Evaluation of papaya genotypes using agronomic descriptors and estimation of genetic parameters

Abstract

ABSTRACT:In Brazil, the improvement of papaya agribusiness is correlated to the estimation of genetic parameters and evaluation of agronomic descriptors; thus enabling less favourable areas for the development and implementation of papaya crops. Therefore, the current study aimed to evaluate quantitative descriptors and to estimate genetic parameters in genotypes of papaya grown under subtropical climate in the state of São Paulo. The experimental design was randomized in block. The experimental units were grouped into seven blocks of five plants each and three treatments, which consisted of three different varieties: Sunrise Solo, Tainung nº1 and local. The psychochemical properties were analysed for plant height; intersection height of first fruits; stem diameter; male, female and hermaphroditic flower percentage; fruit number per plant; production; yield; normal fruits percentage, carpeloid and pentandric fruits; pulp matter; pulp length; pulp diameter; pulp shape; pulp cavity; pulp thickness; peel performance; pulp performance; seeds performance; seeds number; soluble solids; pH; titratable acidity; ratio; technological index; ascorbic acid and reducing sugars. Furthermore, most agronomic descriptors showed high heritability; besides that, the varieties Sunrise Solo and Tainung nº1 performed the best results in Botucatu.

Selección de plantas élites de lechosa ‘Maradol’ para la producción de semillas de calidad

“…Andromonoecious lines are the best medium to maintain the supply of pure seeds, which will give uniform trees in the plantations, adopting the method of bagging the flower buds before anthesis occurs, unless the plants are isolated (Storey, 1978). Also, the selection of segregating populations can reveal big possibilities of success, due to the big variability of genotypes and high heritability values (Silva et al, 2017;Silva et al, 2018). andromonoicas son el mejor medio para mantener el abastecimiento de semillas puras, que darán árboles uniformes en las plantaciones, adoptando el método de embolsado de los botones florales antes que ocurra la antesis, a menos que las plantas se encuentren aisladas (Storey, 1978).…”

“…andromonoicas son el mejor medio para mantener el abastecimiento de semillas puras, que darán árboles uniformes en las plantaciones, adoptando el método de embolsado de los botones florales antes que ocurra la antesis, a menos que las plantas se encuentren aisladas (Storey, 1978). Además, la selección de poblaciones segregantes pueden revelar grandes posibilidades de éxito, debido a la gran variabilidad de genotipos y altos valores de heredabilidad (Silva et al, 2017;Silva et al, 2018).…”

“…These qualitative characteristics were similar to the population of the Tucutunemo Valley that gave rise to them. Alonso et al (2009) mention that the typical fruits of the Maradol cultivar would be elongated, however, consumers and producers also prefer cylindrical and piriform forms with a smaller internal cavity than that produced by the fruits of female plants and therefore of higher value of the market due to its weight and resistance to handling (Silva et al, 2018).…”

“…Estas características cualitativas fueron similares a la población de procedencia del Valle de Tucutunemo que les dio origen. Alonso et al (2009) mencionan que los frutos típicos del cultivar Maradol serían elongados, sin embargo, los consumidores y productores también prefieren las formas cilíndricas y piriformes con una cavidad interna menor que la producida por los frutos de las plantas femeninas y por lo tanto de mayor valor de mercado por su peso y resistencia al manejo (Silva et al, 2018).…”

“…En ambas referencias se usaron los descriptores de papaya del IBPGR, pero los materiales evaluados fueron de muy diversos tipos. En nuestra investigación, los resultados indicaron una alta variabilidad en algunas de las características due to the high correlation between the phenological and production features, the high heritability of some of the characteristics and the inherent phenotypic plasticity in terms of sex, flowers and fruits that the papaya presents, as the reported by Kaluran et al (2018) and Silva et al (2018).…”