Role of phosphoenolpyruvate carboxylase in the adaptation of a tropical forage grass to low-phosphorus acid soils
As Brachiaria hybrid cv. ‘Mulato’ has adapted to acid soils with extremely low phosphorus (P) contents, its low-P-tolerance mechanisms were investigated and compared with those of wheat (Triticum aestivum L.) and rice (Oryza sativa L. cv. ‘Kitaake’). Among the three plant species, the highest P-use...
| Main Authors: | , , , , , |
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| Format: | Journal Article |
| Language: | Inglés |
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Informa UK Limited
2006
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| Subjects: | |
| Online Access: | https://hdl.handle.net/10568/77694 |
| _version_ | 1855536975990226944 |
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| author | Begum, Hasna Hena Osaki, Mitsuru Nanamori, Masahito Watanabe, Toshihiro Shinano, Takuro Rao, Idupulapati M. |
| author_browse | Begum, Hasna Hena Nanamori, Masahito Osaki, Mitsuru Rao, Idupulapati M. Shinano, Takuro Watanabe, Toshihiro |
| author_facet | Begum, Hasna Hena Osaki, Mitsuru Nanamori, Masahito Watanabe, Toshihiro Shinano, Takuro Rao, Idupulapati M. |
| author_sort | Begum, Hasna Hena |
| collection | Repository of Agricultural Research Outputs (CGSpace) |
| description | As Brachiaria hybrid cv. ‘Mulato’ has adapted to acid soils with extremely low phosphorus (P) contents, its low-P-tolerance mechanisms were investigated and compared with those of wheat (Triticum aestivum L.) and rice (Oryza sativa L. cv. ‘Kitaake’). Among the three plant species, the highest P-use efficiency (PUE) in low-P soil was recorded in the Brachiaria hybrid, which increased remarkably under P-deficiency and soil acidity, while P-deficiency had less effect on the PUE of wheat and rice. As exudation of organic acid anions from roots is considered to be one of the most important mechanisms of adaptation to low-P soil, the role of phosphoenolpyruvate carboxylase (PEPC), which is closely related to organic acid metabolism and Pi recycling in C3 plants, was studied. As expected, the PEPC activity of the Brachiaria hybrid (C4 plant) leaves was 51- to 129-fold higher than that estimated for wheat and rice (both C3 plants). PEPC activity in leaves and roots of the Brachiaria hybrid increased up to two-and three-fold, respectively, and decreased the malate-inhibition ratio in leaves in response to P-deficiency. However, PEPC activity and malate-inhibition ratio were less affected in wheat and rice under P-deficiency. The Brachiaria hybrid synthesized higher amounts of organic acids (e.g., oxalate and fumarate) in leaves, especially under P-deficiency. Results from these experiments indicate that PEPC activated in the Brachiaria hybrid under low-P and low-pH conditions may contribute to the plant's greater adaptation to tropical acid soils with P-low availability. |
| format | Journal Article |
| id | CGSpace77694 |
| institution | CGIAR Consortium |
| language | Inglés |
| publishDate | 2006 |
| publishDateRange | 2006 |
| publishDateSort | 2006 |
| publisher | Informa UK Limited |
| publisherStr | Informa UK Limited |
| record_format | dspace |
| spelling | CGSpace776942025-03-13T09:45:09Z Role of phosphoenolpyruvate carboxylase in the adaptation of a tropical forage grass to low-phosphorus acid soils Begum, Hasna Hena Osaki, Mitsuru Nanamori, Masahito Watanabe, Toshihiro Shinano, Takuro Rao, Idupulapati M. feed crops brachiaria hybrids adaptation acid soils phosphorus aluminium soil ph híbridos suelo ácido fósforo aluminio ph del suelo As Brachiaria hybrid cv. ‘Mulato’ has adapted to acid soils with extremely low phosphorus (P) contents, its low-P-tolerance mechanisms were investigated and compared with those of wheat (Triticum aestivum L.) and rice (Oryza sativa L. cv. ‘Kitaake’). Among the three plant species, the highest P-use efficiency (PUE) in low-P soil was recorded in the Brachiaria hybrid, which increased remarkably under P-deficiency and soil acidity, while P-deficiency had less effect on the PUE of wheat and rice. As exudation of organic acid anions from roots is considered to be one of the most important mechanisms of adaptation to low-P soil, the role of phosphoenolpyruvate carboxylase (PEPC), which is closely related to organic acid metabolism and Pi recycling in C3 plants, was studied. As expected, the PEPC activity of the Brachiaria hybrid (C4 plant) leaves was 51- to 129-fold higher than that estimated for wheat and rice (both C3 plants). PEPC activity in leaves and roots of the Brachiaria hybrid increased up to two-and three-fold, respectively, and decreased the malate-inhibition ratio in leaves in response to P-deficiency. However, PEPC activity and malate-inhibition ratio were less affected in wheat and rice under P-deficiency. The Brachiaria hybrid synthesized higher amounts of organic acids (e.g., oxalate and fumarate) in leaves, especially under P-deficiency. Results from these experiments indicate that PEPC activated in the Brachiaria hybrid under low-P and low-pH conditions may contribute to the plant's greater adaptation to tropical acid soils with P-low availability. 2006-01 2016-11-10T14:47:33Z 2016-11-10T14:47:33Z Journal Article https://hdl.handle.net/10568/77694 en Open Access Informa UK Limited Begum, Hasna Hena; Osaki, Mitsuru; Nanamori, Masahito; Watanabe, Toshihiro; Shinano, Takuro; Rao, Idupulapati Madhusudana. 2006. Role of phosphoenolpyruvate carboxylase in the adaptation of a tropical forage grass to low-phosphorus acid soils . Journal of Plant Nutrition (USA) 29:35-57. |
| spellingShingle | feed crops brachiaria hybrids adaptation acid soils phosphorus aluminium soil ph híbridos suelo ácido fósforo aluminio ph del suelo Begum, Hasna Hena Osaki, Mitsuru Nanamori, Masahito Watanabe, Toshihiro Shinano, Takuro Rao, Idupulapati M. Role of phosphoenolpyruvate carboxylase in the adaptation of a tropical forage grass to low-phosphorus acid soils |
| title | Role of phosphoenolpyruvate carboxylase in the adaptation of a tropical forage grass to low-phosphorus acid soils |
| title_full | Role of phosphoenolpyruvate carboxylase in the adaptation of a tropical forage grass to low-phosphorus acid soils |
| title_fullStr | Role of phosphoenolpyruvate carboxylase in the adaptation of a tropical forage grass to low-phosphorus acid soils |
| title_full_unstemmed | Role of phosphoenolpyruvate carboxylase in the adaptation of a tropical forage grass to low-phosphorus acid soils |
| title_short | Role of phosphoenolpyruvate carboxylase in the adaptation of a tropical forage grass to low-phosphorus acid soils |
| title_sort | role of phosphoenolpyruvate carboxylase in the adaptation of a tropical forage grass to low phosphorus acid soils |
| topic | feed crops brachiaria hybrids adaptation acid soils phosphorus aluminium soil ph híbridos suelo ácido fósforo aluminio ph del suelo |
| url | https://hdl.handle.net/10568/77694 |
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