European Journal of Plant Pathology

, Volume 115, Issue 3, pp 309–321

Macroscopic and Histological Characterisation of Genes er1 and er2 for Powdery Mildew Resistance in Pea

  • S. Fondevilla
  • T. L. W. Carver
  • M. T. Moreno
  • D. Rubiales
Original Paper

DOI: 10.1007/s10658-006-9015-6

Cite this article as:
Fondevilla, S., Carver, T.L.W., Moreno, M.T. et al. Eur J Plant Pathol (2006) 115: 309. doi:10.1007/s10658-006-9015-6

Abstract

In pea, two single recessive genes, er1 and er2, have been identified for resistance to powdery mildew caused by Erysiphe pisi, but little is known about their mode of action. Pea accessions carrying the genes er1 or er2 and other accessions displaying resistance to powdery mildew in the field were studied. In accessions carrying gene er1, epidermal cell penetration was prevented and very few haustoria or colonies were formed. Under controlled conditions, er1 conferred complete or almost complete resistance to the fungal isolates used and this resistance was not associated with macroscopically visible necrosis. Under field conditions these accessions developed a low level of disease. Resistance in line JI2480 (carrying er2) increased with temperature and leaf age, and complete resistance was expressed only at high temperature (25 °C) or in mature leaves. This resistance was based mainly on post-penetration cell death, complemented by a reduction of percentage penetration success in mature leaves. Combining the resistance provided by gene er1 and by line JI2480 into new cultivars is likely to increase their level of resistance and enhance durability of the protection.

Keywords

grain legumes haustorium histology hypersensitive resistance 

Copyright information

© Springer 2006

Authors and Affiliations

  • S. Fondevilla
    • 1
    • 3
  • T. L. W. Carver
    • 2
  • M. T. Moreno
    • 1
  • D. Rubiales
    • 3
  1. 1.IFAPACICECIFA-Alameda del ObispoCórdobaSpain
  2. 2.Institute of Grassland and Environmental ResearchAberystwythUK
  3. 3.CSICInstituto de Agricultura SostenibleCórdobaSpain

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