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园艺学报 ›› 2011, Vol. 38 ›› Issue (10): 1947-1954.

• 观赏植物 • 上一篇    下一篇

高温胁迫对孔雀草和万寿菊不同品种生长和生理的影响

田治国1,王 飞2,*,张文娥2,3,赵秀明2   

  1. (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)
  • 收稿日期:2011-07-07 修回日期:2011-09-14 出版日期:2011-10-25 发布日期:2011-10-25
  • 通讯作者: 王 飞2,*,

Effects of Heat Stress on Growth and Physiology of Marigold Cultivars

TIAN Zhi-guo1,WANG Fei2,*,ZHANG Wen-e 2,3,and ZHAO Xiu-ming2   

  1. 1College of Forestry,Northwest A & F University,Yangling,Shaanxi 712100,China;2College of Horticulture,Northwest A & F University,Yangling,Shaanxi 712100,China;3Agricultural College,Guizhou University,Guiyang 550025,China
  • Received:2011-07-07 Revised:2011-09-14 Online:2011-10-25 Published:2011-10-25
  • Contact: WANG Fei2,*,

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4 d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。

关键词: 孔雀草, 万寿菊, 品种, 高温胁迫, 耐热性, 抗氧化酶

Abstract: The effects of high temperature 38 ℃/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’.

Key words: french marigold, marigold, cultivar, heat stress, heat tolerance, antioxidant enzyme

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