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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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Title: Low Phosphorus Tolerance Mechanisms: Phosphorus Recycling and Photosynthate Partitioning in the Tropical Forage Grass, Brachiaria Hybrid cultivar Mulato Compared with Rice
Authors: Nanamori, Masahiko Browse this author
Shinano, Takuro2 Browse this author
Wasaki, Jun Browse this author
Yamamura, Takuya Browse this author
Rao, Idupulapati M. Browse this author
Osaki, Mitsuru Browse this author →KAKEN DB
Authors(alt): 信濃, 卓郎2
Keywords: Brachiaria hybrid
Low P tolerance
Phosphohydrolase
Photosynthate distribution
Rice (Oryza sativa L.)
Issue Date: Apr-2004
Publisher: Oxford University Press
Journal Title: Plant and Cell Physiology
Volume: 45
Issue: 4
Start Page: 460
End Page: 469
Publisher DOI: 10.1093/pcp/pch056
Abstract: 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.
Description: 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.
Type: article (author version)
URI: http://hdl.handle.net/2115/515
Appears in Collections:創成研究機構 (Creative Research Institution) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 信濃 卓郎

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