Practice and thoughts on developing hybrid rice for super high yield by exploiting intersubspecific heterosis
文献类型： 会议论文
第一作者： Zou Jiang-shi
作者： Zou Jiang-shi 1 ; Lu Chuan-gen 1 ;
作者机构： 1.Jiangsu Academy of Agricultural Sciences, Nanjing 210014, China
关键词： rice;breeding;intersubspecific hybrid;plant type;two-line approach
会议名称： International symposium on hybrid rice
主办单位：
页码： 1-9
摘要： Since the breakthrough in grain yield owing to improvements of dwarf rice and the three-line system of hybrid rice, rice breeding for high yield showed little significant progress in the next two decades. It was considered that using heterosis between subspecific varieties (Oryza sativa L.) would be an effective approach to increase yield further. During 1987-93, an indica-japonica hybrid,Yayou 2, yielded as high as 10.5 t ha–1. However, it failed to be commercialized because of a seed purity problem due to nonuniform emasculation by chemical agents in seed production, and sensitivity of seed set in F1 plants to environmental conditions. In the past decade, the authors released two intersubspecific hybrids, Liangyoupeijiu (Peiai64S/9311, javanica/indica) and LiangyouE32(Peiai64S/E32, javanica/japonica), both of which exhibited grain yield higher than 10.5 t ha–1, and were widely considered as pioneers of super hybrid rice.Of these two, Liangyoupeijiu has been successfully popularized over 7 million ha in wide climatic areas and it has occupied the top position in rice-planting area for several years in China, while LiangyouE32 had a record yield, and offered a model of plant ideotype for super hybrid rice. It was considered that, in combination with plant ideotype, active physiological functions, and wide-range adaptability to ecological conditions, the exploitation of indica-japonica heterosis would be a key approach for super hybrid rice breeding.
分类号： Q781`S334
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