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Molecular Breeding

, 39:11 | Cite as

Genetic analysis of Phn7.1, a major QTL conferring partial resistance to Phytophthora nicotianae in Nicotiana tabacum

  • Justin M. Ma
  • Crystal Heim
  • Matt Humphry
  • J. M. Nifong
  • Ramsey S. LewisEmail author
Article
  • 31 Downloads

Abstract

The oomycete Phytophthora nicotianae is one of the most economically important pathogens affecting tobacco (Nicotiana tabacum L.). Genetic resistance is a preferred means of managing damage caused by Phytophthora, and genes conferring partial resistance are likely to be more durable over time than those controlling immunity. Characterization of specific genetic variability controlling partial disease resistance may aid the development of long-term strategies for minimizing crop plant disease loss. Previous mapping studies identified a quantitative trait locus (QTL) designated as Phn7.1 controlling partial P. nicotianae resistance. Favorable alleles at this QTL have been identified in cigar tobacco cultivars ‘Beinhart 1000’ and ‘Florida 301,’ and were thought to also be present in most modern elite US flue-cured tobacco germplasm. To gain increased insight of the location and effect of Phn7.1, this QTL was mapped using an increased number of molecular markers (SNPs) in the genomic region of interest. A series of near isogenic lines (NILs) and sub-NILs carrying the Phn7.1-associated genomic region introgressed from Beinhart 1000 in the genetic background of susceptible variety Hicks were developed and evaluated. The region was found to have an additive effect on resistance and the corresponding QTL was localized to within a genetic interval of approximately 3 cM. Genotyping of historical materials with Phn7.1-associated SNP markers strongly suggests that the favorable Phn7.1 allele(s) is present in most modern US flue-cured cultivars and absent in early predecessor germplasm. Information from this study may be useful in marker-assisted selection and for identification of Phn7.1 candidate genes in future investigations.

Keywords

Nicotiana Phytophthora Black shank Plant disease resistance Quantitative trait locus 

Notes

Author contributions

JMM, CM, MH, and JMN performed the research, helped analyze the data, and reviewed the manuscript. RSL designed the research, helped analyzed the data, and drafted the manuscript.

Compliance with ethical standards

Conflict of interest

The authors declare that they have no conflict of interest.

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Copyright information

© Springer Nature B.V. 2019

Authors and Affiliations

  1. 1.Department of Crop and Soil ScienceNorth Carolina State UniversityRaleighUSA
  2. 2.Plant Biotechnology DivisionBritish American Tobacco CompanyCambridgeUK

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