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Ashfaq Ali

Bioinformatician

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Paranoid potato : phytophthora-resistant genotype shows constitutively activated defense

Author

  • Ashfaq Ali
  • Laith Ibrahim Moushib
  • Marit Lenman
  • Fredrik Levander
  • Kerstin Olsson
  • Ulrika Carlson-Nilson
  • Nadezhda Zoteyeva
  • Erland Liljeroth
  • Erik Andreasson

Summary, in English

Phytophthora is the most devastating pathogen of dicot plants. There is a need for resistance sources with different modes of action to counteract the fast evolution of this pathogen. In order to better understand mechanisms of defense against P. infestans, we analyzed several clones of potato. Two of the genotypes tested, Sarpo Mira and SW93-1015, exhibited strong resistance against P. infestans in field trials, whole plant assays and detached leaf assays. The resistant genotypes developed different sizes of hypersensitive response (HR)-related lesions. HR lesions in SW93-1015 were restricted to very small areas, whereas those in Sarpo Mira were similar to those in Solanum demissum, the main source of classical resistance genes. SW93-1015 can be characterized as a cpr (constitutive expressor of PR genes) genotype without spontaneous microscopic or macroscopic HR lesions. This is indicated by constitutive hydrogen peroxide (H₂O₂) production and PR1 (pathogenesis-related protein 1) secretion. SW93-1015 is one of the first plants identified as having classical protein-based induced defense expressed constitutively without any obvious metabolic costs or spontaneous cell death lesions.

Department/s

  • Molecular Cell Biology
  • Department of Immunotechnology

Publishing year

2012-03

Language

English

Pages

400-408

Publication/Series

Plant Signaling and Behavior

Volume

7

Issue

3

Document type

Journal article

Publisher

Landes Bioscience

Topic

  • Genetics and Breeding

Keywords

  • Gene Expression Regulation, Plant/genetics
  • Genotype
  • Phytophthora/pathogenicity
  • Plant Diseases/genetics
  • Solanum tuberosum/genetics

Status

Published

ISBN/ISSN/Other

  • ISSN: 1559-2316