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Low Phosphorus Tolerance Mechanisms: Phosphorus Recycling and Photosynthate Partitioning in the Tropical Forage Grass, Brachiaria Hybrid cultivar Mulato Compared with Rice

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タイトル: Low Phosphorus Tolerance Mechanisms: Phosphorus Recycling and Photosynthate Partitioning in the Tropical Forage Grass, Brachiaria Hybrid cultivar Mulato Compared with Rice
著者: Nanamori, Masahiko 著作を一覧する
Shinano, Takuro 著作を一覧する
Wasaki, Jun 著作を一覧する
Yamamura, Takuya 著作を一覧する
Rao, Idupulapati M. 著作を一覧する
Osaki, Mitsuru 著作を一覧する
キーワード: Brachiaria hybrid
Low P tolerance
Phosphohydrolase
Photosynthate distribution
Rice (Oryza sativa L.)
発行日: 2004年 4月
出版者: Oxford University Press
誌名: Plant and Cell Physiology
巻: 45
号: 4
開始ページ: 460
終了ページ: 469
出版社 DOI: 10.1093/pcp/pch056
抄録: The Brachiaria hybrid cv. Mulato is well adapted to low-fertility acid soils deficient in phosphorus (P). To study the grassy forage’s mechanisms for tolerating low P supply, we compared it with rice (Oryza sativa L. cv. Kitaake). We tested by using nutrient solution cultures, and quantified the effects of P deficiency on the enzymatic activities of phosphohydrolases and on carbon metabolism in P-deficient leaves. While P deficiency markedly induced activity of phosphohydrolases in both crops, the ratio of inorganic phosphorus to total P in leaves was greater in Brachiaria hybrid. Phosphorus deficiency in leaves also markedly influenced the partitioning of carbon in both crops. In the Brachiaria hybrid, compared with rice, the smaller proportion of 14C partitioned into sugars and the larger proportion into amino acids and organic acids in leaves coincided with decreased levels of sucrose and starch. Hence, in P-deficient leaves of the Brachiaria hybrid, triose-P was metabolized into amino acids or organic acids. Results thus indicate that the Brachiaria hybrid, compared with rice, tolerates low P supply to leaves by enhancing sugar catabolism and by inducing the activity of several phosphohydrolases. This apparently causes rapid P turnover and enables the Brachiaria hybrid to use P more efficiently.
記述: This is a pre-copy editing, author-produced PDF of an article accepted for publication in "Plant and Cell Physiology" following peer review. The definitive publisher-authenticated version is available online.
資料タイプ: article (author version)
URI: http://hdl.handle.net/2115/515
出現コレクション:雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

提供者: 信濃 卓郎

 

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