Abstract:

In order to explore the change rules of MDA and soluble sugar content in leaves of Ligustrunlucidum Ait in winter, with the leaves from the tree of different age, different cold resistance as the study materials, MDA and soluble sugar content of leaves were measured in every solar term from the early November, 2011 to the middle of March, 2012, and frozen injury of every sampling tree was investigated in the early April, 2012. The results showed that: change curves of MDA and soluble sugar content in different samples were different. On low-temperature stress, the earlier MDA and soluble sugar content of leaves presented ascendant trend, or the bigger ascensional range was, the poorer cold-resistance of plants was. Cold-resistance shown by MDA and soluble sugar content change in leaves was basically in conformity with the practical frozen situation of the plants, and could be used as the physiological indexes of plant hardiness determination. On low-temperature stress, the differences of cold hardiness among select trees and common trees or frozen trees were due to the differences in physical adjustment ability which was relevant with plant genetic influence, and prevented strengthen trend along with the increase of tree age.