4.5 Article

Identification of Major Quantitative Trait Loci Controlling Field Resistance to Downy Mildew in Cultivated Lettuce (Lactuca sativa)

期刊

PHYTOPATHOLOGY
卷 111, 期 3, 页码 541-547

出版社

AMER PHYTOPATHOLOGICAL SOC
DOI: 10.1094/PHYTO-08-20-0367-R

关键词

Bremia lactucae; disease resistance; downy mildew; field resistance; genetics; Lactuca sativa; lettuce; quantitative trait loci

资金

  1. Becas Chile, National Commission for Science Research and Technology (CONICYT), Chile
  2. United States Department of Agriculture-National Institute of Food and Agriculture Specialty Crops Research Initiative [2010-51181-21631, 2017-67013-26211]
  3. California Leafy Greens Research Board
  4. NIFA [2010-51181-21631, 580354, 2017-67013-26211, 914652] Funding Source: Federal RePORTER

向作者/读者索取更多资源

The study identified a major QTL on chromosome 4 that significantly affects field resistance in both the Grand Rapids x Salinas and Iceberg x PI491224 populations, as well as two additional significant QTLs on chromosomes 2 and 5 in the Iceberg x PI491224 RIL population. By utilizing marker-assisted gene pyramiding of multiple Dm genes along with QTLs for field resistance, there is potential to develop cultivars with more durable resistance to B. lactucae.
Lettuce downy mildew, caused by Bremia lactucae Regel, is the most economically important foliar disease of lettuce (Lactuca sativa L.). The deployment of resistant cultivars carrying dominant resistance genes (Dm genes) plays a crucial role in integrated downy mildew disease management; however, high variability in pathogen populations leads to the defeat of plant resistance conferred by Dm genes. Some lettuce cultivars exhibit field resistance that is only manifested in adult plants. Two populations of recombinant inbred lines (RILs), originating from crosses between the field resistant cultivars Grand Rapids and Iceberg and susceptible cultivars Salinas and PI491224, were evaluated for downy mildew resistance under field conditions. In all, 160 RILs from the Iceberg x PI491224 and 88 RILs from the Grand Rapids x Salinas populations were genotyped using genotyping by sequencing, which generated 906 and 746 high-quality markers, respectively, that were used for quantitative trait locus (QTL) analysis. We found a QTL in chromosome 4 that is present in both Grand Rapids x Salinas and Iceberg x PI491224 populations that has a major effect on field resistance. We also found two additional significant QTLs in chromosomes 2 and 5 in the Iceberg x PI491224 RIL population. Marker-assisted gene pyramiding of multiple Dm genes in combination with QTLs for field resistance provide the opportunity to develop cultivars with more durable resistance to B. lactucae.

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