干旱地区农业研究Issue(6)：172-177,6.DOI:10.7606/j.issn.1000-7601.2015.06.29
基于生理指标确定河套灌区玉米春霜冻的气象指标
Determining the meteorological indexes of spring frost in Hetao irrigation district based on physiological indexes of maize
摘要
Abstract
Frost is one of the agricultural meteorological disasters occurred frequently in Hetao irrigation district. We used Kehe No.8 maize,a mid-late maturing variety widely planted in Hetao irrigation area,as the test material.5℃to -5℃ low temperature environment was set up,allowing the treatments of maize seedlings for 1 h,3 h,and 5 h. Comparisons between the physiological index changes before and after treatments were analyzed.Physiology research un-der stress could result in insightful understandings of the physiological and biochemical changes in plants under various low temperature treatments,which could be used to determine the meteorological indexes of spring frost.The results showed that with the decrease of temperature and increase of time under low temperature treatment,chlorophyll content of maize seedlings showed a steady downward trend.While,soluble sugar content,SOD activity and MDA content became increased first and then went decreased,and the highest value appeared at -2℃ and -3℃.The analyses of these three physiological indexes showed that the cold resistance capability of the 4 -leaf maize seedling was stronger than that of the 3 -leaf one.Soluble protein content was decreased first and then became increased,and the lowest value appeared at -2℃.All the low temperature treatments resulted in decreasing of net photosynthetic rate,stomatal conductance and leaf water use rate of maize seedling.According to the results and the supercooling points of maize,the minimum temper-ature indexes of spring frost in Hetao irrigation district were as follows:light frost,0℃ ~3℃;moderate frost,-2.5℃~0℃ and heavy frost,<-2.5℃.关键词
霜冻/低温胁迫/玉米幼苗/生理指标/光合作用/气象指标/河套灌区Key words
frost/low temperature treatment/maize seedlings/physiological indexes/photosynthesis/meteorologi-cal indexes/hetao irrigation district分类
农业科技引用本文复制引用
王海梅,侯琼,杨钦宇,韩经纬,金迎春..基于生理指标确定河套灌区玉米春霜冻的气象指标[J].干旱地区农业研究,2015,(6):172-177,6.基金项目
公益性行业（气象）科研专项 （）
