Morphogenèse de la vigne in vitro sous atmosphère enrichie en gaz carbonique : importance de l'antériorité morphogénétique des microboutures et du nombre de subcultures

This study reveals that morphogenesis of grapevine plants (Vitis vinifera L.) produced in vitro under carbon dioxide enriched atmosphereis largely determined by the morphogenetic pattern of vitroplants on which microcuttings were harvested. The presence of tendrils on shoots or shoot parts from which microcuttings were made was essential to obtain a high percentage of adult vitroplants with ternary sequence of tendrils. Therefore, under in vitro culture conditions, the ability of the axillary meristem to produce tendrils is closely correlated with the ability of the apical meristem from which it originated. The interest of these results is discussed from a fundamental standpoint. It allows to suggest an improved process of adult vitroplants production under high carbon dioxide level in which the relative importance of the selection of microcuttings and the number of subcultures is defined.Key words: maturation, micropropagation, tendrils, Vitis vinifera.