Quantitative Trait Loci for Resistance to Potato Dry Rot Caused by Fusarium sambucinum

Sylwester Sobkowiak,Iwona Wasilewicz-Flis,Marta Janiszewska,Emil Stefańczyk,Jadwiga Śliwka

doi:10.3390/agronomy12010203

Abstract

Tuber dry rot is an important disease of potato caused by soil and seed-borne pathogens of the Fusarium genus leading to losses that may reach 60% of the yield. The goal of this work was to study the inheritance of the dry rot resistance in two diploid potato hybrid populations (11–36 and 12–3) with complex pedigrees, including several wild Solanum spp. We used an aggressive isolate of F. sambucinum for phenotyping both progenies, parents, and standard potato cultivars in laboratory tuber tests, in three subsequent years. The QTL for dry rot resistance were mapped by interval mapping on existing genetic maps of both mapping populations. The most important and reproducible QTL for this trait was mapped on chromosome I and additional year- and population-specific QTL were mapped on chromosomes II, VII, IX, XI, and XII, confirming polygenic control of this resistance. This is the first study mapping the loci affecting tuber dry rot resistance in potato genome that can contribute to better understanding of potato-F. sambucinum interaction and to more efficient breeding of resistant potato cultivars.

Highlights

Potato (Solanum tuberosum L.) is the third most important humans’ food crop, with global annual production of 359 million tons
The parental forms of both populations resulted from a recombinant breeding program at IHARPIB that included in their pedigree a number of Solanum species: S. tuberosum, S. acaule, S. chacoense, S. demissum, S. gourlayi, S. microdontum, S. phureja, S. stenotomum, S. verrucosum, and S. yungasense
The parents of the population 11–36 differed strongly in their tuber dry rot resistance evaluated in a laboratory tuber test with F. sambucinum isolate MF1 (Table 1)

Summary

Introduction

Potato (Solanum tuberosum L.) is the third most important humans’ food crop, with global annual production of 359 million tons (data from 2020, FAOSTAT http://www.fao.org/faostat/en/#data, accessed on 13 October 2021). Potato (Solanum tuberosum L.) is the third most important humans’ food crop, with global annual production of 359 million tons With more than 70% of water content, potato tubers are vulnerable to many diseases and rots which contribute to food losses and waste occurring at all stages from field to fork. 1/3 (1.3 billion tons) of the global food production Tuber dry rot is an important disease of potato caused by soil and seed-borne pathogens of the Fusarium genus. These ascomycetes can infect tubers in the field, but the disease develops mainly in the storage, leading to losses that may reach 60% of the yield [1].

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