Induction of resistance in tomato against cucumber mosaic cucumovirus by plant growth-promoting rhizobacteria |
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Authors: | Geoffrey W Zehnder Changbin Yao John F Murphy Edward R Sikora Joseph W Kloepper |
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Institution: | (1) Department of Entomology, Auburn University, 206 Extension Hall, Alabama 36849, USA;(2) Department of Entomology, Auburn University, 206 Extension Hall, Alabama 36849, USA;(3) Department of Plant Pathology, Auburn University, Alabama 36849, USA |
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Abstract: | Studies were done to evaluate specific strains of plant growth promoting rhizobacteria (PGPR) for induced resistance against
cucumber mosaic cucumovirus(CMV) in tomato. In greenhouse experiments where plants were challenged by mechanical inoculation
of CMV, the percentage of symptomatic plants in the most effective PGPR treatments ranged from 32 to 58%,compared with 88
to 98% in the nonbacterized, challenged disease control treatment. Field experiments were conducted in 1996 and 1997 to evaluate
4 PGPR strain treatments based on superior performance in the greenhouse studies. In the 1996field experiment, tomato plants
treated with 3 PGPR strains exhibited a significantly lower incidence of CMV infection and significantly higher yields, compared
with nonbacterized, CMV-challenged controls. In 1997, the overall percentages of plants infected with CMV in the control and
PGPR treatments was higher than in 1996. CMV symptom development was significantly reduced on PGPR-treated plants in 1997compared
with the control, but the percentage of infected plants and tomato yields were not significantly different among treatments.
These results suggest that PGPR-mediated induced resistance against CMV infection following mechanical inoculation onto tomato
can be maintained under field conditions.
This revised version was published online in July 2006 with corrections to the Cover Date. |
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Keywords: | Bacillus amyloliquefaciens Bacillus pumilus Bacillus subtilus induced resistance induced systemic resistance Kluyvera cryocrescens plant defense |
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