Sucrose increase during floral induction in the phloem sap collected at the apical part of the shoot of the long-day plant Sinapis alba L. |
| |
Authors: | Pierre Lejeune Georges Bernier Marie-Christine Requier Jean-Marie Kinet |
| |
Institution: | (1) Service de Physiologie Végétale, Institut de Botanique B22, Université de Liège, Sart-Tilman, B-4000 Liège, Belgium;(2) Centre de Physiologie Végétale Appliquée, Institut de Botanique B22, Université de Liège, Sart-Tilman, B-4000 Liège, Belgium;(3) Present address: Département de Biologie, Université de Louvain (UCL), Place Croix du Sud n 5, B-1348 Louvain-la-Neuve, Belgium |
| |
Abstract: | Sinapis alba L., a long-day plant, has been induced to flower either by a single 22-h-long photoperiod or by an 8-h short photoperiod displaced by 10 h in a 24 h cycle. The ehtylenediametetraacetate method previously used for leaf exudation was modified to collect phloem sap at the apical part of the shoot. Carbohydrates in the phloem sap have been analysed comparatively in vegetative and induced plants, using high-performance liquid chromatography and refractometry. Sucrose was the major sugar detected. A dramatic increase of its flux in the apical sap occurred early and transiently during the floral transition in plants induced by both long days and displaced short days. These results indicate a message-like role for sucrose since they fit nicely with previous observations indicating that an early event in the floral transition in S. alba is the accumulation of sucrose in the meristem.Abbreviations DSD
displaced short day
- LD
long day
- SD
short day
This work was supported by the Fonds pour la Recherche Fondamentale et Collective (FRFC) of Belgium (Grant n 2.9009.87) and the University of Liège (Action de Recherche Concertée 88/93-29). One of us (P.L.) is grateful to the I.R.S.I.A. for the award of a research fellowship. |
| |
Keywords: | Carbohydrate Flower induction Phloem sap Sinapis |
本文献已被 SpringerLink 等数据库收录! |
|