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Open AccessArticle

Identification of Black Rot Resistance in a Wild Brassica Species and Its Potential Transferability to Cauliflower

Institute of Vegetables, Zhejiang Academy of Agricultural Sciences, Hangzhou 310021, China
Department of Agriculture, Food and Environment, University of Catania, 95124 Catania, Italy
Author to whom correspondence should be addressed.
X.-G.S. and F.B. contribute equally to this work.
Agronomy 2020, 10(9), 1400;
Received: 20 August 2020 / Revised: 3 September 2020 / Accepted: 7 September 2020 / Published: 16 September 2020
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. View Full-Text
Keywords: black rot; Brassica oleracea; resistance; cross-compatibility; genetics black rot; Brassica oleracea; resistance; cross-compatibility; genetics
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Sheng, X.-G.; Branca, F.; Zhao, Z.-Q.; Wang, J.-S.; Yu, H.-F.; Shen, Y.-S.; Gu, H.-H. Identification of Black Rot Resistance in a Wild Brassica Species and Its Potential Transferability to Cauliflower. Agronomy 2020, 10, 1400.

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