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The reallocation of carbon in P deficient lupins affects biological nitrogen fixation.
Kleinert, Aleysia; Venter, Mauritz; Kossmann, Jens; Valentine, Alexander.
Afiliación
  • Kleinert A; Botany and Zoology Department, University of Stellenbosch, Private Bag X1, Matieland 7602, South Africa.
  • Venter M; Institute for Plant Biotechnology, Stellenbosch University, Private Bag X1, Matieland 7602, South Africa.
  • Kossmann J; Institute for Plant Biotechnology, Stellenbosch University, Private Bag X1, Matieland 7602, South Africa.
  • Valentine A; Botany and Zoology Department, University of Stellenbosch, Private Bag X1, Matieland 7602, South Africa. Electronic address: alexvalentine@mac.com.
J Plant Physiol ; 171(17): 1619-24, 2014 Nov 01.
Article en En | MEDLINE | ID: mdl-25155758
It is not known how phosphate (P) deficiency affects the allocation of carbon (C) to biological nitrogen fixation (BNF) in legumes. The alteration of the respiratory and photosynthetic C costs of BNF was investigated under P deficiency. Although BNF can impose considerable sink stimulation on host respiratory and photosynthetic C, it is not known how the change in the C and energy allocation during P deficiency may affect BNF. Nodulated Lupinus luteus plants were grown in sand culture, using a modified Long Ashton nutrient solution containing no nitrogen (N) for ca. four weeks, after which one set was exposed to a P-deficient nutrient medium, while the other set continued growing on a P-sufficient nutrient medium. Phosphorus stress was measured at 20 days after onset of P-starvation. During P stress the decline in nodular P levels was associated with lower BNF and nodule growth. There was also a shift in the balance of photosynthetic and respiratory C toward a loss of C during P stress. Below-ground respiration declined under limiting P conditions. However, during this decline there was also a shift in the proportion of respiratory energy from maintenance toward growth respiration. Under P stress, there was an increased allocation of C toward root growth, thereby decreasing the amount of C available for maintenance respiration. It is therefore possible that the decline in BNF under P deficiency may be due to this change in resource allocation away from respiration associated with direct nutrient uptake, but rather toward a long term nutrient acquisition strategy of increased root growth.
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Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Asunto principal: Fósforo / Carbono / Lupinus / Nitrógeno Idioma: En Revista: J Plant Physiol Asunto de la revista: BOTANICA Año: 2014 Tipo del documento: Article País de afiliación: Sudáfrica Pais de publicación: Alemania
Texto completo
Añadir a Mi BVS
Imprimir
XML
PubMed Links
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Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Asunto principal: Fósforo / Carbono / Lupinus / Nitrógeno Idioma: En Revista: J Plant Physiol Asunto de la revista: BOTANICA Año: 2014 Tipo del documento: Article País de afiliación: Sudáfrica Pais de publicación: Alemania