Relative Competitiveness and Virulence of Four Clonal Lineages of Cephalosporium maydis from Egypt Toward Greenhouse-Grown Maize

Plant Disease
Kurt A ZellerJohn F Leslie

Abstract

Four clonal lineages of Cephalosporium maydis, a soilborne vascular wilt pathogen that causes late wilt of maize, were differentiated previously with molecular markers. In Egypt, this fungus can cause significant losses in infected susceptible plants. In greenhouse tests of individual isolates we found that these lineages differ in their virulence toward a series of maize accessions commonly used in Egyptian maize breeding programs. We also determined the relative competitiveness of representatives of the four lineages when incorporated into the soil as a mixed inoculum. The lineage (IV) with greatest mean disease incidence (virulence), when tested alone, was the least competitive on susceptible maize accessions when coinoculated as a component of mixed inocula of all four lineages. In these coinoculation experiments, one of the less-virulent lineages (II) dominated (70% of infections) and appeared to be the most competitive. These results suggest that virulence and competitive ability are not the same in this host-pathogen system. These results also suggest that standard protocols that rely on mixed inocula for resistance screening need to be altered, and that the relative proportion of the different lineages of the pathogen r...Continue Reading

References

Oct 10, 1980·Nucleic Acids Research·M G Murray, W F Thompson
Nov 11, 1995·Nucleic Acids Research·P VosM Kuiper
Sep 3, 1999·Applied and Environmental Microbiology·Z KerényiJ F Leslie

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Citations

Oct 24, 2008·Phytopathology·Amgad A SalehJohn F Leslie
Feb 5, 2015·Physiology and Molecular Biology of Plants : an International Journal of Functional Plant Biology·Ofir DeganiYuval Goldblat

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