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《Peanut Science and Technology》 2002-03
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Physiological and Biochemical Mechanism of Allelopathy of Wedelia trilobata L. on Peanut(Arachis hypogaea L.)

NIE Cheng-rong1,2, ZENG Ren-sen2, LI Hua-shou2, REN Yong-hao2, HUANG Jing-hua2, CHENG Li-qiong1( 1. Dept. of Agronomy, Foshan University, Foshan 528231, China; 2. Institute of Tropical and Subtropical Ecology, South China Agricultural University, Guangzhou 510642, China)  
Wedelia trilobata L. is an important weed and garden herb in South China. The allelopathic effects of aqueous extracts of W. trilobata on the physiological activities of germinating seeds and seedling of peanut were studied. The results showed that the water extracts of root, stem, leaf and the whole plant of W. trilobata reduced the activities of peroxidase by 32.80%, 39.48%, 32.37% and 34.40%, respectively. They reduced the activities of lipase by 21.19%,26.69%,24.15% and 22.88%, respectively. They also significantly increased the membrane permeability, inhibited the respiratory rate and the seed activity. Watering peanut seedlings with the aqueous extracts of W. trilobata resulted in the reduction in dry root weight, numbers of nodule, the leaf chlorophyll content, net photosynthetic rate and the dry weight per plant. Aqueous extract of the leaves reduced the chlorophyll of peanut leaves, net photosynthesis rate and dry weight by 31.95%,32.65% and 37.93%, respectively. They also significantly decreased the activities of nitrate reductase (NR) and glutamine synthetase (GS), the two key enzymes concerning nitrogen metabolism in peanut. The inhibitory effects of aqueous extract of the three organs and whole plant on germinating seeds of peanut were: stem leaf whole plant root, on the seedling growth of peanut were: leaf stem whole plant root.
【Fund】: 国家自然科学基金(39770136);; 广东省自然科学基金(990682)共同资助
【CateGory Index】: S565.2
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