AustralieFrV1, Main, Exploration, bibRecord, 00B085

Photosynthesis-Rubisco relationships in foliage of Pinus sylvestris in response to nitrogen supply and the proposed role of Rubisco and amino acids as nitrogen stores

Identifieur interne : 00B085 ( Main/Exploration ); précédent : 00B084; suivant : 00B086

Photosynthesis-Rubisco relationships in foliage of Pinus sylvestris in response to nitrogen supply and the proposed role of Rubisco and amino acids as nitrogen stores

Auteurs : Charles R. Warren [Australie] ; Erwin Dreyer [France] ; Mark A. Adams [Australie]

Source :

Trees : (Berlin. Print) [ 0931-1890 ] ; 2003.

RBID : Pascal:03-0387446

Descripteurs français

Pascal (Inist)
- Photosynthèse, Ribulose-bisphosphate carboxylase, Aminoacide, Azote, Accumulation biologique, Feuille végétal, Echange gazeux, Pinus sylvestris.
Wicri :
- topic : Azote.

English descriptors

KwdEn :
- Aminoacid, Biological accumulation, Gas exchange, Nitrogen, Photosynthesis, Pinus sylvestris, Plant leaf, Ribulose-bisphosphate carboxylase.

Abstract

Relationships between photosynthetic capacity, and needle contents of N, Rubisco and amino acids were investigated in potted Pinus sylvestris L. trees. Three-year-old seedlings of P. sylvestris were grown for 4 years with three nutrient regimes. Concentrations of N, amino acids, amides and Rubisco were measured and expressed on a needle area basis, and the in vivo performances of Rubisco (maximum rate of carboxylation, V_cmax) and of electron transport (maximum light driven electron flux, J_max) were estimated via a biochemically based model of photosynthesis. Needle content of Rubisco-N was at least six times that of amino acid + amide-N and was positively related to N_area. The estimated in vivo specific activity of Rubisco (V_cmax/Rubisco content per unit area) was low and negatively related to N content per unit area (N_area). J_max/Rubisco content was negatively related to N_area, whereas V_cmax/J_max was unrelated to N_area. Hence, Rubisco content was in excess of the amount required for photosynthesis and this excess was positively related to N_area. These data support the hypothesis that with increasing N_area, Rubisco functions increasingly as a storage protein in addition to its catalytic functions.

Affiliations:

Australie, France

Links toward previous steps (curation, corpus...)

to stream PascalFrancis, to step Corpus: 005280
to stream PascalFrancis, to step Curation: 000E46
to stream PascalFrancis, to step Checkpoint: 004E57
to stream Main, to step Merge: 00BE42
to stream Main, to step Curation: 00B085

Le document en format XML

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<front><div type="abstract" xml:lang="en">Relationships between photosynthetic capacity, and needle contents of N, Rubisco and amino acids were investigated in potted Pinus sylvestris L. trees. Three-year-old seedlings of P. sylvestris were grown for 4 years with three nutrient regimes. Concentrations of N, amino acids, amides and Rubisco were measured and expressed on a needle area basis, and the in vivo performances of Rubisco (maximum rate of carboxylation, V<sub>cmax</sub>
) and of electron transport (maximum light driven electron flux, J<sub>max</sub>
) were estimated via a biochemically based model of photosynthesis. Needle content of Rubisco-N was at least six times that of amino acid + amide-N and was positively related to N<sub>area</sub>
. The estimated in vivo specific activity of Rubisco (V<sub>cmax</sub>
/Rubisco content per unit area) was low and negatively related to N content per unit area (N<sub>area</sub>
). J<sub>max</sub>
/Rubisco content was negatively related to N<sub>area</sub>
, whereas V<sub>cmax</sub>
/J<sub>max</sub>
 was unrelated to N<sub>area</sub>
. Hence, Rubisco content was in excess of the amount required for photosynthesis and this excess was positively related to N<sub>area</sub>
. These data support the hypothesis that with increasing N<sub>area</sub>
, Rubisco functions increasingly as a storage protein in addition to its catalytic functions.</div>
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Photosynthesis-Rubisco relationships in foliage of Pinus sylvestris in response to nitrogen supply and the proposed role of Rubisco and amino acids as nitrogen stores

Photosynthesis-Rubisco relationships in foliage of Pinus sylvestris in response to nitrogen supply and the proposed role of Rubisco and amino acids as nitrogen stores

Source :

Descripteurs français

English descriptors

Abstract

Links toward previous steps (curation, corpus...)

Le document en format XML

Pour manipuler ce document sous Unix (Dilib)

Pour mettre un lien sur cette page dans le réseau Wicri