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《JOURNAL OF CHINA AGRICULTURAL UNIVERSITY》 1999-03
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Exudation of Organic Acids by the Roots of Different Plant Species under Phosphorus Deficiency

Chen Kai; Ma Jing; Cao Yiping ;Zhang Fusuo (College of Resources and Environment,CAU)  
The kinds and amount of low molecular weight (LMW) organic acids collected directly from roots of six pIant species with high ability of P adaptation under water solution culture were analyzed by gas chromatography technique. Results showed that the total amount of LMW organic acids excreted by the roots of six plants with P deficiency treatment.increased in different extents and the release of LMW organic acid also varied in the kind and proportion of total amount of LMW organic acid, compared to the plants with adequate P supply. For example, 73% and 20% of LMW organic acids released by radish were tartaric acid and malic acid respectively and their total released amount increased by 43 times. 99%of LMW organic acids was tartaric acid and only increased by 4 times in India cowpea. In buckwheat 84% and 16% of LMW organic acids were tartaric acid and oxalic acid respectively and their total released amount increased by 8 times. In corn(ND60) 94 % of LMW organic acids with 4-time increment was tartaric acid. However, for white lupin the dominant LMW organic acid, 65% of LMW organic acids was citric acid and increased by 11 times.For rape, 80% and 17% of LMW organic acids were malic acid and oxalic acid respectively and the increment was 38 times.
【Key Words】： phosphorus deficiency root exudate low molecular-weight organic acid
【Fund】： 国家自然科学基金!39790100
【CateGory Index】： Q945.12
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