Interaction between Nitrogen Deficit of a Plant and Nitrogen Content in the Old Leaves
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概要
- 論文の詳細を見る
We examined changes in nitrogen content of the first leaves in relation to growth and nitrogen status of sunflower (Helianthus annuus L.) plants that were raised hydroponically at two irradiance levels (high and low light, HL and LL) and at two nitrogen concentrations (high and low nitrogen, HN and LN). Initial increases in total dry mass and total nitrogen of the whole plant were faster in HL-plants than in LL-plants irrespective of nitrogen supply, but in LN-plants the increase in total nitrogen was soon blunted. When plants grown under the same irradiance were compared, nitrogen content of the first leaves (leaf N) decreased faster in LN-plants than in HN-plants, while for the plants grown at the same nitrogen concentrations, it decreased faster in HL-plants than in LL-plants. Since these changes in leaf N were not explained solely by the changes in plant dry mass or plant nitrogen, we introduced an index, 'nitrogen deficit (ND*)', to quantify nitrogen deficit of the whole plant. ND* was expressed as ND*(t)=[N_<max>-N(t)] × DM(t), where N_<max> and N(t) were nitrogen contents in the young, expanding leaves that had just unfolded to ex-pand, at the initial stage with sufficient nitrogen and at time t, respectively, and DM(t), plant dry mass at t. The decrease in leaf N was expressed as a liner function of ND* irrespective of the growth conditions, which indicates validity of this index. Limitation of the use of ND*, and mechanisms by which leaves sense nitrogen demand are also discussed.
- 日本植物生理学会の論文
著者
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Watanabe Akira
Department of Biological Sciences, Graduate School of Science, University of Tokyo
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Ono Kiyomi
Department of Plant Physiology,National Institute of Agrobiological Sciences
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Ono Kiyomi
Department Of Biological Sciences Graduate School Of Science University Of Tokyo
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Ono Kiyomi
Department Of Bio-medical Engineering Tokai University
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Terashima Ichiro
Institute of Biological Sciences, University of Tsukuba
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Terashima Ichiro
Institute Of Biological Sciences University Of Tsukuba
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Watanabe Akira
Department Of Biological Sciences Graduate School Of Science The University Of Tokyo
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Watanabe Akira
Department Of Biological Sciences Graduate School Of Science University Of Tokyo
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Watanabe Akira
Department Of Applied Biological Chemistry Faculty Of Agriculture Tohoku University
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