赤霉素对两种高山杜鹃种子发芽的影响

Effect of GA on Two Species Alpine Rhododendron Seeds Germination

研究了不同浓度赤霉素在不同处理时间条件下对九龙山杜鹃(R.jiulongshanense)和桃叶杜鹃(R.annae)种子发芽的影响。结果表明:在0～300mg/LGA浓度范围内,浸种15min的发芽势和发芽率均较对照有不同程度的提高,200mg/L浓度时增加最多,300mg/L较200mg/L时有所降低。在相同浓度范围内,浸种30min的发芽势、发芽率反而较对照明显降低。因此两种杜鹃种子对GA处理促进或者抑制发芽呈现明显的时间敏感性。本试验以200mg/L浸种15min的效果最好,桃叶杜鹃的发芽势、发芽率分别为40.00%、64.33%,与对照差异达到了显著水平。

Effect of gibberellic （GA） in different concentration and different treating time on germination of Rhododendron jiulongshanense and R.annae seed were studied.The results indicated that germination energy and germination rate could be increased by soaking seed in 0-300mg/L GA for 15minutes,and was up to the highest at 200mg/L,but lower than that of 200mg/L when GA concentration was 300mg/L.While in the same range of concentration,germination energy and germination rate decreased when seeds were soaked for 30minutes.So the effect of GA processing on two species of Alpine Rhododendron was quite different in soaking time.In this study,seed germination was the best with GA 200g/L and soaked 15minutes,R.annae germination energy and germination rate were 40.00% and 64.33% respectively,increased by 27.67% and 36.00% compared with the control,and the difference was significant.