不同类型水稻籽粒灌浆的生理生化特性研究

Studies on physiobiochemical characteristics of grain filling in different types of rice (Oryza saliva L.)

以3个较大穗型的不同类型水稻品种(组合)“IR_(65600-85)”、“培矮64S/E32”、“Ⅱ优86”为材料,试验研究水稻籽粒灌浆特性及其有关生理生化活性变化结果表明,3个水稻的强势粒起始生长势均高于弱势粒,从而更早进入灌浆盛期;ADPG焦磷酸化酶活性强势粒高峰值均出现在花后6d,弱势粒峰值出现在花后12d;淀粉合成酶活性强势粒在花后0～18d高于弱势粒,尔后弱势粒高于强势拉,但“IR_(65600-85)”弱势粒后期活性仅弱高于强势粒,造成3个水稻的弱势粒灌浆不如强势粒,尤其是“IR_(65600-85)”弱势粒生理生化活性更低,其籽粒充实最差,结实率也最低。

Three different rice cultivars,characterized by a larger panicle type,such as new plant type rice ' IR65600-85','Peiai64S/E32' and 'Eryou86' are used in the experiment to investigate the grain-filling characteristics and the changes of the relevent physiochemical activity.The results show that the superior grains of rice in each entry have higher initial growth power than the inferior grains,in turn entering active grain-filling stage earlier; the superior grains also perform higher activities of ADP-glucose pyrophosphorylase and starch synthase than the inferior grains in each entry during the early stage of grain-filling,it is helpful to promote the transportation of dry matter into the superior grains; there are differences in genotypes in the case of the physiochemical activities,among the three rice cultivars concerned,'IR65600-85' exhibits its poor physiochemical activities,consequently decreases percentage of filled grains and yield.