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Insect feeding on cucumber mediated by rhizobacteria-induced plant resistance |
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| Authors: | Geoffrey Zehnder Joseph Kloepper Sadik Tuzun Changbin Yao Gang Wei Oyette Chambliss Richard Shelby |
| Institution: | (1) Department of Entomology, Auburn University, 206 Extension Hall, Auburn, AL 36849, USA;(2) Department of Plant Pathology, Auburn University, AL 36849, USA;(3) Department of Horticulture, Auburn University, Auburn, AL 36849, USA |
| Abstract: | Select strains of plant growth-promoting rhizobacteria (PGPR) were evaluated in greenhouse experiments with cucumber for induction of resistance against cucumber beetle (Diabrotica undecimpunctata howardi Barber) feeding and the beetle-transmitted cucurbit wilt disease. When beetles were given a choice between PGPR-treated and nontreated cucumber, their feeding on stems and cotyledons and the severity of wilt symptoms were significantly lower on PGPR-treated plants. HPLC analysis demonstrated that cotyledons from PGPR-treated plants contained significantly lower concentrations of the cucumber beetle feeding stimulant cucurbitacin than nontreated plants. These results suggest that a mechanism for PGPR-induced resistance against cucumber beetle feeding may involve a change in the metabolic pathway for cucurbitacin synthesis. |
| Keywords: | cucumber cucumber beetle cucurbitacin induced resistance Erwinia tracheiphila/ plant growth-promoting rhizobacteria |
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