1. Influence of mineral amendment on disease suppressive activity of Pseudomonas fluorescens to Fusarium wilt of chickpea.
- Author
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Saikia R, Varghese S, Singh BP, and Arora DK
- Subjects
- Cicer growth & development, Copper pharmacology, Fusaric Acid antagonists & inhibitors, Fusaric Acid metabolism, Fusaric Acid pharmacology, Fusarium growth & development, Fusarium pathogenicity, Phenols metabolism, Phloroglucinol analogs & derivatives, Phloroglucinol antagonists & inhibitors, Phloroglucinol metabolism, Pyrroles metabolism, Salicylic Acid metabolism, Thiazoles metabolism, Zinc pharmacology, Antibiosis drug effects, Cicer microbiology, Fusarium metabolism, Minerals pharmacology, Plant Diseases microbiology, Pseudomonas fluorescens metabolism
- Abstract
Fusarium wilt caused by Fusarium oxysporum f. sp. ciceri causes considerable yield loss of chickpea. Pseudomonas fluorescens4-92 (Pf4-92) strain can suppress the disease. Amendment of zinc EDTA and copper EDTA could not suppress the disease significantly when used alone; however, they significantly suppressed the disease in presence of Pf4-92. In vitro observation showed that at 40, 30 and 20microgml(-1) concentrations of these minerals, i.e. Zn, Cu and Zn plus Cu, respectively, completely repressed the production of the phytotoxin, fusaric acid (FA). FA concentration (0.5microgml(-1)) has been shown to suppress the production of 2,4-diacetylphloroglucinol (DAPG) by Pf4-92, and DAPG, salicylic acid, pyochelin and pyoluteorin production was enhanced by these mineral amendments. In rockwool bioassays, Zn, Cu and Zn plus Cu amendments reduced FA production and enhanced DAPG production. This study demonstrates that Zn and Cu enhance biocontrol activity by reducing FA produced by the pathogen, F. oxysporum f. sp. ciceri.
- Published
- 2009
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