Influence of nitrate supply on concentrations and translocation of abscisic acid in barley (Hordeum vulgare)

aba acide abscissique azote hordeum vulgare nitrate nitrates nitratos nitrogen nutrient transport racine radioimmunoassay relaciones fuente sumidero relation source puits roots source sink relations stems tallo technique radioimmunologique tige transport des substances nutritives transporte de nutrientes