Black rot is a destructive disease that affects B. oleracea crops, causing significant losses to growers throughout the world. The purpose of this study was to screen out new sources resistant to Xanthomonas campestris pv. campestris race 4 (Xcc4) in 26 cauliflower and six related wild species, and to assess the inheritance of resistance. The results indicate that most of the tested accessions were susceptible or had intermediate resistance, except the Boc4601 (a cauliflower stable inbred line) and PI435896, UNICT5168, and UNICT5169 (wild accessions). Among them, UNICT5169 (Brassica montana) and PI435896 (Brassica balearica) showed the strongest resistance to Xcc4, with significantly lower disease index (DI), area of the infected part (AIP) and proportion of the infected part to the total leaf area (PTL) values. UNICT 5169 was selected as an Xcc4-resistant parent because of its relatively good cross seed-setting rate with cauliflower cultivars. F₁ hybrids were successfully produced between this wild resistant accession (UNICT 5169) and one susceptible cauliflower breeding line (Boc3202-4), indicating the potential transferability of this resistance to cauliflower. The results of the symptoms severity evaluation of the F₂ population indicate that Xcc4 resistance in UNICT5169 is a quantitative trait, which guides future resistance gene location and black rot resistance breeding.

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野生芸苔属植物的黑腐病抗性鉴定及其对花椰菜的潜在转移能力

黑腐病是一种破坏性疾病，会影响油菜双歧杆菌作物，给全世界的种植者造成重大损失。这项研究的目的是筛选出抗黄单胞菌PV的新来源。campestris种族4（Xcc 4）在26个花椰菜和6个相关野生物种中，并评估了抗性的遗传。结果表明，除了Boc4601（花椰菜稳定的近交系）和PI435896，UNICT5168和UNICT5169（野生种）外，大多数测试种都易感或具有中等抗性。其中，UNICT5169（芸苔属蒙大拿）和PI435896（芸苔属巴利阿里）显示最强抗性XCC如图4所示，病虫害指数（DI），感染部位的面积（AIP）和感染部位相对于总叶面积（PTL）值的比例明显降低。选择UNICT 5169作为抗Xcc 4的亲本，是因为它与花椰菜品种的杂交结实率相对较高。在该野生抗性登录号（UNICT 5169）和一个敏感的花椰菜育种系（Boc3202-4）之间成功产生了F ₁杂种，表明该抗性对花椰菜的潜在转移能力。的F的症状的严重程度评价的结果₂人口表明XCC在UNICT5169 4电阻是数量性状，其引导未来抗性基因的位置和黑腐病抗性育种。