ArticleTAG. Theoretical and applied genetics. Theoretische und angewandte Genetik2025
QTL combinations associated with field partial resistance to Aphanomyces root rot in pea near-isogenic lines.
Article in TAG. Theoretical and applied genetics. Theoretische und angewandte Genetik, 2025. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
Aphanomyces root rot, caused by Aphanomyces euteiches, is one of the most-important diseases of pea (Pisum sativum L.) worldwide. The development of resistant varieties is a major objective to manage the disease. Consistent quantitative trait loci (QTL) controlling partial resistance were discovered from linkage mapping and genome-wide association studies. This study aimed to validate the resistance QTL effects and identify effective QTL combinations under contaminated field conditions, by exploiting near-isogenic lines (NILs) carrying resistance alleles at individual or combined consistent QTL in different genetic backgrounds. A total of 157 NILs previously created were fingerprinted using 10,494 SNP markers from the GenoPea Infinium® BeadChip, which made it possible to confirm the QTL introgression sizes in the NILs. All NILs were phenotyped for resistance in field-contaminated nurseries over eight environments in 2 years at six locations in France. NILs carrying resistance alleles from PI180693 or 90-2131 at the major-effect QTL Ae-Ps7.6, individually or in combination with minor-effect QTL (Ae-Ps4.1 or Ae-Ps5.1), showed increased levels of partial resistance in at least three environments and three genetic backgrounds. At other QTL combinations (Ae-Ps1.2 or Ae-Ps7.6 + Ae-Ps2.2 ± Ae-Ps3.1), alleles from PI180693 or 552 also showed consistent and novel effects on partial resistance in some NIL genetic backgrounds. At these QTL combinations, the PI180693 resistance alleles also contributed to late flowering. This study provides tools and information for the choice of resistance QTL to combine in breeding, to increase partial resistance to A. euteiches in pea varieties.
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