苹果树萌芽期前短时冰冻胁迫对其生长发育的影响OA

Zhaotong Red Fuji apple trees were used as the experimental material.By comparative experiment,the tolerance of apple trees to short-term low-temperature stress(-2℃ to-8℃)before the germination stage was explored,aiming to improve the tolerance of Red Fuji apple trees to the damage caused by'late spring cold snaps' through short-term freezing stress treatment.Through measuring growth indicators including the germination rate,leaf area,photosynthetic rate,leaf shape index,shoot growth rate,as well as the survival rate of both the fruit trees and their branches,the effect of low-temperature stress on apple trees was analyzed.The results showed that the treatment group got a 100％survival rate for both the trees and their shoots,while the control group achieved survival rates of 97.6％and 98.64％for the trees and shoots,respectively.The germination rate of the treatment trees was 4.16％lower than that of the control in the early stage,while the leaf growth rate was significantly superior to that of thecontrol,with the average leaf area of the treatment group increasedoy 633.84 mm2 compared with the control,the photosynthetic rate improved by 1.4 μmol·m-2·s-1,and no significant difference was observed in the leaf shape index.Taken together,the short-term(15 h)low-temperature(-2℃ to-8℃)freezing stress before the germination stage could improveo cold resistanceof the apple trees,without affecting their survival rate,and has a positive promoting effect on the growth and development of branches and leavesof trees.