Mise en évidence d'une régulation de l'efflux de NO3 racinaire par la partie aérienne chez quatre cultivars de blé tendre (Triticum aestivum L.), Sais, Jouda, Marchouch et Khair : influence de la lumière

摘要: Nitrate exsorption in relation to light was studied four wheat (Triticum aestivum L.) cultivars, Sais, Jouda, Marchouch, and Khair, using experimental treatments: intact plants, excised roots, defoliated decapitated plants. Data show that nitrate dramatically reduced from roots compared controls. This efflux reduction also observed the of On contrary, defoliation triggered a significant increase quantity exsorbed NO3–, as increased much more dramatic when plants were exposed darkness; then 8 10 times larger than roots. In 21-day-old plantlets, aboveground parts are main site for regulation at root level. Both leaves apex organs responsible this regulation. Indeed, by and, on stimulated apex. Light was...