关键词: 叶角, 内源激素, 叶成分, 叶结构

Abstract: The relationship between the leaf angle of different rice varieties and fertilizer treatments and the levels of endogenous zeatin and gibberellin were studied. The results showed that,when the level of endogenous zeatin was lower and gibberellin higher,the leaf angle was larger,and vice versa. This was further proved by an additional experiment applying exogenous zeatin and gibberellin.The leaf angle was also significantly affected by spraying auxin,MET and TIBA.It was also observed that,when the rice plant had higher contents of structural and storage substances in leaves and sheaths,and well-developed mechanical structure in leaves and lamina joints, the leaf angle was decreased,and vice versa. On the basis of the similar effects of endogenous and exogenous hormones, it was concluded that phytohormones affected the leaf angle through changing the contents of structural substances and the mechanical structure.

Key words: Leaf angle, Endogenous hormones, Substances in leaves and sheaths, Structure in leaves and lamina joints