氯化钾对干旱胁迫下马铃薯幼苗抗旱性的影响及其机制研究

孙业民<sup>1; 2</sup>; 张俊莲<sup>1; 3</sup>; 李 真<sup>4</sup>; 李自龙<sup>1; 2</sup>; 李朝周<sup>1; 2</sup>

Effect of potassium chloride on drought resistance of potato seedlings

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DOI：10.7606/j.issn.1000-7601.2014.03.005

Key Words: potato potassium chloride drought stress seedling drought resistance growth and development

Author Name	Affiliation
SUN Ye-min^1，2, ZHANG Jun-lian^1，3, LI Zhen⁴, LI Zi-long^1，2, LI Chao-zhou^1，2	（1.甘肃省作物遗传改良和种质创新重点实验室, 甘肃兰州 730070； 2.甘肃农业大学生命科学技术学院, 甘肃兰州 730070； 3.甘肃农业大学农学院, 甘肃兰州 730070； 4.中国药科大学生命科学技术学院, 江苏南京 210009）

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Abstract:

Effect of potassium chloride (KCl) on drought resistance of potato seedlings were investigated. The results showed that KCl relieved the typical symptom of leaf produced by drought, such as maintaining contents of water, chlorophyll, and MDA and increasing the contents of proline and soluble sugar and the activities of superoxide dismutase (SOD) and catalase(CAT). In addition, it decreased transpiration rate, whereas improved the net photosynthetic rate, water use efficiency and the contents of starch and vitamin C. Plant height, base diameter, stolon number and yield per plant were increased by 6.32%, 18.28%, 13.75%, and 29.45%, respectively, when applying 0.7g KCl/seedling. In su mmary, KCl help to develop effective resistance of potato seedling to drought by improving the water retaining capacity and activating the antioxidative system.