基于双向温度梯度系统的槟榔萌发及生理响应

Germination and Physiological Response of Areca catechu L. to Temperature Differentials on the 2-way Grant’s Thermogradient Plate

本研究以‘热研1号’槟榔种子为供试材料,借助双向温度梯度系统控制面板设置49个昼夜温度处理(最高温区48℃,最低温区20℃),研究其对种子萌发率、生长状况及生理响应的影响。结果表明:槟榔种子萌发最佳昼夜温度组合为29/25℃,萌发率100%,生长态势最佳;20/20℃条件下槟榔种子有萌发,但发芽率为80%,种子长势一般;48/48℃条件下种子不萌发。根据长势状况,以及酶活(SOD、POD、GR)测定,明确了最适于种子萌发及生长的温度范围为25/20~34/25℃。另外种子萌发所需日积温560~744℃·h为宜,萌发总积温不宜超过24 864℃·h。实验还证实了槟榔种子变温处理比常温萌发效果更好。

The effect of germination rate, growth conditions, physiological response of Arecanut was studied using the2-way grant’s thermogradient plate which allows 49 temperature combinations(regimes)(20 ℃ to 48 ℃) of single temperature and alternating temperature combination over a time continuum. Under the best temperature combination29/25 ℃, the seed germination rate was 100% and the growth potential was the best. When temperature was 20/20 ℃,the germination rate was 80%, and the growth was general. The 48/48 ℃ treatment did not have any effect. According to the germination rate, growth conditions and physiological response(SOD, POD, GR), the most suitable temperature range was 25/20-34/25 ℃. In addition, the optimum reaction accumulated temperature was 560-744 ℃·h, and the total germination temperature should not exceed 24 864 ℃·h. The experiment also supported that the alternate temperature treatment was better than the normal temperature treatment for the seed germination rate and growth of Arecanut.