Abstract
In order to select severe overwintering abilitied blueberry cultivars for cold resistance of annual branches, promoting breeding high quality cultivars, a study had been conducted into field-planting shoots overwintering ability and the relative conductivity, MDA content, SOD of 7 different kinds of blueberries under artificial cooling process. According to survey results, under field conditions, Different cultivars of blueberries showed significantly difference, ranging from 56.67% of Bluegold to 12.80% of Darrow. With the temperature decreasing, changes of relative conductivity, MDA content and SOD in annual branches had a strong regularity and the hardiness of these cultivars is: Northland > Chippewa > Coville > Bluecroup > Darrow > Bluegold > Powderblue.
Highlights
In order to select severe overwintering abilitied blueberry cultivars for cold resistance of annual branches, promoting breeding high quality cultivars, a study had been conducted into field-planting shoots overwintering ability and the relative conductivity, MDA content, SOD of 7 different kinds of blueberries under artificial cooling process
Overwintering of blueberry is closely related to such factors as low winter temperature and physiological drought in early spring, and its overwintering ability shows a wide range of differences attributed to many kinds of natural climate conditions and artificial cultivation measures; even in the same type of climate, there are significant differences between different cultivars
Most domestic cultivars belong to the North American cultivar; the main cultivation areas in China’s Shandong peninsula and America, the climates are still significantly different, especially part of introduced cultivars cannot adapt well to the low winter temperature of Shandong peninsula
Summary
Overwintering of blueberry is closely related to such factors as low winter temperature and physiological drought in early spring, and its overwintering ability shows a wide range of differences attributed to many kinds of natural climate conditions and artificial cultivation measures; even in the same type of climate, there are significant differences between different cultivars. Most domestic cultivars belong to the North American cultivar; the main cultivation areas in China’s Shandong peninsula and America, the climates are still significantly different, especially part of introduced cultivars cannot adapt well to the low winter temperature of Shandong peninsula. For this purpose, this study is designed and finished to make an analysis on cold resistance of main 7 cultivars of blueberries in Iiaonan area, Qingdao so that it can lay a foundation for further cultivation and breeding and provide theoretical basis for sustainable and healthy development of blueberry
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