Abstract

ESPITIA C., Miguel; VARGAS O., Luz E.  and  MARTINEZ F, Guillermo. PATH ANALYSIS FOR SOME FRUIT PROPERTIES OF PASSION FRUIT (Passiflora edulis f. flavicarpa Deg.). rev.udcaactual.divulg.cient. [online]. 2008, vol.11, n.2, pp.131-140. ISSN 0123-4226.

In Colombia, no studies of path analysis to maximize the selection progress in passion fruit (Passiflora edulis f. flavicarpa Deg.) breeding have been reported. The objectives of this work were, therefore, to estimate two path analysis, one for weight per fruit and the other one for seed weight with aril under environmental conditions of the city of Montería (Cordoba, Colombia). Genetic and phenotypic correlations obtained from the analysis of 400 fruits, collected from ten commercial lots, ten plants/lot and four fruits/plant (repetitions) were used under a hierarchical design with plants within lot and fruits within plant. Path analysis for weight per fruit showed that the direct effects were positive and 2.28 to 16.50 times, compared to indirect effects, when phenotypic correlations were used and, 1.93 to 6.90 times, when genetic correlations were employed. Peel weight was the variable that caused the largest direct effect on fruit weight. Path analysis for seed weight with aril, when the phenotypic or genetic correlations were used, showed that in fruit weight the direct effects were 3.2 to 80 times, compared to indirect effects. Fruit weight was the variable that showed the largest direct effect on seed weight with aril. The indirect effects through fruit weight were higher than the direct effects within the other variables. Fruit weight can be used as selection criteria for obtention of passion fruit cultivars of high pulp yield.

Keywords : Path coeficient; fruit weight; weight of seed with aril; plant breeding.

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