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influence of root assimilated inorganic carbon on nitrogen acquisition/assimilation and carbon partitioning

Viktor, A. ; Cramer, M. D.

The New phytologist, 2005, Vol.165 (1), p.157-169 [Periódico revisado por pares]

Oxford, UK: Blackwell Science

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Título:
influence of root assimilated inorganic carbon on nitrogen acquisition/assimilation and carbon partitioning
Autor: Viktor, A. ; Cramer, M. D.
Assuntos: Amino acids ; ammonium compounds ; assimilation (physiology) ; Biological and medical sciences ; Biological Transport ; carbon ; Carbon - metabolism ; Carbon dioxide ; Carbon Dioxide - metabolism ; Carbon Dioxide - pharmacology ; carbon partitioning ; carbonate dehydratase ; carbonic anhydrase ; Carbonic Anhydrases - metabolism ; dissolved inorganic carbon ; enzyme activity ; Fundamental and applied biological sciences. Psychology ; growth ; inorganic compounds ; Leaves ; Lycopersicon esculentum ; Lycopersicon esculentum (tomato) ; Lycopersicon esculentum - growth & development ; Lycopersicon esculentum - metabolism ; Metabolism ; Nitrate Reductase ; nitrate reductase (NADH) ; Nitrate Reductases - metabolism ; Nitrates ; Nitrogen ; Nitrogen - metabolism ; nutrient uptake ; Nutrition ; Organic acids ; phosphoenolpyruvate carboxylase ; Phosphoenolpyruvate Carboxylase - metabolism ; Photosynthesis, respiration. Anabolism, catabolism ; plant growth ; Plant Leaves - metabolism ; Plant physiology and development ; Plant roots ; Plant Roots - metabolism ; Plant Stems - metabolism ; Plants ; Radiocarbon ; roots ; Soil - analysis ; soil nutrients ; Solanum lycopersicum var. lycopersicum ; Time Factors ; tomatoes ; vegetable crops
É parte de: The New phytologist, 2005, Vol.165 (1), p.157-169
Notas: ObjectType-Article-1
SourceType-Scholarly Journals-1
ObjectType-Feature-2
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Descrição: • Understanding of the influences of root-zone CO2 concentration on nitrogen (N) metabolism is limited. • The influences of root-zone CO2 concentration on growth, N uptake, N metabolism and the partitioning of root assimilated 14 C were determined in tomato (Lycopersicon esculentum). • Root, but not leaf, nitrate reductase activity was increased in plants supplied with increased root-zone CO2. Root phosphoenolpyruvate carboxylase activity was lower with NO3-- than with NH4+-nutrition, and in the latter, was also suppressed by increased root-zone CO2. Increased growth rate in NO3-- fed plants with elevated root-zone CO2 concentrations was associated with transfer of root-derived organic acids to the shoot and conversion to carbohydrates. With NH4+- fed plants, growth and total N were not altered by elevated root-zone CO2 concentrations, although 14 C partitioning to amino acid synthesis was increased. • Effects of root-zone CO2 concentration on N uptake and metabolism over longer periods (> 1 d) were probably limited by feedback inhibition. Root-derived organic acids contributed to the carbon budget of the leaves through decarboxylation of the organic acids and photosynthetic refixation of released CO2.
Editor: Oxford, UK: Blackwell Science
Idioma: Inglês

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influence of root assimilated inorganic carbon on nitrogen acquisition/assimilation and carbon partitioning

Viktor, A. ; Cramer, M. D.

Oxford, UK: Blackwell Science

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