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Seedling mortality of metal hyperaccumulator plants resulting from damping off by Pythium spp.

Published online by Cambridge University Press:  01 May 2000

Y. S. MAJID GHADERIAN ,
ANTHONY J. E. LYON  and
ALAN J. M. BAKER
Y. S. MAJID GHADERIAN
Affiliation:
Department of Biology, University of Isfahan, Isfahan 81745, I. R. Iran Department of Animal and Plant Sciences, University of Sheffield, Sheffield S10 2TN, UK
ANTHONY J. E. LYON
Affiliation:
Department of Animal and Plant Sciences, University of Sheffield, Sheffield S10 2TN, UK
ALAN J. M. BAKER
Affiliation:
Department of Animal and Plant Sciences, University of Sheffield, Sheffield S10 2TN, UK
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Abstract

Seedling mortality of Alyssum serpyllifolium ssp. lusitanicum and A. murale, both nickel hyperaccumulators, was reduced by increasing concentrations of metal within plant tissues when inoculated with the fungi Pythium mamillatum or P. ultimum, both of which cause damping-off disease of seedlings. Pythium mamillatum, isolated from nickel-rich serpentine soil, was more tolerant of nickel than P. ultimum, isolated from low-metal control soil, and was more pathogenic than P. ultimum towards seedlings containing high concentrations of metal. These results support the hypothesis that metal hyperaccumulation by plants is closely linked to increased protection against disease.

Keywords

Alyssumdamping offmetal hyperaccumulationnickelPythium
Type
Research Article
Information
The New Phytologist , Volume 146 , Issue 2 , May 2000 , pp. 219 - 224
Copyright
© Trustees of the New Phytologist 2000

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