低温弱光盐胁迫对辣椒幼苗生长和生理特性的影响  

Effects of Low Temperature, Weak Light and Salt Stress on Growth and Physiological Characteristics of Pepper Seedling

作　　者：王勤礼[1,2] 许耀照[1,2] 闫芳[1,2] 杨虹天 侯梁宇[1,2] 张文斌 

机构地区：[1]甘肃省高校河西走廊特色资源利用省级重点实验室,甘肃张掖734000 [2]河西学院河西生态与绿洲农业研究院,甘肃张掖734000 [3]河西学院农业与生物技术学院,甘肃张掖734000 [4]张掖市经济作物技术推广站,甘肃张掖734000

出　　处：《中国农学通报》2015年第22期111-114,共4页Chinese Agricultural Science Bulletin

基　　金：甘肃省高校河西走廊特色资源利用省级重点实验室面上项目"荒漠区日光温室有机生态型无土栽培辣椒专用品种选育"(XZ1004)

摘　　要：探讨低温、弱光及盐胁迫三重逆境胁迫下不同辣椒品种生长和生理特性,为日光温室品种选择提供理论依据。以‘陇椒2号’、‘陇椒5号’、‘享椒新冠龙’7叶1心幼苗为试材,采用昼/夜温度为25℃/5℃,光照为8000 lx,昼/夜光周期为8 h/16 h和200μmol/L Na Cl溶液同时处理幼苗15天后,测定了不同品种辣椒幼苗株高、根长、茎粗等生长指标和幼苗SOD活性和MDA含量等生理指标,采用平均隶数函数值法对参试辣椒品种的抗性进行了综合评定。结果表明,处理和对照相比,辣椒株高、根长、茎粗、SOD活性均有不同程度的下降,MDA含量增加;‘陇椒5号’平均隶数函数值最大,其次为‘陇椒2号’,‘享椒新冠龙’最小。低温、弱光及盐胁迫三重逆境胁迫下,辣椒生长和生理指标都有不同程度的变化。‘陇椒5号’和‘陇椒3号’适宜河西地区日光温室长季节栽培,‘享椒新冠龙’适宜早春栽培。In order to provide references for the varieties choice of sunlight greenhouse, the growth andphysiological characteristics of different pepper varieties＇ seedling were studied under low temperature, weaklight and salt stress conditions in this paper. The seedling physiological indexes of MDA content, SOD activityand seedling growth indexes of height, root length and stem diameter on the different varieties of pepperseedling were determined with the 25℃ of day temperature and 5℃ of night temperature, 8000 lx of lightintensity, 8 h of day light cycle and 16 h of night light cycle and pepper varieties seedling of 200 μmol/L Na Clsolution and 15 days in pepper seedling of 7 leaf stage on ‘Longjiao 2＇, ‘Longjiao 5＇ and‘Hengjiaoxinguanlong＇as test materials. The comprehensive evaluation of pepper varieties resistance wasstudied by the method of the average number of subordinate function values. The results showed that,compared with that of CK, plant height, root length, stem diameter, SOD enzyme activity of pepper seedlingdecreased for different degrees. The MDA content increased. The average number of subordinate function valueof‘Longjiao 5＇was the largest, followed by‘Longjiao2＇, and the average number of subordinate function value of‘Hengjiaoxinguanlong＇was the minimum. The growth and physiological indicators of pepper seedlinghad different degrees of change under low temperature and weak light and salt stress conditions.‘Longjiao 5＇and‘Longjiao 3＇were suitable for long season cultivation in Hexi area greenhouse.‘Hengjiaoxinguanlong＇was suitable for early spring greenhouse crop cultivation.

关 键 词：辣椒 三重逆境胁迫 MDA SOD 生长指标 

分 类 号：S641.3[农业科学—蔬菜学]