| 陈吉虎,余新晓,孙明高,有祥亮,张长达,谢港.北方旱区不同树种抗氧化酶活性变化及与抗旱性的关系[J].干旱地区农业研究,2006,(5):120~125 |
| 北方旱区不同树种抗氧化酶活性变化及与抗旱性的关系 |
| Relation between activity of antioxidant enzymes and drought resistance of different tree species in north China |
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| DOI：10.7606/j.issn.1000-7601.2006.05.26 |
| 中文关键词: 水分胁迫 树种 活性 抗氧化酶 相对生长率 |
| 英文关键词:drought stress tree species activity antioxidant enzyme relative growth rate |
| 基金项目:国家“十五”攻关计划项目(2001BA510B02—02)； 国家948项目“旱地生态经济型树种抗性选择及综合利用技术引进”(2003413) |
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| 中文摘要: |
| 通过对在干旱胁迫处理下的刺槐(Robinia pseudoaacia),栾树(Koelreuteria paniculata),五角枫(Acermono),君迁子(Diospyros lotus),苦楝(Melia azedarach)5个树种的1年生幼苗的超氧化物歧化酶(SOD)、过氧化氢酶(CAT)、过氧化物酶(POD)3种保护酶活性、丙二醛(MDA)含量、叶片相对电导率和树高相对生长速率等生理指标的测定,结果表明:随着干旱胁迫强度的增加,5树种的各生理指标均有不同程度的变化,保护酶活性和MDA及相对电导率不断升高,相对生长速率则不断下降。其中苦楝的酶系统活性最高,MDA的含量较低,相对电导率最小,受干旱胁迫的影响最小,从而能维持最高的生长速率,和其它树种差别显著;君迁子的3种保护酶活性和相对生长速率最低,MDA的含量和相对电导率最高;栾树的3种保护酶活性变化不显著, 相对电导率较低及MDA的含量最低;刺槐和五角枫的3种保护酶活性、MDA含量、相对电导率和相对生长速率介于苦楝和君迁子两者之间。以树高的相对生长速率作为评价抗旱能力的指标, 则5树种的抗旱能力排序为:苦楝>五角枫>栾树>刺槐>君迁子。 |
| 英文摘要: |
| The one-year-old seedlings of five tree species (Robinia pseudoaacia, Koelreuteria paniculata, Acer mono, Diospyros lotus and Melia azedarach) were tested to study their characteristics of drought resistance.The tested physiological indices included the activity of superoxidase dismutase (SOD) , the activity of catalase (CAT) , the activity of peroxidase (POD) , the content of melondialdehyde (MDA) , the relative electric conductivity and the relative growth rate of five tree species under drought stress.The results showed that, with the enhancement of drought stress, all the physiological indices of five tree species presented different variations.The activity of protective enzyme, the content of MDA and the relative electric conductivity increased persistently, while the relative growth rate decreased persistently.Among the five tree species, the activity of protective enzymes and relative growth rate of Melia azedarach were the highest, the content of MDA was low, and the relative electric conductivity was the lowest, therefore, it had the strongest ability to eliminate the free radicals, to lessen the destructive oxidation, and to maintain a high growth rate;The activity of protective enzymes and relative growth of Diospyros lotus were the lowest, but the content of MDA and relative electric conductivity were the highest;The activity of protective enzymes of Koelreuteria paniculata didn't change obviously, the content of MDA was low, and the relative electric conductivity was the lowest;The changes of the physiological indices of Acer mono and Robinia pseudoaacia were intervenient between Melia azedarach and Diospyros lotu.With the relative growth rate as an evaluation index, the ability of drought resistance of the tested tree species was: Melia azedarach>Acer mono>Koelreuteria paniculata>Robinia pseudoaacia>Diospyros lotus. |
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