ABSTRACT

Multivariate analyzes such as selection indexes are one of the ways to select superior papaya genotypes with adequate quality to the consumer market, becoming more efficient after inferences made in the population from the estimate of genetic parameters. Thus, this study aimed to estimate genetic parameters and select papaya topcross hybrids for traits related to fruit quality through selection indexes. The analysis of variance was performed, and the genetic parameters and means test were estimated. The indexes of Smith and Hazel, Pesek and Baker, Mulamba and Mock, and Williams were applied to determine the genetic gains. The genetic parameters indicated a greater environmental influence for firmness, and soluble solids content, where the fruit weight presented the highest genetic variation. The selection showed a reduction in gains for at least one of the essential traits in the quality of the fruits, such as fruit and pulp firmness, soluble solids content, or pulp volume percentage. The Mulamba and Mock index demonstrated satisfactory gains for all these traits with minimal reduction in the others, which is considered the most appropriate for the selection of eight papaya hybrids (UCHJ16-014, UCHJ16-034, UCHJ16-006, UCHJ16-026, UCHJ16-013, UCHJ16-012, UCHJ16-025, and UCHJ16-016).

摘要

选择指数等多变量分析是为消费市场选择具有足够质量的优质番木瓜基因型的方法之一，在从遗传参数估计中对人群进行推断后变得更加有效。因此，本研究旨在通过选择指标估计遗传参数并选择与果实品质相关性状的番木瓜顶交杂种。进行方差分析，估计遗传参数和均值检验。应用了 Smith 和 Hazel、Pesek 和 Baker、Mulamba 和 Mock 以及 Williams 的指数来确定遗传增益。遗传参数表明，环境对硬度和可溶性固形物含量的影响更大，其中果实重量表现出最高的遗传变异。选择表明，果实质量的至少一项基本性状（例如果实和果肉硬度、可溶性固形物含量或果肉体积百分比）的增益降低。Mulamba 和 Mock 指数对所有这些性状都表现出令人满意的增益，而其他性状的降低最小，这被认为最适合选择 8 个木瓜杂种（UCHJ16-014、UCHJ16-034、UCHJ16-006、UCHJ16-026、UCHJ16 -013、UCHJ16-012、UCHJ16-025 和 UCHJ16-016）。