Centre for Plant Genetics and Breeding, UWA, School of Agriculture and Environment and the UWA Institute of Agriculture, The University of Western Australia, WA, 6009, Australia.
School of Agriculture and Environment and the UWA Institute of Agriculture, The University of Western Australia, WA, 6009, Australia.
Plant Dis. 2019 Nov;103(11):2884-2892. doi: 10.1094/PDIS-03-19-0664-RE. Epub 2019 Sep 5.
and are two of the most important pathogens of many cruciferous crops. The reaction of 30 genotypes of (false flax) was determined against both pathogens. genotypes were inoculated at seedling and adult stages with two pathotypes of , highly virulent MBRS-1 and less virulent WW-1. There were significant differences ( < 0.001) among genotypes, between pathotypes, and a significant interaction between genotypes and pathotypes in relation to percent cotyledon disease index (% CDI) and stem lesion length. Genotypes 370 (% CDI 20.5, stem lesion length 1.8 cm) and 253 (% CDI 24.8, stem lesion length 1.4 cm) not only consistently exhibited cotyledon and stem resistance, in contrast to susceptible genotype 2305 (% CDI 37.7, stem lesion length 7.2 cm), but their resistance was independent to pathotype. A F-recombinant inbred line population was developed from genotypes 370 × 2305 and responses characterized. Low broad-sense heritability indicated a complex pattern of inheritance of resistance to . Six isolates of , covering combinations of five different avirulent loci (i.e., five different races), were tested on cotyledons across two experiments. There was a high level of resistance, with % CDI < 17, and including development of a hypersensitive reaction. This is the first report of variable reaction of to different races of and the first demonstrating comparative reactions of to and This study not only provides new understanding of these comparative resistances in , but highlights their potential as new sources of resistance, both for crucifer disease-resistance breeding in general and to enable broader adoption of as a more sustainable oilseed crop in its own right.
和 是许多十字花科作物最重要的病原体之一。测定了 30 个 （假亚麻）基因型对这两种病原体的反应。在幼苗和成虫阶段，用两种致病型 ，高毒力的 MBRS-1 和低毒力的 WW-1 对 基因型进行接种。基因型之间、致病型之间以及基因型与致病型之间在子叶病指数（% CDI）和茎损伤长度上存在显著差异（<0.001）。基因型 370（% CDI 20.5，茎损伤长度 1.8 cm）和 253（% CDI 24.8，茎损伤长度 1.4 cm）不仅表现出对子叶和茎的抗性，与易感基因型 2305（% CDI 37.7，茎损伤长度 7.2 cm）形成对比，而且其抗性与 致病型无关。从基因型 370×2305 中开发了一个 F 重组自交系群体，并对其反应进行了特征描述。低广义遗传力表明，对 的抗性遗传模式复杂。在两个实验中，用 6 个 分离株，涵盖了 5 个不同无毒基因座（即 5 个不同的小种）的组合，对 子叶进行了测试。表现出高水平的抗性，% CDI<17，包括产生过敏反应。这是首次报道 对不同小种的反应不同，也是首次证明 对 和 的比较反应。本研究不仅为 中这些比较抗性提供了新的认识，而且突出了它们作为抗性新来源的潜力，这不仅对十字花科作物的抗性育种具有重要意义，而且使 作为一种更可持续的油料作物本身能够更广泛地采用。
