摘要： 以禾本科主要作物小麦、水稻、玉米为材料,研究内源激素IAA和CTK在其生育初期的含量及可能的生理作用。结果表明:在作物分蘖过程中,小麦和水稻内源激素IAA和CTK变化趋势相似,呈单峰曲线;玉米生育初期,内源CTK含量变化呈单峰曲线,IAA含量则持续下降。3种作物的IAA/CTK值呈先下降后上升的变化趋势。小麦、水稻单株分蘖数在IAA/CTK值较高或呈上升趋势时增长缓慢,而在IAA/CTK值较低或该比值呈下降趋势时增长迅速。所以认为,水稻和小麦分蘖能力与内源激素IAA和CTK的含量有关,尤其与两者之间的比值高低及其变化趋势密切相关。由此推测,玉米高度抑制、生态上不出现蘖芽可能与玉米的IAA/CTK值变化幅度较小或该值相对较高有关。

关键词: 禾本科, 主要作物, 分蘖, IAA, CTK

Abstract: Research on the relationship between endogenous hormones and tiller activity of main crops of Gramineae was done over two seasons( 1999-2001). The results were as following: The same changes of en- dogenous IAA and CTK contents rose early and then droped, were presented in the tiller process of winter wheat and rice at the early growing stage of maize. Yet, the value of IAA/ CTK descended at the early stage of tiller process, and then ascended at the late stage. At the same time, the number of weekly tiller increment per plant rose quickly early, and then drop late. So, wheat and rice tiller activity was noticeably regulated by the content of IAA and CTK, especially the value of IAA/ CT K. It could be improved or inhibited by a low or high value of IAA/ CTK respectively. It was also found that the dynamic of IAA/ CTK played a rather important role in the early growing stage of maize.

Key words: Gramineae, Main crops, Tiller, IAA, CTK

中图分类号: 

• S512.101