Abstract:

Abstracts: Objactive：To understand physiological bases of grain filling for Liang You Pei Jiu at the late development stage and study on physiology differences among varieties in the leaves and filling, the experiments was carried out . Methods: The photosynthesis rate and the enzyme activities in metabolisms of the energy and substances of the flag leaf and grain filling for Liang You Pei Jiu, Shan you 63 and 9311 at the late developmental stage were studied. Results: The results shown that changes tend of every physiological characteristics are at same for vigorous grain of three species, the Liang You Pei Jiu had advantages in the physiological activity at early filling stage and filling of vigorous grain. The physiological activity declined gradually during early and middle filling stage, the net photosynthetic rate of flag leaf declined fairly especial the physiological activity of week grain was more than other two species. Comparing with other two species, the changes of that ATPase activity GDH activity, sucrose synthetase activity, contents of soluble sugar and starch in leaf and grain were notable. The set up time of filling in week grain was slowly, in proper order, they are 9311,Shan you 63 and Liang You Pei Jiu from curve. Comparing with vigorous grain, the energy and substances in the week grain was on less. Conclusion: the energy and enzyme that substances synthetase activity are in lower in leaf and grain of the Liang You Pei Jiu, which are an important reason for high empty-unfilled grain. Therefore, it is an effective way for overcome difficulty that regulation in physiological function and activity of flag leaf and strengthen metabolism of energy of the week grain .