高温胁迫对孔雀草和万寿菊不同品种生长和生理的影响  

Effects of Heat Stress on Growth and Physiology of Marigold Cultivars

作　　者：田治国[1] 王飞[2] 张文娥[2,3] 赵秀明[2] 

机构地区：[1]西北农林科技大学林学院,陕西杨凌712100 [2]西北农林科技大学园艺学院,陕西杨凌712100 [3]贵州大学农学院,贵阳550025

出　　处：《园艺学报》2011年第10期1947-1954,共8页Acta Horticulturae Sinica

基　　金：国家林业局社会公益项目(200704009);陕西省农业科技攻关项目(2009K01-11)

摘　　要：以万寿菊属(Tagetes)的6个孔雀草品种和3个万寿菊品种为试材,研究了38℃/21℃(昼/夜)高温胁迫对其株高、根长、根数、干样质量、热害指数以及叶绿素[Chl.(a+b)]含量、叶片相对电导率(REC)、丙二醛(MDA)含量、叶片相对含水量(RWC)、抗氧化酶(SOD、POD、CAT、APX)活性等指标的影响。结果表明:持续4d的高温胁迫下,9个品种叶片、株高等形态表现出不同的受害症状。REC和MDA明显上升,叶片叶绿素含量和相对含水量均明显下降。同时高温胁迫提高了SOD、POD和CAT酶的活性,降低了APX酶的活性。叶片相对电导率与热害指数之间呈极显著正相关(P<0.01);SOD、POD和CAT与热害指数之间均呈极显著负相关(P<0.01)。9个品种耐热性可评定为:‘发现’、‘拳王’、‘巨人’和‘金门’耐热性强;‘大英雄’和‘珍妮’次之;‘迪阿哥’、‘小英雄’和‘鸿运’耐热性差。The effects of high temperature 3 8 ℃/21 ℃ （day/night） on plant growth, leaf chlorophyll content, relative electric conductivity （REC）, malon dialdehyde （MDA） content, relative water content （RWC）, the activities of superoxide dismutase （ SOD ）, peroxidase （ POD ）, catalase （ CAT ） and ascorbate peroxidase （APX） were investigated in 9 marigold cultivars. The results showed that 9 cultivar seedlings showed different degrees of damage symptom under high temperature for 4 days. MDA contents and REC increased significantly, whereas leaf chlorophyll content, RWC and APX decreased under high temperature treatment, which also increased SOD, POD and CAT activities. The path coefficient analysis showed a significantly positive correlation between REC and heat injury index, but significantly negative correlations between SOD, POD and CAT activities and heat injury index. The heat tolerance of the tested 9 cultivars decreased in the order of ＇Discovery＇, ＇Chokdee＇, ＇Giant＇, ＇Gate Gold＇, ＇Great Hero＇, ＇Janie＇, ＇Durango＇, ＇Little Hero＇ and ＇Bonanza＇.

关 键 词：孔雀草 万寿菊 品种 高温胁迫 耐热性 抗氧化酶 

分 类 号：S681[农业科学—观赏园艺]