of Herbicide Resistant Transgenic Hybrid Rice in China
XIAO Guo-ying
Institute of Subtropical Agriculture, Chinese Academy of Sciences, Changsha 410125, China
Abstract of the report
In addition to weed control in direct seeding field of hybrid rice, herbicide resistance genes were used by Chinese scientists to increase and identify the purity of hybrid seeds, and to realize the mechanization of hybrid seed production. The elite restorer lines, such as Minghui 63, R752, T461, R402, D68 and E32 were transformed directly with herbicide resistance genes, in which D68 and E32 are restorer lines of two-line system and the others are of three-line system. Because almost all of important restorer lines are indica varieties and are recalcitrant in transformation, many herbicide resistant near-isogenic restorer lines were developed by sexual hybridization of indica and japonica varieties and backcross with indica restorer lines later, such as Ce 64, Minghui 63, Teqing, Milyang 46, R402 and 9311, in which 9311 is a restorer line of two-line system. The Pei'ai 64S, P88S, 4008S and 7001S, were transformed with herbicide resistance genes. A few herbicide resistant male sterile lines were developed through sexual hybridization and subsequently systemic selection, such as Bar1259S, Bar2172S, 05Z221A and 05Z227A. With the employment of herbicide resistant male sterile lines or herbicide resistant restorer lines, a few herbicide resistant hybrid rice combinations were developed, such as Xiang 125S/Bar 68-1 and Pei'ai 64S/Bar 9311. Based on herbicide resistance, the research was marching on to investigate the parental lines of hybrid rice with insect resistance, drought tolerance, etc.
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