Variabilité du potentiel germinatif des semences de certaines populations marocaines de pin maritime (Pinus pinaster Ait.) sous conditions contrôlées

Abstract

Seeds germination obtained from ten Moroccan maritime pine populations growing in three biogeographic areas were studied under controlled photoperiod length and temperature for two pretreatments (stratifications at 4 °C and imbibition with water). Significant differences in germinal potential were noted between batches of seeds. Whereas a relative homogeneity of the germinal behavior of various batches of seeds with respect to duration 12, 48 and 72 h of imbibition was noted. However, the duration of stratification has a differential effect on the speed of germination (T50) between populations and even within the same population. Correlation between geographical parameters, percentage of germination (%G) and T50 shows that longitudinal variations explain about 46% and 39% of the variance, respectively.