Phenotypic adaptability and stability of herbaceous cotton genotypes in the Semiarid region of the Northeast of Brazil

ABSTRACT Cotton (Gossypium hirsutum L.) crop areas in the Northeast region of Brazil present high edaphoclimatic variability, which contributes to a strong genotype versus environment interaction (G × E). This situation requires the use of adaptability and stability methodologies to study G × E interaction before the selection and recommendation of cultivars. Among these methodologies, the genotype + G × E (GGE) biplot analysis has been currently used and highly recommended. Thus, the objective of this study was to evaluate the G × E of cotton genotypes through GGE biplot analysis, focusing on the identification of adapted and stable genotypes for the Semiarid region of the Northeast of Brazil. Four crop value and use tests were conducted in the municipalities of Apodi, state of Rio Grande do Norte, and Barbalha, state of Ceará, Brazil, in 2016 and 2017. A randomized block experimental design, with 17 treatments and four repetitions, was used. The treatments consisted of 17 cotton genotypes. The variables evaluated were: cotton seed and fiber yields. According to the analysis, the genotypes CNPA BA 2011-4436, CNPA BA 2011-1197, and CNPA BA 2010-1174 were stable and presented high adaptability to the evaluated region.

摘要 巴西东北部地区的陆地棉（Gossypium hirsutum L.）种植区存在显著的土壤气候变异性，这会引发强烈的基因型-环境互作（G × E）。该情况要求在开展品种选育与推广前，采用适应性与稳定性分析方法对G×E互作展开研究。其中，基因型+G×E（Genotype + Genotype × Environment，GGE）双标图分析目前已得到广泛应用并被高度推荐。本研究旨在通过GGE双标图分析法评估棉花基因型的G×E互作，重点筛选适配巴西东北部半干旱区域的适应性强且稳定性佳的棉花基因型。2016年至2017年，本研究在巴西北里奥格兰德州阿波迪市与塞阿拉州巴尔巴利亚市共开展了4项作物价值与利用试验。试验采用随机区组试验设计，设置17个处理（即17个棉花基因型），重复4次。测定的性状为棉籽产量与纤维产量。分析结果显示，基因型CNPA BA 2011-4436、CNPA BA 2011-1197以及CNPA BA 2010-1174稳定性良好，且对供试区域表现出较高的适应性。