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为了研究外源ABA对茶树抗寒性的影响,用不同浓度的ABA喷施茶树枝条,根据叶片可溶性糖含量的变化确定适宜的浓度,再用最适浓度的ABA喷施茶树枝条,测定经低温胁迫后抗寒生理指标可溶性糖、丙二醛含量及相对电导率的变化。结果表明:50mg/L和250mg/LABA喷施茶树枝条对叶片可溶性糖含量影响最显著,但50mg/L较为适宜。-8℃低温处理48h后,ABA喷施的叶片可溶性糖含量高于对照40.13%,丙二醛含量低于对照10.42%。实验表明一定浓度的外源ABA可在一定程度上缓解茶树叶片的低温伤害,增强茶树抗寒性。
In order to study the effect of exogenous ABA on the cold resistance of tea plant, shoots of tea plants were sprayed with different concentrations of ABA, the appropriate concentration was determined according to the change of soluble sugar content in leaves, and the tea plant branches were sprayed with ABA at the optimum concentration, Changes of Soluble Sugar, Malondialdehyde Content and Relative Electrical Conductivity of Physiological Index of Cold Hardiness after Cold Stress. The results showed that the effects of spraying 50mg / L and 250mg / L LABA on the soluble sugar content of leaves were the most significant, but 50mg / L was more suitable. After 48 h treatment at -8 ℃, the content of soluble sugar in leaves sprayed with ABA was 40.13% higher than that of the control and the content of malondialdehyde was 10.42% lower than the control. Experiments show that a certain concentration of exogenous ABA can alleviate the tea tree leaf damage to a certain extent, enhance tea cold resistance.