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Plant and Cell Physiology, 2002, Vol. 43, No. 6 684-688
© 2002 Oxford University Press

Short Communications

C : N Ratio Increases in the Phloem Sap During Floral Transition of the Long-Day Plants Sinapis alba and Arabidopsis thaliana

Laurent Corbesier1, Georges Bernier and Claire Périlleux

Laboratoire de Physiologie Végétale, Département des Sciences de la Vie, Université de Liège, Sart Tilman B22, B4000 Liège, Belgium

Abstract

In plants of Sinapis alba and Arabidopsis thaliana, leaf exudate (phloem sap) was analysed during and after a single long day inducing flowering and in control short days. The amounts of carbohydrates and amino acids were measured to estimate the organic C : N ratio. In both species, the C : N ratio of the phloem sap increased markedly and early during the inductive treatment, suggesting that an inequality in organic C and N supply to the apical meristem may be important at floral transition.

Footnotes

1 Corresponding author: E-mail, laurent.corbesier@ulg.ac.be; Fax, +32-4366-3831.


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