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Title of Journal: Euphytica

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Abbravation: Euphytica

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Springer Netherlands

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1573-5060

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Differential gene transcript accumulation in peas

Authors: E Barilli D Rubiales T Gjetting M F Lyngkjaer
Publish Date: 2014/01/19
Volume: 198, Issue: 1, Pages: 13-28
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Abstract

Pea powdery mildew incited by Erysiphe pisi represents a major constraint for pea crop worldwide Only three resistance genes er1 er2 and Er3 have been identified in pea germplasm so far Cellular and molecular aspects involved in their interaction with the pathogen are still unknown In the present study we selected three wellcharacterised powdery mildew pea accessions carrying each of these resistance genes JI2302 er1 JI2480 er2 and IFPI3260 Er3 for a combined cDNA array and histological analyses Transcripts of twenty pea genes including three housekeeping genes were generated at 24 48 and 72 h after fungal inoculation The 17 genes analysed encoded for phenylpropanoids structurally related genes disease relative response genes or homologues genes to characterised pathogenesisrelated family PR genes from barley known to be upregulated after powdery mildew infection A total of 16 genes out of the 20 studied were differentially expressed between genotypes and/or E pisi infection as well as between the time points considered The transcript inductions observed are expressed as reinforcement of cell walls activation of pathogenesisrelated proteins and the activation of the phenylpropanoid pathway Leaves of genotype JI2302 er1 showed mainly Pschitin and Chi2 encoding for endochitinases accumulation after E pisi inoculation as well as genes encoding for pea defensins Leaves of IFPI3260 Er3 showed the overall highest expression of DRR230a DRR230b and DRR230c encoding pea defensins and Prx7 encoding an elicitorinducible peroxidase after pathogen inoculation Genotype JI2480 er2 showed Pschitin and Chi2 accumulation after E pisi inoculation as well as reduced activation of pea defensins compared to er1 and Er3 genotypes after pathogen attack Upregulation of genes involved in these mechanisms combined with high constitutive expression determines a more effective defence against E pisi

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