QTL for field resistance to late blight in potato are strongly correlated with maturity and vigour

A. Collins, D. Milbourne, L. Ramsay, R. Meyer, C. Chatot-Balandras, P. Oberhagemann, W. De Jong, C. Gebhardt, E. Bonnel, R. Waugh (Lead / Corresponding author)

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121 Citations (Scopus)

Abstract

Field resistance to Phytophthora infestans, the causal agent of foliage and tuber blight in cultivated potatoes, earliness (maturity) and vigour, were examined in a diploid segregating potato population grown in replicated trials over three consecutive growing seasons. A genetic linkage map of this population was constructed in parallel using PCR-based SSR, AFLP and CAPS markers. Analysis of the trait scores alongside the marker segregation data allowed the identification of regions of the genome which were significantly correlated with components of the respective characters. The most significant associations for all four traits were with marker alleles on potato linkage group V originating from the male (susceptible) parent. In the case of foliage resistance to late blight, the positions of the majority of the effects, which were located on eleven of the twelve potato linkage groups, have been detected in previous [16] and parallel studies [21]. The absence of Solanum demissum-derived R genes for hypersensitive response to late blight and the co-localisation of QTL for resistance, vigour and earliness suggest that developmental and/or physiological factors play a major role in determining the level of foliage resistance in this population. In contrast with previous findings, a negative correlation was found between foliage and tuber blight resistance.

Original languageEnglish
Pages (from-to)387-398
Number of pages12
JournalMolecular Breeding
Volume5
Issue number5
DOIs
Publication statusPublished - 1 Jan 1999

Keywords

  • Earliness
  • Late blight
  • Linkage mapping
  • Potato
  • QTL
  • Vigour

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    Collins, A., Milbourne, D., Ramsay, L., Meyer, R., Chatot-Balandras, C., Oberhagemann, P., De Jong, W., Gebhardt, C., Bonnel, E., & Waugh, R. (1999). QTL for field resistance to late blight in potato are strongly correlated with maturity and vigour. Molecular Breeding, 5(5), 387-398. https://doi.org/10.1023/A:1009601427062