Campus Units

North Central Regional Plant Introduction Station, Agronomy, Horticulture

Document Type

Conference Proceeding

Conference

2nd International Downy Mildews Symposium

Publication Version

Published Version

Publication Date

2007

Journal or Book Title

Advances in Downy Mildew Research: Proceedings of the 2nd International Downy Mildews Symposium

Volume

3

First Page

157

Last Page

167

Conference Title

2nd International Downy Mildews Symposium

Conference Date

July 2-6, 2007

City

Olomouc, Czech Republic

Abstract

The Cucumis melo-Pseudoperonospora cubensis host-pathogen interaction is characterized by large variation in specificity. This report summarizes results obtained by laboratory screening of 52 C. melo accessions by 8 isolates of P cubensis. The isolates represent 8 different pathotypes with low, medium or high levels of pathogenicity. The reaction of C. melo accessions was evaluated on leaf discs removed from adult plants; sporulation intensity of P cubensis isolates was measured 6 to 14 days after inoculation. Relatively little variability in reaction patterns to P cubensis isolates was detected. The majority of C. melo accessions was highly susceptible to most of the P cubensis isolates studied. Altogether, 39 C. me lo accessions showed susceptibility to all 8 isolates. Relatively few accessions expressed incomplete resistance (8 accessions in 15 interactions with P cubensis isolates) or heterogenous reactions (8 accessions in 13 interactions). Only one accession (PI 315410) was found to be highly resistant to some P cubensis isolates. Among studied C. melo accessions, 14 different reaction patterns can be distinguished based on qualitative differences in response to this set of P cubensis isolates.

Comments

This is a proceeding from 2nd International Downy Mildews Symposium 3 (2007): 157.

Rights

Works produced by employees of the U.S. Government as part of their official duties are not copyrighted within the U.S. The content of this document is not copyrighted.

Language

en

File Format

application/pdf

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