Qualidade pós-colheita de pêssegos de cultivares e seleções produzidos na microrregião de Jaboticabal-SP

Abstract

RESUMO -O objetivo deste trabalho foi avaliar a qualidade pós-colheita de pêssegos das cultivares 'Aurora-1' e 'Régis' e das seleções 'Jab 484' e 'Jab 694', produzidos na microrregião de Jaboticabal-SP. As plantas foram enxertadas no porta-enxerto 'Okinawa', propagado por sementes, mantidas em condições de campo em Argissolo Vermelho-Amarelo eutrófico de textura arenosa média e conduzidas no espaçamento 6 x 4m. No segundo e terceiro anos após o transplantio das mudas (2005 e 2006), procedeu-se à colheita dos frutos no estádio maduro, conforme a época de maturação e a coloração de cada genótipo. No laboratório, foram realizadas análises de coloração (luminosidade, ângulo de cor e cromaticidade) do epicarpo e mesocarpo, firmeza, teor de sólidos solúveis e acidez titulável, além do índice de maturação. Adotou-se o delineamento experimental inteiramente casualizado, com quatro tratamentos e seis repetições de quatro frutos. Nas condições experimentais adotadas, conclui-se que os frutos da cultivar Aurora-1 apresentam epicarpo avermelhado (menor ângulo de cor), menor acidez e maior índice de maturação (gosto); dentre os genótipos de dupla finalidade, as seleções 'Jab 484' e 'Jab 694' apresentam frutos com maiores teores de sólidos solúveis e acidez titulável, conferindolhes melhor característica para a industrialização. Termos para indexação: Prunus persica, dupla finalidade, in natura, coloração, composição química. POSTHARVEST PEACH QUALITY OF CULTIVARS AND SELECTIONS PRODUCED IN JABOTICABAL MICRO-REGION, SÃO PAULO STATE, BRAZILABSTRACT -The objective of this research was to evaluate the postharvest peach quality of 'Aurora-1' and 'Regis' cultivars and 'Jab 484' and 'Jab 694' peach selections, produced in the Jaboticabal micro-region, São Paulo State, Brazil. Plants had been budded on 'Okinawa' seedlings, cultivated in Hapludalfs soil with sandy medium texture at 6 x 4m space. In the second and third year after transplant (2005 and 2006), ripe fruits were harvested, according to peel coloration and maturation of each genotype. At laboratory, epicarp and mesocarp coloration analyses had been carried out (luminosity, hue and cromaticity), firmness, soluble solids, acidity and ratio. The experiment was conducted in a completely randomized design with 4 treatments and 6 replications of 4 fruits. On the experimental conditions adopted, it was possible to conclude that: a) 'Aurora-1' peaches present reddish epicarp (lesser hue), minor acidity and greater ratio; b) amongst double purpose peach genotypes, 'Jab 484' and 'Jab 694' present fruits with the biggest soluble solid contents and acidity, what confers better industrialization characteristics.

Color Shade Heritability of Peach Flesh

“…These values obtained for h ab corroborate with those found by Corrêa (2007), who, when analyzing progenies of yellow-flesh peaches, observed h ab values between 75 and 89°. They are also in agreement, but with a wider range, with the average values obtained by Mayer et al (2008), who studied four genotypes of yellow-flesh peaches and found h ab values between 90 and 100°. The highest values were obtained in progenies of white-flesh peaches, with a minimum value of 44.17° and maximum of 112.43° (Table 2).…”

Influence of the Period of Peach Tree Chemical Thinning on Fruit Quality

“…Likewise, other studies of chemical thinning agents in peach trees did not find any changes in fruit color (Rodrigues et al, 1999). Changes in peach color are directly related to the genotype (Mayer et al, 2008), fruit ripening stage (Mathias et al, 2008), green pruning management (Gonçalves et al, 2014), amount of plant available water and the relation between fruits and sunlight (Alcobendas et al, 2013). Note.…”

PHYSIOLOGICAL AND SENSORIAL ASPECTS OF PEACH FRUITS cv. Chimarrita DEPENDING ON THE SEASON AND MANAGEMENT OF GREEN PRUNING

“…The relationship between soluble solids and acidity may indicate flavor, showing the best palatability for in natura consumption (MAYER et al, 2008). For this relation, the highest values were recorded with the folding management of the branches (Table 4).…”

“…In part this can be proven by the water conductance values, which were higher in these treatments, which facilitated the flow of the sap inside these plants, using the sugars more quickly by the fruits (Table 4). The relationship between soluble solids and acidity may indicate flavor, showing the best palatability for in natura consumption (MAYER et al, 2008). For this relation, the highest values were recorded with the foliar management of the branches (Table 4).…”