Unite;
mixte;
de;
recherche,;
Biochimie;
et;
Physiologie;
Molculaire;
des;
Plantes,;
Montpellier;
SupAgro/CNRS/INRA/UM2,;
2;
place;
Pierre;
Viala,;
34060;
MontpellierCedex;
2,;
France;
Department;
of;
Metabolic;
Biology,;
John;
Innes;
Centre,;
Norwich;
NR4;
7UH,;
UK;