Article (Scientific journals)
N content of phloem and xylem exudates during the transition to flowering in Sinapis alba and Arabidopsis thaliana
Corbesier, Laurent; Havelange, Andrée; Lejeune, Pierre et al.
2001In Plant, Cell and Environment, 24, p. 367-375
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Keywords :
Flowering; C:N ratio; phloem; xylem; nitrogen; amino acids
Abstract :
[en] The involvement of nitrogenous substances in the transition to flowering was investigated in Sinapis alba and Arabidopsis thaliana (Columbia). Both species grown in short days (SD) are induced to flower by one long day (LD). In S. alba, the phloem sap (leaf and apical exudates) and the xylem sap (root exudate) were analysed in LD versus SD. In A. thaliana, only the leaf exudate could be analysed but an alternative system for inducing flowering without day-length extension was used: the displaced SD (DSD). Significant results are: (i) in both species, the leaf exudate was enriched in Gln during the inductive LD, at a time compatible with export of the floral stimulus; (ii) in S. alba, the root export of amino acids decreased in LD, whereas the nitrate remained unchanged - thus the extra-Gln found in the leaf exudate should originate from the leaves; (iii) extra-Gln was also found very early in the apical exudate of S. alba in LD, together with more Glu; (iv) in A. thaliana induced by one DSD, the leaf export of Asn increased sharply, instead of Gln in LD. This agrees with Asn prevalence in C-limited plants. The putative role of amino acids in the transition to flowering is discussed.
Disciplines :
Phytobiology (plant sciences, forestry, mycology...)
Author, co-author :
Corbesier, Laurent;  Université de Liège - ULiège > Département des sciences de la vie > Physiologie végétale
Havelange, Andrée ;  Université de Liège - ULiège > Département des sciences de la vie > Physiologie végétale
Lejeune, Pierre ;  Université de Liège - ULiège > Département des sciences de la vie > Physiologie végétale
Bernier, Georges ;  Université de Liège - ULiège > Sciences de la vie > Physiologie végétale
Périlleux, Claire ;  Université de Liège - ULiège > Département des sciences de la vie > Physiologie végétale
Language :
English
Title :
N content of phloem and xylem exudates during the transition to flowering in Sinapis alba and Arabidopsis thaliana
Publication date :
2001
Journal title :
Plant, Cell and Environment
ISSN :
0140-7791
eISSN :
1365-3040
Publisher :
Blackwell Publishing, New York, United States - New York
Volume :
24
Pages :
367-375
Peer reviewed :
Peer Reviewed verified by ORBi
Name of the research project :
EC contract BI04 CT97-2231; Interuniversity Attraction Poles Programme P4/15
Funders :
DG RDT - Commission Européenne. Direction Générale de la Recherche et de l'Innovation [BE]
BELSPO - Politique scientifique fédérale [BE]
FRIA - Fonds pour la Formation à la Recherche dans l'Industrie et dans l'Agriculture [BE]
F.R.S.-FNRS - Fonds de la Recherche Scientifique [BE]
ULiège FSR - Université de Liège. Fonds spéciaux pour la recherche [BE]
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