烯效唑浸种对水稻秧苗的壮苗机理研究

Studies on the mechanism for the strong seedling induced by Uniconazole soaking seed of hybrid rice

研究了不同播期下不同浓度烯效唑浸种对水稻秧苗形态、生理生化指标的影响。结果表明,烯效唑各处理使株高降低10 81%～43 85%;分蘖时间提早1～5d,分蘖数增加0 084～5 07个/株;干重根冠比提高2 0%～20 65%,根系活力增加50 23%～74 42%;同时IAA、GA3含量在S1(低温)、S2(适温)播期下降低,在S3(高温)播期下升高,各播期下CTK、ABA含量升高,GA3/ABA、IAA/ABA、(GA3+IAA+CTK)/ABA、GA3/CTK、IAA/CTK比值降低。

The effects of different Uniconazole concentrations (0,10,20,30?mg/L) soaking seed of hybrid rice c.v.Gangyou 22 were studied under different sowing dates(early and optimal and late).The results showed as follows:Uniconazole inhibited shoot growth and significantly decreased seedling height,made rice seedling tiller early and more,and increased ratio of root to shoot.At the same time,it reduced the endogenous IAA and GA3 content of rice seedling under the S1(lowtemperature)and S2 (optimal temperature) sowing dates,but the content of IAA and GA3 were increased under the S3(high temperature).It increased the levels of endogenous CTK and ABA,reduced the values of GA3／ABA,IAA/ABA,(GA3＋IAA＋CTK)/ABA,GA3／CTK and IAA/CTK.