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Article

QTL Mapping for Resistance to Early Blight in a Tetraploid Potato Population

1
Department of Plant Breeding, Swedish University of Agricultural Sciences, P.O. Box 101, SE-230 53 Alnarp, Sweden
2
Department of Plant Protection Biology, Swedish University of Agricultural Sciences, P.O. Box 102, SE-230 53 Alnarp, Sweden
*
Author to whom correspondence should be addressed.
Agronomy 2020, 10(5), 728; https://doi.org/10.3390/agronomy10050728
Received: 24 March 2020 / Revised: 13 May 2020 / Accepted: 14 May 2020 / Published: 19 May 2020
(This article belongs to the Section Crop Breeding and Genetics)
Early blight of potato, caused by Alternaria solani, is an economically important foliar disease in most potato-growing regions. Growing cultivars with higher levels of resistance to early blight can reduce tuber yield losses and the need for fungicide applications. In this research, a bi-parental tetraploid potato population, segregating for resistance to early blight in leaves and tubers, was characterized to identify novel quantitative trait loci (QTL) associated with foliar and tuber early blight resistance. Assessment of the disease resistance in the foliage was performed by field evaluation and in tuber under controlled conditions. Results from this study revealed significant differences (P < 0.001) in resistance to A. solani among potato clones both in the leaves and in tubers. There was no statistically significant correlation (r = 0.06, P = 0.35) between the resistance scores from leaves and tubers. Several clones exhibited; however, high levels of resistance both in leaves and tubers and are; thus, promising candidates for breeding for early blight resistance. Linkage mapping revealed several QTL for early blight affecting both foliage and tubers. QTL associated with disease resistance in the tuber were found on chromosomes 1, 2, 3, 4, 8, 11 and 12. QTL associated with disease resistance in foliage were also examined for independence from defoliation, and independent QTL were; thus, found on chromosomes 5 and 11. View Full-Text
Keywords: Alternaria solani; crossed population; QTL tuber resistance; early blight Alternaria solani; crossed population; QTL tuber resistance; early blight
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MDPI and ACS Style

Odilbekov, F.; Selga, C.; Ortiz, R.; Chawade, A.; Liljeroth, E. QTL Mapping for Resistance to Early Blight in a Tetraploid Potato Population. Agronomy 2020, 10, 728. https://doi.org/10.3390/agronomy10050728

AMA Style

Odilbekov F, Selga C, Ortiz R, Chawade A, Liljeroth E. QTL Mapping for Resistance to Early Blight in a Tetraploid Potato Population. Agronomy. 2020; 10(5):728. https://doi.org/10.3390/agronomy10050728

Chicago/Turabian Style

Odilbekov, Firuz, Catja Selga, Rodomiro Ortiz, Aakash Chawade, and Erland Liljeroth. 2020. "QTL Mapping for Resistance to Early Blight in a Tetraploid Potato Population" Agronomy 10, no. 5: 728. https://doi.org/10.3390/agronomy10050728

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