温度胁迫下外引高羊茅活性氧代谢与细胞膜透性的变化  

Study on characteristics of activity oxygen and plasma permeability in leaves of different types tall fescue varieties in different temperature stress

作　　者：郭玉春[1] 余高镜[2] 曾建敏[1] 梁义元[1] 陈芳育[1] 林文雄[1] 

机构地区：[1]福建农林大学作物科学学院,福建福州350002 [2]厦门市公路局,福建厦门361021

出　　处：《草业科学》2003年第2期4-8,共5页Pratacultural Science

基　　金：中美合作项目-中国草坪品种区域试验(CNTVT)子课题"(19971006)

摘　　要：通过聚类分析,将39个美国高羊茅草坪草品种初步分成5大类。在此基础上,从中选出具有该类典型特征的品种,研究了不同温度处理下叶片的活性氧代谢与细胞膜透性的变化。结果认为:丙二醛含量的增长与细胞膜透性的变化呈极显著的正相关;在40℃高温胁迫下,过氧化物酶与超氧化物歧化酶相对活性的大小和丙二醛含量的增长率及细胞膜透性的变化均呈极显著的负相关;在0℃低温胁迫下,过氧化氢酶相对活性的大小与丙二醛含量的增长率和细胞膜透性的变化也均呈极显著的负相关。以活性氧代谢指标与细胞膜透性为评判耐性大小的依据,各类品种的耐热性大小顺序是Ⅰ类>Ⅴ类>Ⅱ类>Ⅳ类>Ⅲ类,耐寒性大小顺序是Ⅰ类>Ⅱ类>Ⅲ类>Ⅴ类>Ⅳ类。Thirtynine tall fescue varieties,introduced from America,were devided into five types with the aid of cluster analysisOne was selected as the best representive in each type, changes of active oxygen and plasma permeability in leaves of different types of tall fescue varieties exposed to different temperature were also tested The results showed that increasing rate of MDA content were positively correlated significantly with the changes of plasma permeabilityWith 40℃ heat stress,activities of superoxide dismutase(SOD) and peroxidase(POD) were significantly negatively correlated with malonaldehyde(MDA) and plasma permeability(PMP) It also was true in the case of the relationship between catalase (CAT) and MDA,as well as PMP under 0℃ stress Based on the index of active oxygen and plasma permeability, the capability of heat tolerance in the five types of tall fescue was in order:typeⅠ>type Ⅴ>type Ⅱ>type Ⅳ>type Ⅲ, but it showed some different in cold tolerance as: type Ⅰ>type Ⅱ> type Ⅲ> type Ⅴ>type Ⅳ

关 键 词：细胞膜透性 活性氧代谢 高羊茅 草坪草 温度胁迫 抗性 保护酶 酶活性 

分 类 号：S543[农业科学—作物学]