两系法超级杂交稻粤杂122动态株型结构研究

对两系法超级杂交稻粤杂122苗期、分蘖盛期、第二次枝梗原基分化期、抽穗期、成熟期的株型结构进行调查分析表明,粤杂122与对照培杂67比较,生育前、中期具有明显的生长优势,表现秧苗素质好,植株生长迅速,出叶速度快,分蘖优势强,功能叶叶片较长且窄,叶片开张角较大、叶面积空间较大;生育后期则表现为最后3片功能叶叶片较长且窄、剑叶直立,有效穗数较多,穗数、粒数、粒重较均匀,千粒重较大等特点。认为上述形态性状可作为两系法超级杂交稻的株型结构特征,在育种和栽培实践中加以应用;粤杂122不同生育时期株型结构的性状值可作为华南两系超级杂交稻动态株型结构育种与栽培实践中,不同生育期形态性状选汰以及群体结构调控的参考指标。

Studies on the dynamic plant type structure of a two-line super hybrid rice Yueza 122

Investigation and analysis of the plant-type structure for a two-line super hybrid rice Yueza 122,at seedling,highly tillering,secondary branch primordial differentiation,heading,and ripening stages,showed that Yueza 122 had obviously vegetative growth advance over the standard variety Peiza 67 at both early and intermediate developmental stages,characteristic of better seedling quality,faster leaf growth,more tillers,longer and narrower functional leaves,larger open angle of leaves and larger leaf area space.It also indicated that the super hybrid was characteristic of longer and narrower last three functional leaves,erect flag leaf,more effective panicles,higher 1000-grain weight and more harmonious development among three economic characters of panicle number,grain number per panicle and grain weight.Therefore,the above-mentioned morphological characters can be considered as the feature of plant-type structure for two-line super hybrid rice and used in rice breeding and cultivation practice and the character value of plant-type structure of Yueza 122 at different developmental stages can be taken as reference index of selection or elimilation of morphological characters and population structure control in the dynamic plant-type structure breeding and cultivation practice of two-line super hybrid rice in South China.