论文部分内容阅读
采用 Logistic 生长方程 W=A/(I+Be~(-k■)拟合若干两系杂交稻不同枝梗颖花单位库容的灌浆过程,结合抽穗后的群体物质生产分析,研究组合间的灌浆差异及其生理原因.结果表明:(1)供试组合Ⅰ次和Ⅱ次枝梗之间均存在明显的强弱势灌浆差别,两者灌浆线性期重叠时间长达8-11d,粒位间的营养竞争是普遍存在的.(2)大库容组合可以提高结实期群体叶片的净同化率,发挥叶片的光合潜能.但光合面积较小,库源比仍明显偏大,这是其总体灌浆速率较低、枝梗间差异更大的主要生理原因.(3)不同组合Ⅰ次枝梗前期都具有较强灌浆势和较快启动灌浆的能力,表现营养竞争上的绝对优势.因此组合间其最后库充实率差异之大,可能与颖花机能性障碍的比例多少有关,此外还涉及后期物质转运功能上的差异.
Logistic growth equation W = A / (I + Be ~ (-k ■) was used to fit the grain filling process of spikelets of different branches of two-line hybrid rice. Based on the analysis of population material production after heading, the grouting Differences and their physiological reasons were studied.The results showed that: (1) There was a significant difference between the first and the second branch of the test combination, the linear overlap of the two grouting period was as long as 8-11d, Nutritional competition is ubiquitous. (2) The combination of large storage capacity can improve the net assimilation rate of leaf and the photosynthetic potential of the leaf, but the photosynthetic area is small, (3) The first branch of different combinations had stronger filling potential and faster start-up filling ability, which showed the absolute superiority in nutrition competition. Therefore, The difference between the final library fullness rate may be related to the proportion of spongiform dysfunction, in addition to the latter part of the material transfer function differences.