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Abstract
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Article Information:
Pea Footrot Disease Depends on the Combination of Pathogenicity Genes in Nectria haematococca
Ebimieowei Etebu and A. Mark Osborn
Corresponding Author: Ebimieowei Etebu
Submitted: 2011 January, 05
Accepted: 2011 January, 31
Published: 2011 May, 25 |
Abstract:
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Footrot disease due to Nectria haematococca is an economically important disease of peas all over
the world where peas are grown. The combined effect of pathogenicity genes on disease severity has not been
adequately addressed. Hence in this research, molecular PCR-based assays have been developed and/or used
to detect all six (PDA, PEP1, PEP2, PEP3, PEP4 and PEP5) pea pathogenicity genes in fifteen fungal isolates
previously isolated from fields with footrot disease. The pathogenicity of these isolates on pea was also
assessed. Results showed that all six pathogenicity genes (PDA, PEP1, PEP2, PEP3, PEP4 and PEP5) are
required for high virulence (DI ≥ 3.75). Isolates that possessed only the PEP1 or a combination of the PEP1
and PEP4 genes generally caused a relatively low degree of disease (DI≤2.75). Similarly, reference isolate
156-30-6 which possesses only the PDA gene was non pathogenic on peas (DI = 1.50±0.87). However, without
exception, isolates that possessed the PDA gene alongside other gene(s), especially PEP2, PEP3 and PEP5
genes caused high degrees of disease (DI≥3.50). The PEP2, PEP3 and PEP5 genes were observed only in
isolates with high pathogenicity (DI≥3.75).
Key words: Footrot disease, Fusarium solani, Nectria haematococca, pathogenicity genes, pea, Pisum sativum,
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Cite this Reference:
Ebimieowei Etebu and A. Mark Osborn, . Pea Footrot Disease Depends on the Combination of Pathogenicity Genes in Nectria haematococca. Asian Journal of Agricultural Sciences, (3): 156-161.
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ISSN (Online): 2041-3890
ISSN (Print): 2041-3882 |
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