９０－０９是由ＧＡ３、４ｐｕ－３０和硼等微量元素组成的复配剂，于杂交水稻抽穗期喷施，能有效延缓叶片衰老期间叶绿素的降解，使叶片衰老进程减缓，促进水稻增产。研究其对叶片（衰老期间）内源激素、蛋白质和核酸含量影响的结果表明，９０－０９能显著地减缓叶片衰老期间内源ＡＢＡ的增加和内源ＺＲｓ、ＧＡｓ及ＩＡＡ的减少；同时也减缓了血红蛋白水解酶和ＲＮａｓｅ比活的上升，及蛋白质和核酸的降解。由此可见，９０－０９能有效延缓杂交水稻叶片衰老，与其使同期叶片维持较高水平的蛋白质和核酸密切相关。这可能是其调节多种内源激素水平的作用 90-09 is a complexing agent consisting of GA3, 4Pu-30 and boron and other trace elements sprayed at the heading stage of hybrid rice can effectively delay the degradation of chlorophyll during leaf senescence, slow down the senescence process of leaves and promote rice yield. Studying the effect of 90-09 on the content of endogenous hormones, proteins and nucleic acids in leaves (aging) showed that 90-09 could significantly reduce the increase of endogenous ABA and the decrease of endogenous ZRs, GAs and IAA during leaf senescence, but also slow down Increased specific activities of hemoglobin and RNase, and degradation of proteins and nucleic acids. Thus, 90-09 can effectively delay the leaf senescence in hybrid rice, which is closely related to maintaining high levels of protein and nucleic acid during the same period. This may be its role in regulating a variety of endogenous hormone levels