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本研究选用杂交稻三组合及相应恢复系作为供试材料 ,分田间试验及盆栽试验两部分。结果表明 ,杂交组合及其相应恢复系的籽粒对标记储藏物质及标记光合物质的吸收分别达到 50 %和 80 % ,杂交组合籽粒的吸收量高于相应的恢复系 ,但差异不大 ,说明在储藏物质与光合产物的运输方面 ,杂交组合比相应的恢复系之间无明显差别。但是 ,杂交组合与相应恢复系的强弱势粒对标记储藏物质与光合物质的摄取量之间存在明显差异 ,强势粒是弱势粒吸收量的数倍乃至数十倍 ,尤其是杂交组合的强势粒对标记光合产物的摄取能力远高于弱势粒。杂交稻及其恢复系在物质分配方面表现出强势粒对弱势粒的粒间顶端优势 ,杂交组合比相应恢复系的粒间顶端优势表现更为明显。强势粒对弱势粒物质摄取能力的优势 ,可能是杂交稻籽粒结实率低下的重要原因之一。
In this study, three combinations of hybrid rice and the corresponding restorer lines were selected as the test materials, divided into two parts: field experiment and pot experiment. The results showed that the uptake of labeled storage material and labeled photosynthetic material in the hybrid combinations and their corresponding restorer lines reached 50% and 80% respectively, and the grain uptake of hybrid combinations was higher than that of the corresponding restorer lines, but the difference was not significant There was no significant difference between the hybrid combinations and the corresponding restorers in terms of transport of stored matter and photosynthate. However, there is a significant difference between the uptake potential and the photosynthetic capacity of the hybrid combinations and the corresponding restoring lines. The strong grains are several times or even several times the uptake of the weak grains, especially the strong grains Uptake of labeled photosynthetic products is much higher than that of inferior grains. The hybrid rice and their restorer lines showed the superiority of grain top to the inferior grain in terms of material distribution, and the hybrid grain combinations showed more obvious superiority to the grain top tip of the corresponding restorer line. The advantages of strong grains on the uptake capacity of inferior grains may be one of the important reasons for the low seed setting rate of hybrid rice grains.