Common bacterial blight (CBB) caused by Xanthomonas axonopodis pv. phaseoli and X. axonopodis pv. phaseoli var. fuscans is one of the major biotic constraints limiting common bean (Phaseolus vulgaris L.) production and productivity in Ethiopia. The objective of this study was to identify new sources of CBB resistance from a diverse panel of genotypes to develop CBB‐resistant common bean varieties. One hundred and ten diverse accessions were evaluated for CBB resistance at three hotspot sites (Melkassa, Arsi Negelle and Mieso) for two seasons (2017 and 2018) in Ethiopia. Data on mean disease severity on leaf (SL) and mean disease severity on pod (SP), the area under disease progress curve (AUDPC), number of pods per plant (PP), number of seeds per pod (SPP) and grain yield (GY) were collected. Data were subjected to standard analysis of variance and principal component analysis. The genotype × site interaction (G × E) had significant (p < .05) effect on all assessed traits. This indicated the presence of marked variation among tested genotypes in CBB resistance across the testing sites. Genotypes including SEC21, SEC23, SMC21, VAX6, SEC12, SEC25, SMC22, VAX5, SEC20, SEC22, SEC24, SEC26, SMC16 SMC24, VAX6, SEC25, SEC21, SEC23 and SMC21 exhibited lower values of SL, SP and AUDPC which are useful genetic resources for future CBB resistance breeding programmes. Nasir provided a grain yield of 3.45 ton/ha followed by VAX1 (2.86 ton/ha) and Hawassa Dume (2.83 ton/ha). Further, CBB‐resistant and high yielding genotypes had the higher PPP and SPP making them ideal candidates for common bean breeding in Ethiopia or similar agro‐ecologies emphasizing CBB resistance and enhanced agronomic traits.

中文翻译：

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鉴定埃塞俄比亚普通豆类对白叶枯病的抗性来源

黄褐线虫xv引起的常见细菌性疫病。菜豆和X. axonopodis pv。菜豆变种 fuscans是限制普通豆（菜豆）的主要生物限制之一L.）的生产和生产力在埃塞俄比亚。这项研究的目的是从多种基因型中鉴定出CBB抗性的新来源，以开发出具有CBB抗性的普通豆品种。在埃塞俄比亚的两个热点地区（Melkassa，Arsi Negelle和Mieso）对两个季节（2017年和2018年）的110种不同种质的CBB抗性进行了评估。叶片平均病害严重程度（SL）和荚果平均病害严重程度（SP），疾病进程曲线下面积（AUDPC），单株荚果数量（PP），单荚果种子数量（SPP）和谷物产量的数据（GY）被收集。对数据进行方差的标准分析和主成分分析。基因型×部位相互作用（G×E）显着（p <.05）对所有评估特征的影响。这表明在测试位点之间，在测试基因型之间，CBB抵抗力存在显着差异。包括SEC21，SEC23，SMC21，VAX6，SEC12，SEC25，SMC22，VAX5，SEC20，SEC22，SEC24，SEC26，SMC16 SMC24，VAX6，SEC25，SEC21，SEC23和SMC21在内的基因型表现出较低的SL，SP和AUDPC值未来CBB抗性育种计划的遗传资源。Nasir提供的谷物产量为3.45吨/公顷，其次是VAX1（2.86吨/公顷）和Hawassa Dume（2.83吨/公顷）。此外，耐CBB和高产基因型的PPP和SPP较高，使其成为埃塞俄比亚或强调CBB抗性和增强农艺性状的类似农业生态育种的理想人选。