低温胁迫对竹柏生理生化特征的影响(英文)

目的]研究低温胁迫对竹柏生理生化特征的影响。方法]通过测定竹柏幼苗叶片质膜相对透性、游离脯氨酸含量、可溶性糖含量、丙二醛(MDA)含量和叶绿素含量等生理指标,研究竹柏幼苗在自然条件下和人控低温条件下这些生理指标连续5d的变化规律。结果]竹柏幼苗叶片可溶性糖含量、游离脯氨酸含量、丙二醛含量和质膜相对透性均较对照有所上升;叶绿素含量随着低温胁迫时间的延长逐渐下降。竹柏幼苗对低温胁迫产生了积极的响应,所受的低温伤害有所降低。结论]该研究为竹柏在汉江平原地区种植的冬季管理提供理论依据。

Effects of Low Temperature Stress on Physiological and Biochemical Characteristics of Podocarpus nagi

Objective] The paper was to study the effect of low temperature stress on physiological and biochemical characteristics of Podocarpus nagi.Method] Through the determination of physiological indices such as plasma membrane permeability,free proline content,soluble sugar content,malondialdehyde(MDA) content and chlorophyll content,the change law of these indices of P.nagi seedlings under natural conditions and artificially controlled low temperature conditions within the continuous 5 d was studied.Result] The soluble sugar content,free proline content,MDA content and plasma membrane permeability of P.nagi seedlings were slightly increased compared with control;the chlorophyll content gradually decreased with the prolongation of low temperature stress.P.nagi seedlings produced active response to low temperature stress,so the low temperature injury P.nagi seedlings suffered was reduced.Conclusion] The study provided theoretical basis for winter management in P.nagi cultivation in Hanjiang plain area.