内源激素对小麦叶片衰老调控的系统分析

以小麦京冬号幼苗第一真叶为材料，根据系统论原理，对叶片衰老的内源激素调控进行了系统分析，结果表明：（１）各种激素与叶绿素含量显著相关，且激素间有一定相关，激素是以系统的方式调控叶片衰老的。（２）玉米素（Ｚ），赤霉酸（ＧＡ３）脱落酸（ＡＢＡ）对叶片衰老有直接作用，乙烯（ＥＴＨ）生长素（ＩＡＡ），异戊烯基腺嘌呤及其核苷（ｉＰ＋ｉＰＡ）二氢玉米素及其核苷（ＤＨＺ＋ＤＨＺＲ）是通过影响ＡＢＡ，ＧＡ３和Ｚ间

Systematical Analysis of Hormones Regulation on Wheat Leaves Senescence

Hormone regulation of leaf senescence were systematically analyzed by means of statistics based on the principles of system theory, using Triticum asetivum L. cv. Jingdong 6 as materals. First, leaf senescence was proved to be regulated by hormones in systematic patten. Second,the hierarhy of hormone system were analyzed, Zeatin(Z), Giberilins(GA3) and Ab- scisic acid (ABA) regulated leaf senescence directly. The other four (iP iPA, DHZ DHZR, IAA and ETH) affected senescence indirectly by adjusting ABA, GA3 and Z. Third, the paths of hormones regulating senescence were deciphered by means of hormone systems. Zeatins regu lated senesence directly or indrectly through increasing GA3 level or decreasing ABA level. GA3 delayed leaf senescence and increasing GA3 level. ABA enhanced leaf senescence directly while counteract the effect of Zeatin. ETH and other hormones affected senescence by several different paths which including enhancement and inhibition, the final effects of them was determined by the accomplishment of the various paths.