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Russian Journal of Genetics

, Volume 55, Issue 3, pp 330–336 | Cite as

RT-qPCR Analysis of Host Defense-Related Genes in Nonhost Resistance: Wheat-Bgh Interaction

  • A. RezaeiEmail author
  • S. Mahdian
  • V. Babaeizad
  • S. H. Hashemi-PetroudiEmail author
  • S. M. Alavi
PLANT GENETICS
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Abstract

Non-host resistance (NHR) is a plant defense system against the majority of microbial pathogens. Blumeria graminis f. sp. hordei (Bgh), is an obligate biotrophic ascomycete fungal pathogen that can grow and reproduce only on living cells of wild or domesticated barley (Hordeum sp.).‎ In this study, the expression pattern of eight defense-related genes including NPR1, PR2, PR5, PR1-2, Lipase, LTP, PAL and POX was assessed in bread wheat (Triticum aestivum cv. Darya) against the powdery mildew fungus Bgh. Hydrogen peroxide (H2O2) activity in leaf tissues was also detected histochemically with 3,3-diaminobenzidine (DAB) staining. Result showed that in response to virulence agent, Bgh spores, papillae and hypersensitive response (HR) were formed in the 53.9 and 40.1% of infected area, respectively while in the rest of the infected area (6%) spores were not germinated. According to the histochemical analysis, the wheat NHR against Bgh belongs to type IІ NHR and display a multi-layered feature including wax composition, pre-formed barriers, papilla formation, hypersensitive response. According to results of expression analysis, the Pox, PR5 and PR1-2 expression level were clearly upregulated 24 hours post inoculation (hpi) and LTP was identified as an early signaling response to Bgh. In this study NPR1 was down regulated during all given time points, thus we suggested that salicylic acid (SA) signaling pathway may be mediated by a NPR1-independent mechanism(s) in wheat-Bgh interaction. The coordinated induction of a set of so-called systemic acquired resistance (SAR) genes including POX, PR1-2 and PR5 was observed in wheat-Bgh interaction. Expression pattern of defense-related genes at the wheat-Bgh interaction can be taken as an indication of their functional relevance at different time points of tissue infection.

Keywords:

wheat-Bgh interaction nonhost resistance barley powdery mildew qPCR papilla formation NPR1 

Notes

ACKNOWLEDGMENTS

This research was supported by the Genetic and Agricultural Biotechnology Institute of Tabarestan (GABIT), Sari Agricultural Sciences and Natural Resources University (SANRU).

COMPLIANCE WITH ETHICAL STANDARDS

The authors declare that they have no conflict of interest. This article does not contain any studies involving animals or human participants performed by any of the authors.

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Copyright information

© Pleiades Publishing, Inc. 2019

Authors and Affiliations

  1. 1.Department of Plant Protection, Sari Agricultural Sciences and Natural Resources UniversitySariIran
  2. 2.Genetics and Agricultural Biotechnology Institute of Tabarestan, Sari Agricultural Sciences and Natural Resources UniversitySariIran

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