Reaction of Cauliflower Genotypes to Black Rot of Crucifers

Abstract

This study aimed to evaluate six cauliflower genotypes regarding their resistance to black rot and their production performance. To do so, it was conducted two field experiments in Ipameri, Goiás, Brazil, in 2012 and 2013. It was used a randomized block design, with four replications (total of 24 plots). Each plot consisted of three planting lines 2.5 m long (six plants/line), spaced 1.0 m apart, for a total area of 7.5 m2. Evaluations of black rot severity were performed at 45 days after transplanting, this is, 75 days after sowing (DAS), and yield evaluations at 90 to 105 DAS. The Verona 184 genotype was the most resistant to black rot, showing 1.87 and 2.25% of leaf area covered by black rot symptom (LACBRS) in 2012 and 2013. However, it was not among the most productive materials. The yield of the genotypes varied between 15.14 and 25.83 t/ha in both years, Lisvera F1 (21.78 and 24.60 t/ha) and Cindy (19.95 and 23.56 t/ha) being the most productive. However, Lisvera F1 showed 6.37 and 9.37% of LACBRS and Cindy showed 14.25 and 14.87% of LACBRS in 2012 and 2013, being both considered as tolerant to black rot.

Advances in Multi-Omics Approaches for Molecular Breeding of Black Rot Resistance in Brassica oleracea L.

“…So, for durable resistance, accessions with broad-spectrum and race non-specific resistance are desirable (Taylor et al, 2002). In cauliflower, several race non-specific resistance sources have been identified (Sharma et al, 1972(Sharma et al, , 1977(Sharma et al, , 1995(Sharma et al, , 2003Pandey et al, 2003;da Silva et al, 2015;Chatterjee et al, 2018). Also, in the ' A' and 'B' genomes of Brassica species, several durable resistance sources against Xcc have been reported (Westman et al, 1999;Taylor et al, 2002;Vicente and Holub, 2013;Dey et al, 2015;Lema et al, 2015;Sharma et al, 2016).…”