PP_（333）对小麦苗期矮化与抗衰效应的内源激素解析

AN ANALYSIS OF HORMONE-BALANCE TO EFFECTS OF PP_(333):DWARFING AND DELAYING SENESCENCE OF LEAVES IN WHEAT SEEDLINGS

用５ｍｇ／ＬＰＰ（３３３）浸种可使麦苗呈现矮壮的株型并延缓叶片衰老．笔者用酶联免疫法测定苗期各叶内ＧＡｓ、ＩＡＡ、ＡＢＡ、ｉＰＡｓ。ＺＲｓ与ＤＨＺＲｓ含量的动态变化，结果如下：（１）与对照相比，ＰＰ（３３３）使麦叶ＧＡｓ和ＩＡＡ含量持续较低，而ＣＴＫｓ含量则持续较高；伸长期的麦叶ＡＢＡ含量显著较高，衰老期则大幅度降低。（２）ＰＰ（３３３）一方面使伸长期各叶的ＧＡｓ／ＡＢＡ或（ＧＡｓ＋ＩＡＡ）／ＡＢＡ比值显著降低，从而使之矮化；另一方面又使各叶衰老前的ＣＴＫｓ／ＡＢＡ比值明显上升，表现为叶片功能期的延长。

It has been shown that dwarfing and delaying senescence of wheat seedlings can be elicited by immersing the seeds in a solution containing PP333 at a concentration of 5 mg/L for 16 h (20℃).The dynamic contents of GA(1+3+4+7), IAA,ABA,CTKs(ipAs. Zks and DHZRs) of leaves (1/0,2/0,3/0 and 4/0) were obtained by using 6 kinds of ELISAs. These data are summarized as follows:(1)PP333 elicited a higher level of CTKs and a lower levels of IAA and GAs continously.The free ABA level in each leaf was increased by PP333 significantly only during elongation stage,and then decreased gradually and obviously. (2)PP333 caused a lower ratio of GA/ABA or(GA+IAA)/ABA for each elongating leaf.As a result,the length of each leaf was shortened.On the other hand,due to PP333 treatment,CTKs/ABA ratio in each developed.leaf was raied and leaf senescence retarded obviously.