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Depuis l’avenement des chocs petroliers, beaucoup de pays se sont interroges sur le probleme de l’energie. Ainsi, de nombreuses etudes ont ete menees dans le but de resorber ce probleme energetique qui touche en grande partie les pays africains tel que le Senegal. Ces dernieres ont porte sur l’utilisation de sources d’energies renouvelables comme le Jatropha curcas L. qui presente de nombreux avantages biophysiques et medicaux. La presente etude est realisee dans l’objectif d’experimenter l’effet de la conservation dans le temps de differentes gammes de boutures sur son debourrement. Differentes categories de boutures (boutures a 6 nœuds et a 4 nœuds) ayant chacune proportionnellement des classes de diametres comprises entre]0-1] et] 1-2] (cm) ont ete utilisees. Elles ont ete conservees en chambre froide et a l’air libre sur une duree de 45 jours. Chaque 15 eme jour un lot de meme proportion de boutures conservees dans les deux conditions est plante en partant des boutures temoins plantees juste apres recolte. Avant plantation, le statut hydrique des differentes categories de boutures sont relevees a bases d’indicateurs tels que le potentiel hydrique et la teneur en eau. L’evaluation de l’etat hydrique des boutures avec la teneur en eau a donne (86,93%) pour les boutures conservees en chambre froide, et (67,31%) pour celles conservees a l’air libre. Cet effet est reversible avec le potentiel hydrique qui donne respectivement (-0,33%) et (-0,69%). Le debourrement est maximal avec le temoin pour les deux modes de conservation et regresse en fonction du temps de conservation (temoin, 15 jours, 30 jours, 45 jours). Malgre cet effet, les boutures conservees a l’air libre ont connu un meilleur debourrement (92,5%, 70,83%, 67,5%, 42,08%) que celles conservees en chambre froide (85%, 32,5%, 25%, 0%). Cette regression est ainsi assimilee a une augmentation de sa duree de debourrement dans le temps. La teneur en eau, ainsi que le potentiel hydrique varient en fonction du calibre, du mode et du temps de conservation. Cependant, le debourrement des boutures est influence a la fois par le calibre, le mode et le temps de conservation des boutures. Mots cles: Jatropha curcas L., boutures, potentiel, teneur, debourrement, conservation. Propagation by cuttings from Jatropha curcas L.: number of nodes effect, diameter, duration and time storage of the cuttings ABSTRACT Since the advent of the oil crises, many countries have wondered about the problem of energy.Thus, many studies were carried out in order to find a way of resolving this energy issue which mainly touches the African countries such as Senegal. The latter are related to the use of renewable energies sources such as Jatropha curcas L. which has many biophysical and medical advantages. The present study is carried out with the purpose of trying out the effect of the storage within given time of various ranges of cuttings at its bud break. Various categories of cuttings (cuttings with 6 nodes and 4 nodes) having each one, proportionally, classes of diameters included between] 0-1] and] 1-2] (cm) were used. They were stored in cold room and into the open air during 45 days. Each 15th day, a batch of the same proportion of cuttings stored under the two conditions are planted on the basis of the experimental cuttings planted just after harvest. Before plantation, the water status of the various categories of cuttings are recorded as indicators such as the water potential and the water content. The water status evaluation of the cuttings with the water content has given 86,93% for the cuttings preserved in cold room, and 67,31% for those stored into the open air. This effect is reversible with the water potential which gives respectively (-0,33%) and (-0,69%). The bud break is at the highest level with the experimental cuttings for the two ways of storage and regresses according to the time of storage (experimental cutting, 15 days, 30 days, and 45 days). Despite this effect, the cuttings stored into the open air knew the best bud break (92.5%, 70.83%, 67.5%, and 42.08%) that those preserved in cold room (85%, 32.5%, 25%, and 0%). This regression is thus related to an increase of the bud break duration over time. The water content, as well as the water potential varies according to the cuttings diameter, the way and the duration of their storage. However, the bud break of the cuttings is influenced at the same time by the diameter, the way and the duration of the cuttings storage. Keywords : Jatropha curcas L., cuttings, potential, content, bud break, storage

international journal of biological and chemical sciences

Multiplication par bouturage de &lt;i&gt;Jatropha curcas&lt;/i&gt; L. : influence du nombre de nœuds, du diamètre, de la durée et du temps de conservation des boutures