重穗型杂交稻D优527的栽培生理特点及调控对策研究

Cultural and Physiological Characteristics and Its Cultivation Practice of the Heavy Panicle Type Hybrid Rice Dyou 527

对重穗型杂交稻 D优 5 2 7与中等穗型的杂交稻组合汕优 6 3和 R5 2 7的栽培生理特性进行了比较。重穗型杂交稻 D优 5 2 7秆硬抗倒、穗大粒多、库容量大 ,单穗重大 ,产量高 ,且具很高的增产潜力。其茎鞘物质在齐穗后向穗部的转运量大、转运率和转换率高 ,但后期光合生产量相对较低 ,从而导致库虽大但由于源的相对不足而使库的充实度偏低。因此 ,增强后期光合生产力以增加源的供应是提高其籽粒充实度 ,进一步提高其产量的关键。 D优 5 2 7已具备高质量群体结构特征 。

High yielding characteristics, dry matter production, and its translocation and high yielding cultivation practice of the heavy panicle type hybrid rice Dyou 527 bred recently were studied, as compared with those of Shanyou 63 and R527, with medium panicle type varieties. Results showed that Dyou 527 had thick stem, large panicle and sink, high grain weight per panicle and grain yield, and high yield potential. Dyou 527 had the excellent characteristics of dry matter translocation to panicle, but the dry matter production of Dyou 527 at late growth stage was relatively low, which resulted in a little poor sink filling because its source didn't relatively match with its large sink, which suggested that it is important to increase the photosynthesis productivity at late growth stage in order to supply sufficient source for the higher grain filling rate and grain yield of Dyou 527. Dyou 527 possessed the characteristics of high quality population, and its cultivation practice was also presented.