Effect of Exudate Released from Seeds and Seedling Roots of Common Bean (Phaseolus vulgaris L.) on Proliferation of Rhizobium Sp. (Phaseolus)
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概要
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Effects of seed and root exudates obtained from common bean on the proliferation of Rhizobium sp. (Phaseolus) were examined in a combination of three plant cultivars with three Rhizobium strains. In the first experiment, seed or root exudate was mixed with an Andosol soil extract, and bacterial proliferation in the mixture was traced. Seed exudate was prepared from hydroponic solution used in seed imbibition for 24 h, and a series of root exudates was prepared from a hydroponic solution collected every 24 h from the initiation of rooting up to 96 h after rooting. Regardless of the common bean cultivars and Rhizobium strains used, Rhizobium population markedly increased of the 24 h of culture in the mixture containing seed exudates, whereas a negligible increase was detected in the mixture with root exudates. The mixture containing root exudates collected within a period of 72-96 h after initial rooting (96-120 h after seed imbibition) exerted an inhibitory effect on Rhizobium proliferation. The seed exudates contained large amounts of sugars, amino acids, nitrogen, phosphorus, potassium, and magnesium compared to any root exudates. In the second experiment, Rhizobium was inoculated directly to common bean seeds sowed in a vermiculite bed which was sterilized and moistened with a plant nutrient solution. Compared with the control (without seed), a remarkable increase in the number of bacterial cells was observed in all the combinations of plant cultivars and Rhizobium strains 24 h after sowing. These results reveal that seed exudates of common bean have a substantial potential to promote Rhizobium proliferation, and that root exudates in a particular period of culture contain some inhibitory factors.
- 社団法人日本土壌肥料学会の論文
著者
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Hirata Hiroshi
Faculty of Agriculture, Shizuoka University
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ARIMA Yasuhiro
Faculty of Agriculture, Tokyo University of Agriculture and Technology
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Arima Y
Faculty Of Agriculture Tokyo University Of Agriculture And Technology
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Arima Yasuhiro
Faculty Of Agriculture Tokyo University Of Agriculture And Technology
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Kato K
United Graduate School Of Agricultural Science Tokyo University Of Agriculture And Technology
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Hirata H
Faculty Of Agriculture Tokyo University Of Agriculture And Technology
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Kato Kotaro
Faculty of Agriculture, Tokyo University of Agriculture and Technology
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Hirata Hiroshi
Faculty Of Agriculture University Of Tokyo
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Hirata Hiroshi
Faculty Of Agriculture The University Of Tokyo
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