C : N ratio increases in the phloem sap during floral transition of the long-day plants Sinapis alba and Arabidopsis thaliana.
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.
Corbesier
Laurent
L
Laboratoire de Physiologie Végétale, Département des Sciences de la Vie, Université de Liège, Sart Tilman B22, B4000 Liège, Belgium. laurent.corbesier@ulg.ac.be
Bernier
Georges
G
Périlleux
Claire
C
D000596:Amino Acids / Q000378:metabolism; D017360:Arabidopsis / Q000502:physiology*; D050260:Carbohydrate Metabolism; D002244:Carbon / Q000378:metabolism*; D009149:Mustard Plant / Q000502:physiology*; D009584:Nitrogen / Q000378:metabolism*; D017440:Photoperiod; D018514:Plant Structures / Q000502:physiology*; D012098:Reproduction / Q000502:physiology
D000596:Amino Acids; D002244:Carbon; D009584:Nitrogen