Abstract: Soaking seed and spraying rice seedling with uniconazol both can regulate rice seedling growth efficiently, and lower the plant height and increase the number of tillers as the result. In the same methods, to apply triadimefon also can be partly effective. Furthermore, when the mixture of uniconazol and triadimefon were applied together in this way, the control over the seedling height and the increase in the number of tillers were significant by comparison. At the same time, the endogenous hormones in rice seedling which have been applied uniconazol changed obviously in contrast with control. The content of GA S and IAA has decreased markedly, and the content of iPAs and ABA has increased obviously. In this experiment, the triadimefon has no efficient effects on seedling endogenous hormones, but the cooperative effects of uniconazol and triadimefon on endogenous hormones have been strengthened significantly compared with the single treatment of uniconazol or triadimefon. In the light of the relationship between the cooperative regulation of uniconazol or uniconazol and triadimefon on the growth of rice seedling and the changes of the endogenous hormones, It is concluded that the significant decrease of the content of GA_S and IAA and increase of the amount of iPAs and ABA were the mechanism of the cooperative regulation of uniconazol or uniconazol and triadimefon on the growth of rice seedling.

Key words: uniconazol, triadimefon, endogenous hormone, rice, seedling

摘要： 用烯效唑、三唑酮和烯效唑+ 三唑酮浸种或苗期喷施的结果表明, 烯效唑能有效地调节水稻秧苗的生长, 使苗高降低、分蘖增加。三唑酮对水稻秧苗的生长也有一定的调节作用。烯效唑和三唑酮协同调节秧苗生长, 控制苗高和促进分蘖有明显的增效作用。与此同时, 烯效唑和烯效唑+ 三唑酮协同作用使内源激素水平发生明显变化, GA_S 和IAA 含量明显降低,iPA s和ABA 含量显著增加。根据烯效唑和烯效唑+ 三唑酮协同作用调节水稻秧苗生长与内源激素水平变化的关系, 明确使内源GA_S、IAA 含量降低和iPA s、ABA 含量增加是烯效唑和烯效唑+ 三唑酮协同调节水稻秧苗生长的主要机理。

关键词: 烯效唑, 三唑酮, 内源激素, 水稻, 秧苗