抗寒锻炼期果园气温对库尔勒香梨不同越冬期抗寒性的影响

Effect of Orchard Temperature on Cold Resistance of Korla Fragrant Pear during Cold Hardening Period

为了解释抗寒锻炼期果园气温变化对库尔勒香梨不同越冬期抗寒性的影响,连续测定了2年不同越冬期间库尔勒香梨树干阳阴面形成层、一年生枝条和花芽等器官和组织的SOD、CAT、POD酶活性、可溶性蛋白含量、相对电导率、果园气温等生理指标和环境因子;采用隶属函数综合评价2年不同越冬期抗寒性,分析抗寒锻炼期气温与不同越冬期抗寒性变化之间的关系。抗寒锻炼期间气温变化一定程度上影响不同越冬期库尔勒香梨表现出的抗寒性,抗寒锻炼期气温波动性小的年份不同越冬期表现出的抗寒性强于气温波动性大的年份;不同生理指标与气温均呈负相关,其中气温与保护酶呈极显著性负相关,生理指标中可溶性蛋白和POD对库尔勒香梨抗寒性的贡献率比其它生理指标大;总体上库尔勒香梨属于抗寒性品种。

To explain the effect of temperature changes during cold resistance period on the cold hardiness of Korla fragrant pear＇ s different over-wintering period, the SOD, CAT, POD activity, soluble protein content, relative conductivity of Korla Fragrant Pear＇ s trunk cambium, annual branch and bud for two years were continuously determined, and the air temperature of the orchard were simultaneously measured; Its cold resistance of different over-wintering period by using fuzzy mathematics method was evaluated, and the relation between air temperature changes and its cold resistance over the winter were analyzed. The result showed that the air temperature changes of the cold hardening period affected the cold resistance of Korla fragrant pear during different wintering periods, the year which had the smaller temperature fluctuation range during the cold hardening period expressed stronger cold resistance than the year which had the bigger temperature fluctuation range; Different physiological indexes were negatively correlated with air temperature changes, of which air temperature was very negatively correla- ted with anti-oxidant enzymes, and the POD and soluble protein content had the biggest contribution rate for the cold resistance ; Overall Kor- la fragrant pear belonged to cold resistance varieties.