Print version ISSN 0120-9965
ESPITIA-CAMACHO, Miguel; ARAMENDIZ-TATIS, Hermes and CARDONA-AYALA, Carlos. Correlations for some physical and chemical properties of fruit and juice of passion fruit (Passiflora edulis var. flavicarpa Degener). Agron. colomb. [online]. 2008, vol.26, n.2, pp. 292-299. ISSN 0120-9965.
The objectives of this work were to estimate the phenotypic, genetic and environmental correlations, among 16 agronomic traits in passion fruit, analyze the effect of five sample sizes (20, 40, 60, 80 and 100%) in the estimation of correlations and calculate the canonical correlations among two properties of fruit with three ones of juice under the environmental conditions of Montería (Córdoba, Colombia). Ten commercial lots, in each of these 10 plants and four fruits on each plant (repetitions) were selected. The data were analyzed under a hierarchical design with plants within lots and fruits within plants. The results indicated that the genetic correlations were higher (magnitude and significance) than the phenotypic and environmental correlations. The weight per fruit (PFR) presented positive and high genetic correlation (r>0.78) with the weight of shell (PCA), weight of seed with aril (PSC) and weight of the seed without aril (PSA). The index of fruit maturity (INM) presented a direct genetic correlation with Brix degrees (GBR: r = 0.61) and inverse one with the acidity of juice (ACJ: r = -0.85). The estimate of correlation coefficients for the five sample sizes used showed that mean values were very similar (r = 0.80 to 0.84). When the genetic correlations were used, the first canonical correlation explained 88.37% of the total variation and was significant (r = 0.60). The canonical coefficients indicate that the selection of fruits with more PFR increases the PSC and ACJ.
Keywords : canonical coefficients; sample size; soluble solids; acidity.