弯穗型水稻籽粒充实程度的研究

为明确北方弯穗型水稻籽粒的充实状况,以辽宁省常规粳稻为试材,对稻穗中不同部位籽粒充实程度及其与相关农艺性状的关系进行了研究。结果表明:饱谷粒内部存在充实程度差异,体现为至少可以分成密度>1.06,>1.04,>1.02等不同的充实组分;二次枝梗籽粒充实率较一次枝梗低,其中中、下部二次枝梗表现尤甚,中、下部二次枝梗的空秕粒粒数和中部二次枝梗密度>1.06的籽粒粒数百分比在品种间变异较大;籽粒充实率与结实率变化规律一致;糙米率大小与籽粒充实度高低相对应,相同充实度籽粒糙米率弱势粒高于强势粒;籽粒充实率与结实率、千粒重、每株穗数呈显著正相关,与单株粒重之间具有显著的正向直接效应,但相关系数不大。

Study on the Grain-Filling Rates of the Curved Panicle Rice

In order to characterize the grain-filling of curved panicle type rice,we exploited Liaoning japonica curved panicle rice as the material,and then study the correlation between the rice grain filling rates in different positions and a few agronomic traits.The results showed that the filled grain presented differences among grain-filling rates which can be dissected to different groups,such as >1.06,>1.04,>1.02,by specific gravity.The grain-filling percentage of the secondary branches was lower than primary branches,moreover the middle and lower secondary branches had a typical performance of all.There was great variation of infill-grains between growing at middle and lower secondary branches and the grain growing at middle secondary branches with specific gravity higher than 1.06.The rule of movement of grain-filling percentage and setting percentage was consistent.The unpolished rice percentage was corresponding to the grain-filled rates;Under the same grain-filling percentage level,the unpolished rice percentage of inferior grain was higher than superior grain.The grain-filling percentage had a significant positive correlation with setting percentage,thousand kernel weight,spike number/individual number,however it had a small correlation coefficient with individual-grain-weight which had a directly significant positive effect on the grain-filling percentage.