于１９９７年以２个粳稻和４个籼稻半矮秆品种作材料，对不同矮源苗期对ＧＡ３的反应进行了研究。结果表明：用不同浓度的ＧＡ３溶液处理水稻幼苗，各矮源的苗高都显著增长，与对照相比差异达极显著水平，但具不同矮秆基因的品种对ＧＡ３的反应不同，同样具有ｓｄ１矮秆基因的籼型矮源矮仔粘和粳型矮源黎明对ＧＡ３的反应也不一样，在一定的浓度下，随着ＧＡ３处理时间的延长，各矮源的苗高增长率呈现不同的变化规律；在籼稻品种中，处理４ｄ后，半矮秆基因ｓｄ１对ＧＡ３反应的敏感性强于其它半矮秆基因；在粳稻中，处理７ｄ前，对ＧＡ３反应敏感性强弱顺序为ｓｄ１＞ｓｄｓ（ｔ）。α淀粉酶诱导的研究表明：ＧＡ３对水稻胚乳α淀粉酶的诱导活性与水稻是否具有ｓｄ１基因无关。 In 1997, two japonica rice and four indica semi-dwarf varieties were used as materials to study the response to GA3 in different seedlings. The results showed that with different concentrations of GA3 solution treatment, the seedling height of each dwarf source increased significantly, compared with the control, the difference was extremely significant, but the varieties with different dwarf genes reacted differently to GA3, also had sd The response of GA3 to the dwarfing genes was similar to that of GA3. At a certain concentration, with the prolongation of GA3 treatment, the growth rate of each dwarf source was the highest The results showed that sd1 was more sensitive to GA3 than other semidwarf genes in indica rice cultivars after 4 days of treatment. Before japonica rice was treated for 7 days, its sensitivity to GA3 was stronger The order of sd 1 sd s (t). α-amylase induced studies have shown: GA3 on rice endosperm α-amylase induction activity and rice has no sd  1 gene.