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Germplasm Enhancement and Identification of Loci Conferring Resistance against Plasmodiophora brassicae in Broccoli

文献类型： 外文期刊

作者： Xie, Qi 1 ; Wei, Xiaochun 2 ; Liu, Yumei 1 ; Han, Fengqing 1 ; Li, Zhansheng 1 ;

作者机构： 1.Chinese Acad Agr Sci, Inst Vegetables & Flowers, Key Lab Biol & Genet Improvement Hort Crops, Beijing 100081, Peoples R China

2.Henan Acad Agr Sci, Inst Hort, Zhengzhou 450002, Peoples R China

关键词： Plasmodiophora brassicae; clubroot; broccoli; germplasm enhancement; breeding

期刊名称：GENES （ 影响因子：4.141； 五年影响因子：4.474 ）

ISSN：

年卷期： 2022 年 13 卷 9 期

页码：

收录情况： SCI

摘要： In order to breed broccoli and other Brassica materials to be highly resistant to clubroot disease, 41 Brassicaceae varieties were developed and identified between 2020 and 2021. Seven known clubroot genes were used for screening these materials. In addition, the resistant and susceptible broccoli cultivars were designed for observing their differences in the infection process with Plasmodiophora brassicae. The results showed that 90% of total materials had carried more than two clubroot resistance genes: one material carried two disease resistance genes, four materials carried seven genes for clubroot resistance, two materials carried six genes for clubroot resistance, and in total 32% of these materials carried five genes for clubroot resistance. As a result, several new genotypes of Brassicaceae germplasm were firstly created and obtained based on distant hybridization and identification of loci conferring resistance against Plasmodiophora brassicae in this study. We found and revealed that similar infection models of Plasmodiophora brassicae occurred in susceptible and resistant cultivars of broccoli, but differences in infection efficiency of Plasmodiophora brassicae also existed in both materials. For resistant broccoli plants, a small number of conidia formed in the root hair, and only a few spores could enter the cortex without forming sporangia while sporangia could form in susceptible plants. Our study could provide critical Brassica materials for breeding resistant varieties and new insight into understanding the mechanism of plant resistance.

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