槟榔不同品种幼苗耐寒性比较初步研究

通过测定低温胁迫过程中槟榔的叶片相对电导率(REC),结合Logistic方程计算的半致死温度(LT_(50)),评价了不同品种槟榔的耐寒性.结果表明, 在低温胁迫过程中, 4个槟榔品种的相对电导率均随温度的下降而不断上升, 但上升幅度因品种而异.4个品种耐寒性由强到弱排序依次为 Tw>Qz >Qh>Ld.槟榔品种低温处理后叶片受伤害程度与电导率测试结果吻合, 表明半致死温度可作为槟榔抗寒性评价的一个重要指标.结合海南30年的温度气象资料,认为海南的气温适合槟榔的生长,冬季不同月份极端低温危害也不容忽视.该试验结果可以为抗寒槟榔种质筛选和槟榔抗寒性机理的深入研究提供理论依据.

Preliminary Study on Cold-tolerance of Areca catectu L. Seedling Leaves

The relative electric conductivity(REC)of areca-nut leave under different temperature stress was determined in this paper combined with logistic equations and semi-lethal temperature (LT_(50) ) and the cold tolerance were evaluated.The result showed that the relative electric conductivity were increased as the temperature decreased with different degree for different ecological population. The order of cold resistance ability of four ecological population were listed as follows: Tw >Qz >Qh>Ld. The order of damaged degrees of leaf was in agreement with the experimental results of REC, which indicated that semi-lethal temperature could be used as reliable index for evaluating cold resistance. According to meteorological data from Hainan were over past 30 years, the temperature in Hainan were suitable for areca-nut growth but the damage of extremely low-temperature weather also became an inevitable problem. These results provide value information to select cold tolerance germplasm and furtherly study the mechanism of cold tolerance.