Abstract
Despite the negative impact of common scab (Streptomyces spp.) on the potato industry, little is known about the genetic architecture of resistance to this bacterial disease in the crop. We evaluated a mapping population (∼150 full sibs) derived from a cross between two tetraploid potatoes ('Atlantic' × B1829-5) in three environments (MN11, PA11, ME12) under natural common scab pressure. Three measures to common scab reaction, namely percentage of scabby tubers and disease area and lesion indices, were found to be highly correlated (>0.76). Because of the large environmental effect, heritability values were zero for all three traits in MN11, but moderate to high in PA11 and ME12 (∼0.44 to 0.79). We identified a single quantitative trait locus (QTL) for lesion index in PA11, ME12, and joint analyses on linkage group 3, explaining ∼22 to 30% of the total variation. The identification of QTL haplotypes and candidate genes contributing to disease resistance can support genomics-assisted breeding approaches in the crop.[Formula: see text] Copyright © 2021 The Author(s). This is an open access article distributed under the CC BY 4.0 International license.
Highlights
Despite the negative impact of common scab (Streptomyces spp.) on the potato industry, little is known about the genetic architecture of resistance to this bacterial disease in the crop
Similar ranges were observed for all evaluated traits across environments, reaction to common scab in PA11 and ME12 was skewed toward more severe phenotypes, whereas MN11 behaved in the opposite direction, toward resistance (Fig. 1A to C)
The mapping population mean of percentage of scabby tubers (PS) was only 18.88% in MN11, but 91.64 and 81.15% in PA11 and ME12, respectively (Table 1)
Summary
Despite the negative impact of common scab (Streptomyces spp.) on the potato industry, little is known about the genetic architecture of resistance to this bacterial disease in the crop. Common scab is characterized by brownish superficial, raised, or pitted lesions on tuber surfaces, where the phytotoxin Thaxtomin A produced by pathogenic Streptomyces spp. plays an important role (Kinkel et al 1998; Loria et al 1995). This disease is highly influenced by the environment (Haynes et al 2010), especially by the soil conditions (Kristufek et al 2015), and by the virulence of the pathogens present in the soil (Clarke et al 2019; Wanner 2006; Wanner and Haynes 2009).
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