Common bacterial blight (CBB) of mungbean (Vigna radiata [L.] Wilczek var. radiata) is a major limitation to mungbean production in semi-arid areas of the world where mungbean is a major crop. Deployment of resistant varieties is a significant sustainable strategy for controlling CBB in marginal production systems. The objective of this study was to identify sources of resistance and the stability of mungbean landraces to CBB attack across drought-endemic environments. A total of 240 mungbean genotypes were evaluated for CBB resistance and performance of agronomic traits in an alpha lattice design at four locations for 2 years (2019, 2020). Data were subjected to residual maximum likelihood (REML) analysis to partition variance components attributed to main effects and interactions, respectively. REML analysis revealed significant main effects for genotype, environment (combination of cropping season and location) and genotype-by-environment interaction (p < 0.01), demonstrating the influence of environment on genotypic expression. A genotype main effect plus genotype-by-environment biplot was used to analyse the multi-location trial data based on CBB score to determine genotypic stability. The GGE analysis demonstrated that the Kambi Ya Mawe location in 2019 was the most suitable environment for the assessment of CBB resistance. Accessions GBK 004852, GBK 004789, GBK 026986, GBK 004970, GBK 004961, GBK 004882 and GBK 043573 were selected as having high and stable resistance across all environments. The identification of high and stable resistance sources is a first step towards deploying resistance in mungbean breeding programmes against CBB and the future deployment of resistant cultivars.

中文翻译：

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绿豆地方品种对半干旱环境中常见细菌性枯萎病的基因型与环境相互作用和抗性稳定性

绿豆（Vigna radiata [L.] Wilczek var. radiata）的普通细菌性枯萎病 (CBB) 是世界半干旱地区绿豆生产的主要限制因素，其中绿豆是主要作物。部署抗性品种是在边际生产系统中控制 CBB 的重要可持续策略。本研究的目的是确定绿豆地方品种在干旱流行环境中对 CBB 攻击的抗性来源和稳定性。在 2 年（2019 年、2020 年）的四个地点，在 alpha 格子设计中评估了总共 240 个绿豆基因型的 CBB 抗性和农艺性状性能。对数据进行残差最大似然 (REML) 分析，以分别划分归因于主效应和交互作用的方差分量。REML 分析揭示了基因型、环境（种植季节和地点的组合）和基因型与环境的相互作用（p < 0.01）的显着主要影响，证明了环境对基因型表达的影响。使用基因型主效应加基因型-环境双标图来分析基于 CBB 评分的多地点试验数据，以确定基因型稳定性。GGE 分析表明，2019 年的 Kambi Ya Mawe 位置是评估 CBB 抗性的最合适环境。种质 GBK 004852、GBK 004789、GBK 026986、GBK 004970、GBK 004961、GBK 004882 和 GBK 043573 被选为在所有环境中具有高且稳定的抗性。