| 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 |
| Key Words: drought stress tree species activity antioxidant enzyme relative growth rate |
| Author Name | Affiliation | | CHEN Ji-hu | College of Soil and Water Conservation Beijing Forestry University,Beijing 100083,China | | YU Xin-xiao | College of Soil and Water Conservation Beijing Forestry University,Beijing 100083,China | | SUN Ming-gao | College of Forestry Shandong Agriculture University,Tai’an,Shandong 271018,China | | YOU Xiang-liang | College of Forestry Shandong Agriculture University,Tai’an,Shandong 271018,China | | ZHANG Chang-da | Shandong Academy of Hydraulic Engineering Reconnaissance and Design,Jinan,Shandong 250013,China | | XIE Gang | Guangrao Bureau of Forestry, Guangrao,Shandong 257300,China |
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| Abstract: |
| 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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