Abstract
Nowadays, despite of being a typically temperate fruit crop, peach is found in subtropical and even tropical altitude zones, due to breeding efforts. Genetic knowledge and phenotypic and environmental parameters directly or indirectly influence the characters of economic importance in peach, and they are of great importance for breeding programs orientation. The aim of this study was to estimate heritability of a color shade character of peach flesh, measured by the Hue angle, chroma and lightness to evaluate its distribution in the populations, testing the possible existence of maternal effect. Results showed that parameters related to color shade of peach flesh have a medium heritability. Parents selection based on phenotype allows a medium genetic improvement for the mentioned character. This heritability is predominantly additive, without maternal effect. The Hue angle is the correct parameter to be used to classify and study yellow-flesh peaches and nectarines in relation to their color shade. However, the multivariate analysis of principal components, using the three parameters Hue angle, chroma and lightness, is an alternative of high accuracy.
Highlights
Fruit quality attributes are determinant for consumer acceptance and market value, being the flesh color a primary component (Williamson et al, 2006)
Carotenoids and xantophylls give color to the flesh, both are located in the chloroplasts and found in greater quantity in yellow fruits as compared to white fruits
The aim of this study was to estimate the heritability of the color shade character of peach flesh, measured by the Hue angle, chroma and lightness, in the broad and narrow-sense
Summary
Fruit quality attributes are determinant for consumer acceptance and market value, being the flesh color a primary component (Williamson et al, 2006). In fruit commercialization, cultivars are classified in white or yellow-flesh peaches and nectarines (Adami et al, 2013; Raseira et al, 2014). There is a third less known phenotypic group with red flesh (“Red blood flesh”), which has a dominant inheritance character, regardless if the background color is white or yellow (Werner et al, 1998; Bassi & Monet, 2008). Yellow-flesh cultivars show a β-carotene content between 2 and 3 mg per 100 g of fresh mass, whereas white-flesh cultivars present amounts up to 10 times smaller, varying from 0.01 mg to 1.8 mg per 100 g of fresh mass (Vizzotto et al, 2006; Adami et al, 2013)
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