INFLUENCE DES PARAMETRES DE REPRODUCTION SUR LA PRODUCTIVITE DES HYBRIDES F2 NAIN X NAIN

The objective of this study was to evaluate some production parameters for the identification of elite Nain. Twenty-seven coconut trees, spread over 2 plots, were selected. A control, Malay Yellow Dwarf (NJM), was added to each plot. The study of the relationship between five variables revealed highly significant correlations between them. The multivariate analyses made it possible to identify among the genotypes, the type 7 individuals as being the most efficient. Individuals of type 7 had the highest averages for number of flowers at bag laying (NFP), number of flowers at bag removal (NFE), number of knotted flowers (NFN) and number of nuts harvested (NNR) compared to types 4, 5 and 6. Pollen germination rates in type 1 (Control) individuals were significantly higher than those of the other four types that did not differ significantly between them. The tests for the prediction of the number of nuts harvested indicated that 48.31% of the fluctuations of seed nuts reaching maturity are attributable to the number of female flowers counted at the installation of the bag, that of the female flowers counted at the bag removal and that of the female flowers tied. The predicted values for the number of mature seed nuts are: Nnoirec = -1.12 – 0.007*Nflepose + 0.012*Nflenlev + 0.408*Nflnou +0.014TG. Individuals of type 7 likely to be elite broodstock can be used in programs of genetic improvement of the coconut for better performance.