Mapping polygenes for tuber resistance to late blight in a diploid Solanum phureja x S. stenotomum hybrid population

I. Simko, S. Costanzo, V. Ramanjulu, B. J. Christ, K. G. Haynes

Research output: Contribution to journalArticle

25 Citations (Scopus)

Abstract

Potato tuber blight is a disease caused by the oomycete Phytophthora infestans (Mont.) de Bary. Due to the significant economic impact of this disease, introgression of durable resistance into the cultivated potato is one of the top priorities of breeding programmes worldwide. Though numerous resistance loci against this devastating disease have already been mapped, most of the detected loci are contributing towards foliar resistance while specific information on tuber resistance is limited. To identify the genetic components of tuber resistance and its relationship to foliar resistance and plant maturity we have investigated the host-pathogen interaction in a segregating diploid hybrid Solanum phureja x S. stenotomum family. Mature tubers from this mapping family were inoculated with a sporangial suspension of P. infestans (US-8 clonal lineage) and evaluated for lesion expansion. No significant correlation was detected between late blight resistance in foliage and tubers, and between plant maturity and tuber resistance. Four chromosomal regions were significantly associated with tuber resistance to the disease. The largest effect was detected near the marker locus PSC (LOD 10.7) located on chromosome 10. This locus explained about 63% of the total phenotypic variation of the trait. The other three resistance-related loci were mapped on chromosomes 8 (GP1282, LOD 4.4), 6 (CP18, LOD 4.0) and 2 (CP157, LOD 3.8). None of the four tuber resistance loci coincides with the foliage resistance loci detected in this same family. Tuber blight resistance quantitative trait loci (QTL) on chromosomes 2, 8 and 10 are distinct from the maturity QTLs and have an additive effect on tuber resistance. These results indicate that different genes are involved in foliar and tuber resistance to P. infestans in the present family and that some of the resistance genes might be associated with late maturity.

Original languageEnglish (US)
Pages (from-to)385-389
Number of pages5
JournalPlant Breeding
Volume125
Issue number4
DOIs
StatePublished - Aug 1 2006

Fingerprint

Solanum tuberosum subsp. andigenum
Phytophthora infestans
Solanum
Diploidy
Chromosomes, Human, Pair 8
Chromosomes, Human, Pair 10
tubers
diploidy
Solanum tuberosum
Plant Tubers
Oomycetes
Population
Host-Pathogen Interactions
Disease Resistance
Chromosomes, Human, Pair 2
loci
Quantitative Trait Loci
Genes
Breeding
Suspensions

All Science Journal Classification (ASJC) codes

  • Agronomy and Crop Science
  • Genetics
  • Plant Science

Cite this

Simko, I. ; Costanzo, S. ; Ramanjulu, V. ; Christ, B. J. ; Haynes, K. G. / Mapping polygenes for tuber resistance to late blight in a diploid Solanum phureja x S. stenotomum hybrid population. In: Plant Breeding. 2006 ; Vol. 125, No. 4. pp. 385-389.
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abstract = "Potato tuber blight is a disease caused by the oomycete Phytophthora infestans (Mont.) de Bary. Due to the significant economic impact of this disease, introgression of durable resistance into the cultivated potato is one of the top priorities of breeding programmes worldwide. Though numerous resistance loci against this devastating disease have already been mapped, most of the detected loci are contributing towards foliar resistance while specific information on tuber resistance is limited. To identify the genetic components of tuber resistance and its relationship to foliar resistance and plant maturity we have investigated the host-pathogen interaction in a segregating diploid hybrid Solanum phureja x S. stenotomum family. Mature tubers from this mapping family were inoculated with a sporangial suspension of P. infestans (US-8 clonal lineage) and evaluated for lesion expansion. No significant correlation was detected between late blight resistance in foliage and tubers, and between plant maturity and tuber resistance. Four chromosomal regions were significantly associated with tuber resistance to the disease. The largest effect was detected near the marker locus PSC (LOD 10.7) located on chromosome 10. This locus explained about 63{\%} of the total phenotypic variation of the trait. The other three resistance-related loci were mapped on chromosomes 8 (GP1282, LOD 4.4), 6 (CP18, LOD 4.0) and 2 (CP157, LOD 3.8). None of the four tuber resistance loci coincides with the foliage resistance loci detected in this same family. Tuber blight resistance quantitative trait loci (QTL) on chromosomes 2, 8 and 10 are distinct from the maturity QTLs and have an additive effect on tuber resistance. These results indicate that different genes are involved in foliar and tuber resistance to P. infestans in the present family and that some of the resistance genes might be associated with late maturity.",
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Mapping polygenes for tuber resistance to late blight in a diploid Solanum phureja x S. stenotomum hybrid population. / Simko, I.; Costanzo, S.; Ramanjulu, V.; Christ, B. J.; Haynes, K. G.

In: Plant Breeding, Vol. 125, No. 4, 01.08.2006, p. 385-389.

Research output: Contribution to journalArticle

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T1 - Mapping polygenes for tuber resistance to late blight in a diploid Solanum phureja x S. stenotomum hybrid population

AU - Simko, I.

AU - Costanzo, S.

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