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Provedor de dados:  Inra
País:  France
Título:  Etude de la correlation des teneurs en K, Ca ou Mg entre feuilles et epines de Citrus volkameriana Ten et Pasq
Correlation of K, Ca or Mg concentrations between leaves and thorns of Citrus volkameriana Ten and Pasq
Autores:  Morisot, A.
Segur-Fantino, N.
Montarone, M.
Ballino, N.
Pionnat, J.C.
Data:  1991
Ano:  1991
Palavras-chave:  ECHANTILLON
EPINE
CITRUS VOLKAMERIANA
Resumo:  La recherche d’organes pouvant être prélevés sur des jeunes plants de Citrus en expérimentation, afin de préserver les feuilles, explique l’intérêt suscité par une éventuelle corrélation entre la composition minérale des feuilles et celle des épines associées. Sur une culture hors-sol de C volkameriana de 6 mois différenciée par la concentration en K de la fertirrigation (2, 4, 6, 8 ou 10 mmol-(K).|-1 on étudie la relation entre les teneurs en K, Ca ou Mg des feuilles et épines. Avec des règles de prélèvement précisées ici, les teneurs des épines sont significativement corrélées à celles des feuilles qu’elles axillent. La différenciation en K de l’appareil végétatif peut ainsi être caractérisée en prélevant des épines, donc en préservant le système foliaire. Par ailleurs, les épines permettent d’évaluer les profils de teneurs en Ca et Mg le long du plant, c’est-à-dire d’étudier leur gradient de répartition verticale.

A search for samples other than leaves, so that the latter remained on young citrus trees under experiment, led to the study of possible link between cationic concentrations in associated leaf and thorn. Citrus volkameriana were grown in a glasshouse on a soilless system with 5 K levels (2, 4, 6, 8 or 10 mmol-(K).|-1). 3 sampling levels were chosen along the plant (fig 1); 6 replicates were available. Potassium concentrations were significantly correlated within each sampling level (fig 2a). Thus, 3 regressions had to be considered, which differed for each location. The effect of the differentiated K supply on leaf K content was measured by comparing K concentrations in thorns sampled within a given level. Calcium and magnesium concentrations were shown to be significantly correlated between associated leaves and thorns when the 3 sampling levels were considered as a whole. Variability was then mainly explained by the distribution gradient along the plant, either due to Ca immobilisation (fig 2b, higher contents in older organs) or Mg redistribution (fig 2c, lower contents in older organs). The Ca and Mg vertical distribution along the plant axis could therefore be characterised by comparing Ca and Mg concentrations of thorns sampled along this axis. The influence of sampling location and differentiated K supplies on observed foliage concentrations are discussed for the 3 cations.
Tipo:  Journal Article
Idioma:  Francês
Identificador:  http://www.prodinra.inra.fr/prodinra/pinra/doc.xsp?id=PUB9100001162019518&uri=/notices/prodinra1/2009/04/

http://www.prodinra.inra.fr/prodinra/pinra/data/2009/04/PUB910000116201951_20090421021609743.pdf
Formato:  application/pdf
Fonte:  Agronomie. 1991, 11 (2) : 119-123
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