Genotype x environment interaction, adaptability and stability of ‘Piel de Sapo’ melon hybrids through mixed models

Abstract The aim of this study was to evaluate the genotypic performance of twelve Piel de Sapo melon hybrids in the Mossoró-Assú agricultural region, state of Rio Grande do Norte, Brazil, using mixed models. Adaptability and stability of the predicted genotypic values were studied by the Harmonic Mean of the Relative Performance of Genotypic Values (HMRPGV) procedure. The traits evaluated were yield (Mg ha-1) and soluble solids content (ºBrix). The genotype x environment interaction was significant for the two variables in all the hybrid groups evaluated, with predominance of the complex part of the interaction, and this makes the selection process more difficult. Considering the genotypic values predicted, the HMRPGV method allowed identification of hybrids with greater genotypic adaptability and stability. The experimental hybrids HP-09 and HP-06 were more promising for growing in the Mossoró-Assú agricultural region since they have high stability and adaptability, as well as high yield and soluble solids.

摘要 本研究旨在利用混合模型，评估巴西北里奥格兰德州莫索罗-阿苏农业产区12个皮耶尔萨波（Piel de Sapo）甜瓜杂交品种的基因型表现。采用基因型值相对性能谐波均值（Harmonic Mean of the Relative Performance of Genotypic Values，简称HMRPGV）分析法，研究预测基因型值的适应性与稳定性。本试验评估的性状为产量（Mg·ha⁻¹）与可溶性固形物含量（°Brix）。基因型-环境互作在所有评估杂交组的两个性状上均达显著水平，且互作以复杂组分为主，这使得品种选育过程更为困难。基于预测得到的基因型值，HMRPGV方法可筛选出基因型适应性与稳定性更优的杂交品种。试验杂交品种HP-09与HP-06在莫索罗-阿苏农业产区的种植前景更佳，因其兼具高稳定性与适应性，且产量与可溶性固形物含量均表现优异。