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Mapping Loci that Control Tuber and Foliar Symptoms Caused by PVY in Autotetraploid Potato (Solanum tuberosum L.)
Washington Da Silva: Cornell University; Gary Stewart: USDA, Agricultural Research Service; Gary Stewart: Cornell University/USDA-ARS; Walter De Jong: Cornell Univ
<div>Potato tuber necrotic ringspot disease (PTNRD) is a tuber deformity associated with infection by the tuber necrotic strain of potato virus Y (PVY<sup>NTN</sup>). PTNRD negatively impacts tuber quality, marketability, and poses a serious threat to seed and commercial potato production worldwide. PVY<sup>NTN</sup> symptoms differ in the cultivars Waneta and Pike; Waneta expresses severe PTNRD and foliar mosaic with vein and leaf necrosis, whereas Pike does not express PTNRD and mosaic is the only foliar symptom. To map loci that influence tuber and foliar symptoms, 244 F<sub>1</sub> progeny of a cross between Waneta and Pike were inoculated with isolate PVY<sup>NTN</sup>-NY090029 and also genotyped using 12808 Potato SNP markers. Foliar symptom type and severity were monitored for 10 weeks, while tubers were evaluated for PTNRD expression at harvest and again after 60 days in storage. Pairwise correlation analyses indicate a strong association between PTNRD and veinal necrosis (τ = 0.4195). QTL analyses revealed major-effect QTLs on chromosomes IV and V for mosaic, IV for PTNRD, and V for foliar-necrosis symptoms. Locating QTLs associated with PVY-related symptoms provides a foundation for breeders to develop markers that can be used to screen out potato clones with undesirable phenotypes, e.g., those likely to develop PTNRD or to be symptomless carriers of PVY.</div>

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