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Plant function and evolutionary biology
RESEARCH ARTICLE (Open Access)

A survey of genes involved in Arachis stenosperma resistance to Meloidogyne arenaria race 1

Carolina V. Morgante A E , Ana C.M. Brasileiro B , Philip A. Roberts C , Larissa A. Guimaraes B , Ana C.G. Araujo B , Leonardo N. Fonseca B , Soraya C.M. Leal-Bertioli B , David J. Bertioli D and Patricia M. Guimaraes B
+ Author Affiliations
- Author Affiliations

A Embrapa Semiárido, BR 428, Km 152, CP 23, 56302-970, Petrolina, PE, Brazil.

B Embrapa Recursos Genéticos e Biotecnologia, PqEB – Av W5 Norte, CP 02372, 70770-917, Brasília, DF, Brazil.

C University of California, Nematology Department, 2251 Spieth Hall Riverside, CA 92521, USA.

D Universidade de Brasília, Departamento de Genética e Morfologia, Campus Universitario Darcy Ribeiro, 70910-900, Brasília, DF, Brazil.

E Corresponding author. Email: carolina.morgante@embrapa.br

This paper originates from a presentation at the ‘VI International Conference on Legume Genetics and Genomics (ICLGG)’ Hyderabad, India, 2–7 October 2012.

Functional Plant Biology 40(12) 1298-1309 https://doi.org/10.1071/FP13096
Submitted: 22 April 2013  Accepted: 11 July 2013   Published: 19 August 2013

Journal Compilation © CSIRO Publishing 2013 Open Access CC BY-NC-ND

Abstract

Root-knot nematodes constitute a constraint for important crops, including peanut (Arachis hypogaea L.). Resistance to Meloidogyne arenaria has been identified in the peanut wild relative Arachis stenosperma Krapov. & W. C. Greg., in which the induction of feeding sites by the nematode was inhibited by an early hypersensitive response (HR). Here, the transcription expression profiles of 19 genes selected from Arachis species were analysed using quantitative reverse transcription–polymerase chain reaction (qRT-PCR), during the early phases of an A. stenosperma–M. arenaria interaction. Sixteen genes were significantly differentially expressed in infected and non-infected roots, in at least one of the time points analysed: 3, 6, and 9 days after inoculation. These genes are involved in the HR and production of secondary metabolites related to pathogen defence. Seven genes encoding a resistance protein MG13, a helix-loop helix protein, an ubiquitin protein ligase, a patatin-like protein, a catalase, a DUF538 protein, and a resveratrol synthase, were differentially expressed in all time points analysed. Transcripts of two genes had their spatial and temporal distributions analysed by in situ hybridisation that validated qRT-PCR data. The identification of candidate resistance genes involved in wild peanut resistance to Meloidogyne can provide additional resources for peanut breeding and transgenic approaches.

Additional keywords: hypersensitive response, in situ hybridisation, peanut, qRT-PCR, root-knot nematode, wild Arachis.


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