干旱胁迫下新疆野生鸭茅(Dactylis glomerata)苗期抗旱性生理特性  

On the Physiological Characteristic of Drought Resistance of Native Dactylis glomerata in Xinjiang at Seeding Stage

作　　者：赵莉[1] 牟书勇[1] 张鲜花[2] 

机构地区：[1]中国科学院新疆生态与地理研究所,新疆乌鲁木齐830011 [2]新疆农业大学草业与环境科学学院,新疆乌鲁木齐830052

出　　处：《干旱区研究》2015年第5期953-957,共5页Arid Zone Research

基　　金：新疆草地资源与生态实验室项目"天山北坡天然草地鸭茅种群分布特征及形态结构分化的研究"(XJDX0209-2012-05);新疆农业大学草业科学重点学科项目"天山北坡野生鸭茅生态适应性机理研究"(XJCYB-2011-02)资助

摘　　要：采用盆栽试验,对新疆3个地区野生鸭茅材料进行干旱胁迫处理,分别测定了连续干旱4、8、12 d的脯氨酸、可溶性糖和丙二醛3个抗旱生理指标。结果表明:随着干旱胁迫程度的增加,3个地区鸭茅材料的脯氨酸和丙二醛含量呈递增趋势,可溶性糖含量呈先减少后增加的变化趋势;3项生理指标间的相关性分析表明,可溶性糖和丙二醛含量之间存在显著的相关性;通过3项生理指标的比较,3个地区的野生鸭茅材料中,昭苏鸭茅表现出较好的抗旱性。Drought stress affects plant growth and development,often causes serious crops production reduction,for the first place in all of the abiotic stress damage,is one of the major natural disasters leading to forage grass production,animal husbandry production economic loss. A mimic drought stress was designed for 3 Dactylis glomerata in Xinjiang,three drought resistance index of proline,soluble sugar and MDA were determined after drought induced for 4,8,and 12 days. The results indicate： with aggravation of drought stress,the proline and MDA were increasing,while the soluble sugar initial declined,then increased. Relevant analysis results showed the relationships were significantly positive between soluble sugar and MDA and the correlation coefficient is 0. 664. Although there was correlation among Proline and soluble sugar and malondialdehyde,but no significant correlation,the correlation coefficient was 0. 071 and 0. 389,respectively. It is thus clear that in the drought stress environment,three physiological indexes have different accumulation process,proline accumulation first,after the proline accumulation to a certain extent,a large number of accumulations of soluble sugar and malondialdehyde are following. Through the comparison of three physiological indexes,the Dactylis glomerata in Zhaosu showed better drought resistance of three areas.Drought resistance of Dactylis glomerata is a complex physiological process,has close relations with its varieties,survival environment. How to better evaluate the drought resistance and its mechanism of Dactylis glomerata,it is necessary to conduct an in-depth research.

关 键 词：干旱胁迫 鸭茅(Dactylis glomerata) 生理特性 抗旱性 

分 类 号：S543.3[农业科学—作物学]