水稻不同品种的穗发芽及其对外源激素的反应

选择8份早籼稻品种在开花后不同天数取穗子进行保湿培养，观察其抗穗发芽能力的差异。结果显示不同品种之间的抗穗发芽能力存在较大差异；处理以开花后22d左右的穗子保湿培养6d考查穗发芽，就能较好地比较出品种之间的差异。以3种不同浓度的赤霉素(GA3)和脱落酸(ABA)进行溶液培养，30mg／kg的赤霉素有明显促进穗发芽的效果，脱落酸抑制穗发芽的效果在不同品种之间表现出比较大的差异。

Pre-harvest Sprouting and Responses to Exogenous Hormone in Different Rice Varieties

Resistances to pre-harvest sprouting (PHS) in eight different early indica rice varieties were investigated after their panicles were sampled from 16 days after pollination (DAP) onwards and treated in wetting condition. The result indicated that there was great variation in resistance to PHS among the varieties, which could be reasonably reflected by the treatment of 6d panicle-wetting for the panicles of 22 DAP. The exogenous hormone treatments to panicles, applying gibberellin acid (GA 3) and abscisin acid (ABA) solutions in 3 different concentrations, showed that 30 mg/kg concentration of GA3 could obviously promote the panicle germination and that ABA could restrain panicle germination even though the effect varied considerably for the different varieties.