水稻主茎功能叶光合特性的研究

水稻主茎功能叶的净光合速率呈有规律的双峰曲线变化,不同熟期品种第一峰值的出现时期不同但第二峰值均出现在抽穗期,两峰之间的低谷在减数分裂期。不同品种之间净光合速率大小及特性差异显著。叶片的净光合速率与单位面积氮、钾含量呈极显著及显著的正相关。水稻单叶光合量大小是随出叶顺序而递增的,叶面积的大小对光合产物的贡献起主要作用。

STUDY ON THE PHOTOSYNTHETIC CHARACTERS OF THE FUNCTIONAL LEAVES ON THE MAIN STEMS OF RICE

The net pholosynthetic rate of the functional leaves on the main stems of rice showed a regular curve with two clear peaks. The time of the first one varied with the different sien type varieties, but that of the second one of all varieties showed at heading stage. The valley between the two peaks was at meiosis stage. The net photosynthetic rates and characters of rice were significantly different among the varieties. The net photosynthetic rate of leaves was found to be signifi cant and top significant positive correlations with the contents of nitrogen and potassium respectively. The photosynthetic rate per leaf was increased in order of leafing out. The leaf area played a main part in the contribution to the photosynthetic produsts.