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ARS Home » Northeast Area » Beltsville, Maryland (BARC) » Beltsville Agricultural Research Center » Genetic Improvement for Fruits & Vegetables Laboratory » Research » Publications at this Location » Publication #379310
Research Project: Potato and Other Solanaceous Crop Improvement and Disease Management

Location: Genetic Improvement for Fruits & Vegetables Laboratory

Title: Quantitative trait locus mapping for common scab resistance in a tetraploid potato full-sib population

Author
item PEREIRA, GUILHERME DA S - International Potato Centre
item MOLLINARI, MARCELO - North Carolina State University
item ZENG, ZHAO-BANG - North Carolina State University
item YENCHO, CRAIG - North Carolina State University
item QU, XINSHUN - Pennsylvania State University
item HAYNES, KATHLEEN - Retired ARS Employee
item THILL, CHRISTIAN - University Of Minnesota

Submitted to: Plant Disease
Publication Type: Peer Reviewed Journal
Publication Acceptance Date: 3/9/2021
Publication Date: 11/11/2021
Citation: Pereira, G., Mollinari, M., Zeng, Z., Yencho, C.G., Qu, X., Haynes, K.G., Thill, C. 2021. Quantitative trait locus mapping for common scab resistance in a tetraploid potato full-sib population. Plant Disease. https://doi.org/10.1094/PDIS-10-20-2270-RE.
DOI: https://doi.org/10.1094/PDIS-10-20-2270-RE

Interpretive Summary: Common scab is a serious soil-borne disease of potato tubers, resulting in superficial, raised, or sunken lesions. Little is known about the genetic basis of resistance to this disease. Potatoes must be evaluated for several years in different environments before resistance can be identified with certainty. In this study we evaluated a population of potatoes segregating for resistance to common scab and using molecular techniques, identified several genes on potato chromosome III that appear to govern resistance. This information will be useful to potato breeders and plant pathologists in developing molecular markers for marker-assisted selection for resistance, which should result in faster breeding progress for resistance.

Technical Abstract: Despite the negative impact of common scab (Streptomyces scabies) to 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, and ME12) under natural common scab pressure. Three measures to common scab reaction were assessed, namely proportion of scabby tubers, and area and lesion indices, which were highly correlated (>0.76). Due to large environmental effect, heritability values were zero for all traits in MN11, but moderate to high in PA11 and ME12 (0.44~0.79). We identified a single quantitative trait locus (QTL) for lesion index in PA11, ME12 and joint analyses on linkage group 3, explaining 22~30% of the total variation. The identification of QTL haplotypes and candidate genes contributing to resistance can support potential genomics-assisted breeding approaches.