减源疏库对不同穗型水稻品种籽粒灌浆和结实性的影响

Effect of Source-sink Treatments on Grain-filling Properties and Seed Setting Ability of Different Panicle Type Rice Cultivars

以直立大穗型常规稻辽粳263和弯穗型杂交稻屉优418为试验材料,用Logistic方程对籽粒灌浆过程进行模拟,研究不同源库处理对不同穗型品种的籽粒灌浆特性和结实性的影响。结果表明,不同源处理对2个品种灌浆参数的影响没有达到显著性水平,不同的库处理使辽粳263的最终粒重表现出极显著差异,不同的库处理在屉优418的各参数间均存在极显著差异。辽粳263穗的中部籽粒重易受到源库的影响,屉优418则是下部籽粒,源库处理对2品种的弱势粒灌浆速率影响最大。增加源库比或降低着粒密度有利于弱势粒平均粒重的提高。

The filling properties of grains on different source-sink in 2 panicle types of rice cultivars were studied in this experiment, and the data were simulated and analyzed with Logistic equation Y = K/（ 1 ＋ ae^-bt） . The results indicated that the equation parameters didn＇t get significant level among different source treatments of 2 rice cultivars, the final grain weight of Liaojing 263 had significantly been influenced by sink volume,and the equation parameters of Tiyou 418 get significant difference among different sink treatments. The middle grain weight of Liaojing 263 responded more sensitive than the others after treatment of source-sink, it was lower grain to Tiyou 418. The grain-filling rate of inferior grain of Liaojing 263 and Tiyou 418 was sensitive affected by the treatments of source and sink. Increasing souree-sink ratio or decreasing grain density was benefit to raise average grain weight of inferior grain.