植物内源激素对小麦叶片衰老的调控机理研究

对小麦灌浆期不同叶位叶片的５大类激素含量测定结果表明，正在衰老叶片的乙烯和脱落酸（ＡＢＡ）含量明显增加，前期和中期的功能期叶片细胞分裂素（玉米素和玉米素核苷，Ｚ＋ＺＲ）和赤霉素（ＧＡ３）含量较高，生长素（ＩＡＡ）在功能期和后期衰老的叶片中含量较高。因此可以将这４种激素分为２大类，即乙烯和ＡＢＡ诱发和促进叶片衰老，另一类的Ｚ＋ＺＲ和ＧＡ３则维持叶片功能，抑制衰老。但ＩＡＡ表现了具有前期保持叶片生长发育和后期促进衰老的双重作用，在不同叶片中，春６叶（旗叶）则比较复杂。旗叶与睛相比表现了特殊性，这可能与其特殊的功能有关。

Research on Phyto-hormones Regulating Mechanism of the Senescence of Wheat Leaves

Contents of five kinds of phytohormones in different leaves were tested during filling period. The results showed that the contents of ethylene and ABA in the senescing leaves increased obviously, the contents of Z ZR and GA 3 in the effective leaves also got higher during the initial and middle filling periods, but the flag leaf showed complex. Therefore, the phytohormones can be divided into two parts, one was ABA and ethylene that induced and prompted senesce, and the other parts was GA 3 and Z ZR that maintained the functional leaves and inhibited senesce. IAA showed double functions that maintained growth in the earlier filling period, and that promoted the senescing period in the later filling period. In addition, flag leaf was very special, perhaps due to its important function.