不同品种水稻种子萌发速率的差异及其对外源植物激素的响应

Differences in Germination Rate Among Different Varieties of Rice Seeds and Their Responses to Exogenous Phytohormones

研究了5个来自不同产地的不同品种的水稻种子在相同条件下的萌发进程,从中选择萌发最快(临籼21)和最慢(稻花香2号)的2个品种的种子作为进一步试验的材料,测试并对比它们萌发时对外源GA_3、乙烯利和ABA的响应。结果显示,GA_3和乙烯利对2个品种的水稻种子的萌发均有显著的促进作用,而ABA则有显著的抑制作用,且这种促进或抑制作用具有浓度依赖性和品种依赖性;萌发快速的临籼21水稻种子对GA_3和乙烯利的促进作用相对敏感,对ABA的抑制作用相对不敏感,而萌发相对较慢的稻花香2号水稻种子则恰好相反。这些试验结果似乎暗示着2个品种的水稻种子之所以萌发速率不同,或许是因为它们具有不同的内源植物激素组成比例。

Five different varieties of rice seeds were submitted to a germination test under the same temperature and light conditions, and then the fastest （Linxian No. 21） and slowest （Daohuaxiang No.2） varieties in germination rate were used as experimental materials to test and compare their ger- mination responses on exogenous GA3, ABA and ethephon.The results showed that the germination of two varieties of rice seeds was significantly promoted by GA3 and ethephon and significantly inhibited by ABA,and the roles of promotion and inhibition were concentration-dependent and variety-depend- ent.Nevertheless,the rapidly germinative Linxian No.21 rice seeds were relatively sensitive to GA3 and ethephon and relatively insensitive to ABA,while that of the relatively slow germinative Daohuaxiang No.2 rice seeds were contrary to Linxian No. 21 rice seeds. These results seemed to imply why the germination rate of two varieties of rice seeds was different, there were different endogenous phvtohormone ratios in them.