Enrichment Process of 2,4-D Degraders in Different Soils under Upland Conditions
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概要
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In order to evaluate the role of phosphorus (P) nutrition on the drought tolerance of warm season forage crops, i.e. Rhodesgrass (Chloris gayana Kunth) and Job's tears (Coix lacryma-jobi L. var. ma-yuen Stapf.) which are considered to be the most and the least tolerant species to water stress, respectively, the crops were subjected to water stress at two P nutrition levels. Leaf water potential (Ψ_i), stomatal resistance (γ_s), leaf area, shoot and root dry weight, root development, and photosynthetic rate (P_0) were recorded. Shoot and root dry weights decreased at the lower P level and under water stress in both species. Total leaf area per plant decreased by stress and it was smaller at the lower P level than at the higher P level in both species was markedly inhibited by water stress. In rhodesgrass, total root length and root surface area at the higher P level were 2.3 and 1.7 times larger than those at the lower P level, respectively. They were 2.3 and 2.7 times larger in Job's tears. Roots were distributed in deeper layers at the higher P level than the lower P level. Leaf water potential (_i) decreased and _s increased in the water stress treatment. Stomatal sensitivity was increased and P_0 was decreased at the lower P level under water stress conditions in both species. However, at the higher P level, plants maintained a higher value of P_0 at low water potentials compared to the lower P level. The results indicated that a higher level of P nutrition increased the ability of plants to tolerate drought in both species through the increase of total leaf area, and development and penetration of roots in deeper soil layers. Furthermore, P_0 and _s of the plants grown under low P nutritional regime were found to be more sensitive to reductions in _i, compared to the plants grown at a higher level of P nutrition.
- 社団法人日本土壌肥料学会の論文
著者
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Kuwatsuka Shozo
Laboratory Of Soil Science School Of Agriculture Nagoya University
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Kuwatsuka Shozo
Laboratory Of Soil Science Faculty Of Agriculture Nagoya University
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Miwa Noriko
Laboratory Of Microbial Technology Department Of Bioscience And Biotechnology Faculty Of Agriculture
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Miwa Noriko
Laboratory Of Soil Science School Of Agriculture Nagoya University
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