Etude de la fertilite femelle de cinq clones cultives D'<i>hevea brasiliensis</i> muell arg. (Euphorbiacee), en C&#244 D'Ivoire

Abstract

RESUMEAprès 15 années de pollinisation manuelle, la fertilité femelle des clones cultivés wickham de Hevea brasiliensis a été évaluée en Côte d'Ivoire, à partir de 3 estimateurs tels que : les taux de nouaison, d'abscission des fruits et de succès à la pollinisation. La structuration de cette fertilité, par rapport aux 3 estimateurs, a été étudiée chez 5 clones cultivés wickham, à l'aide de l'analyse factorielle discriminante. Mots-clés :Hevea brasiliensis, nouaison, abscission, fruits, pollinisation. ABSTRACT FEMALE FERTILITY OF FIVE RUBBER TREE CLONES (Hevea brasiliensis MUELL ARG) IN CÔTE D'IVOIREAfter 15 years of manual pollination in Côte d'Ivoire, female fertility of Hevea brasiliensis rubber tree clones was assessed from 3 estimators of fertility, which were the aborted seed, was studied in 5 wickham clones, using a discriminate factor analysis. The PB5/51, PB260 and PB235 clones, which were good seeders, had high initial and final fruit set average rates (11.23 to 15.17 % and 7.09 to 9.13 %), with the highest average rates of aborted seeds (31.72 to 55.91 %). These were, either lower, or higher (18.86 to 41.84 %) for the GT1 and AVROS2037 clones, which were found to be bad seeders. Overall, the study showed a better understanding of the low fertility of the Hevea brasiliensis rubber tree through the identification of good (PB5/ 51, PB 260, PB 235) and bad seeders (GT 1, AVROS 2037).