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Pour l'agriculture moderne, le nitrate constitue la forme incontournable d'apport azote aux cultures. Les craintes que suscite son taux parfois excessif dans les aliments et l'environnement, ont incite les biologistes a intensifier l'etude des processus de son absorption et de son assimilation par les plantes. Les premiers essais de transgenese, visant a optimiser ces etapes cles, sont encourageants.
Dans certaines conditions environnementales, les plantes produisent des radicaux libres, formes tres reactives de l'oxygene capables de detruire les structures cellulaires. Les mecanismes de defense enzymatique dont disposent les vegetaux pour assurer le nettoyage cellulaire de ces radicaux libres ne sont pas toujours suffisants. Les premiers essais de transgenese, ayant pour but d'ameliorer...
La photorespiration conduit-elle vraiment a une deperdition de matiere organique chez les plantes? C'est, en tous cas, ce qu'ont pense les scientifiques pendant plus de vingt ans. Alors, pour tenter de reduire ce phenomene et augmenter le rendement des cultures, ils ont eu recours aux avancees des biotechnologies. En vain. Devant l'echec de leurs tentatives, ils ont donc cherche a savoir quel...
In the present work we evaluate the accumulation and further remobilization of vegetative storage proteins (VSP) in chicory. A protein with molecular weight of 17kDa, corresponding to 7 isoforms with pi ranging between 5 and 7, accumulated dramatically over the vegetative phase from spring to autumn and was extensively depleted during the flowering period in the following summer, a pattern typical...
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