摘要
根据叶片温度可以反映植物体内水分状况及气孔运动等一系列生理变化的特征,研究干旱胁迫下高粱叶片温度与水分状况变化间的关系,分析高粱抗旱反应机制。采用4个不同抗旱性高粱品种,在盆栽条件下,分别在拔节期、开花期和灌浆期进行干旱胁迫,以正常灌水为对照,胁迫7 d后测定高粱叶片自由水含量、离体叶片失水速率、相对含水量等水分状况,利用远红外热成像仪测定叶片温度变化。结果表明,干旱胁迫下,高粱叶片自由水含量、束缚水含量、相对含水量和离体叶片失水速率等水分状况在不同生育时期均呈下降趋势,吉杂305(高度抗旱品种)的下降幅度显著小于吉杂127(高度干旱敏感品种)(P<0.05),锦杂106(中等抗旱品种)和锦杂103(干旱敏感品种)介于二者之间。叶温差与自由水含量和相对含水量显著相关(P<0.05),与束缚水含量极显著相关(P<0.01)。叶片温度变化可以反映高粱叶片的水分状况,叶温差可以作为高粱抗旱性筛选的一个重要指标,应用远红外热成像技术在高粱抗旱性的鉴定上具有可行性。
Based on the theory that leaf temperature could reflect the physiological characteristics such as water sta-tus and stomata movement in plants under drought stress,the relationship between leaf temperature and moisture condition in sorghum was studied for analyzing its response mechanism to drought resistance .With 4 sorghum varieties with differ-ent drought-resistance as the test materials under pot cultivation,drought stress treatments were conducted at jointing stage,flowering stage and filling stage,respectively,with normal irrigation as control .Leaf free water content,water loss rate of cutting leaves and leaf relative water content were measured,and leaf temperature changes were recorded by in-frared thermal imager after 7 days of drought stress .The results indicated that,under drought stress,the leaf water pa-rameters such as free water content,bound water content,relative water content and water loss rate of cutting leaves showed a declining trend at different growth stages of sorghum .The above parameters of Jiza305 （highly drought-resistant variety）decreased significantly less than those of Jiza127 （highly drought-sensitive variety）,while Jinza106 （medium drought-resistant variety）and Jinza103 （drought-sensitive variety）performed in-between .Leaf temperature difference was positively related with free water content and relative water content （P〈0 .05）and negatively with bound water content （P〈0 .01）.Leaf temperature changes can reflect leaf water status,and leaf temperature difference can serve as an im-portant indicator for screening of drought resistance in sorghum .Therefore,it is feasible to apply infrared thermal imager technology for screening of drought resistance in sorghum .
出处
《干旱地区农业研究》
CSCD
北大核心
2013年第6期146-151,共6页
Agricultural Research in the Arid Areas
基金
农业部现代农业产业技术体系建设专项资金(CAR-06-02-02)
关键词
高粱
干旱胁迫
叶片温度
叶温差
水分状况
sorghum
drought stress
leaf temperature
leaf temperature difference
water status
