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Pakistan Journal of Biological Sciences

Year: 2006 | Volume: 9 | Issue: 7 | Page No.: 1205-1211
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Authors

E. Sari

H.R. Etebarian

A. Roustaei

H. Aminian

Keywords

Research Article

Biological Control of Gaeumannomyces graminis var. tritici on Wheat with Some Isolates of Pseudomonas fluorescens

E. Sari, H.R. Etebarian, A. Roustaei and H. Aminian
Pseudomonas fluorescens CHAO, P. fluorescens bioIII (21P), P. fluorescens bioIII (22P), P. fluorescens bioV(5 kM) and P. fluorescens bio V (32J) were evaluated as potential biological agent for wheat take-all caused by Gaeumannomyces graminis var. tritici in vitro and vivo. Dual culture, volatile metabolite and cell free culture test showed that all isolates of Pseudomonas tested inhibited growth of the pathogen. Inhibition varied from 32 to 73% in dual culture, from 52 to 96% in volatile metabolite and from 77 to 98% in cell free culture test. The seed soaking treatment with P. fluorescens CHAO and P. fluorescens bioIII (21P) were the most effective in reducing disease index and also promoted root and shoot weight in glasshouse and field experiment. The weight of 100 grain from plants treated with pathogen + P. fluorescens bioIII (21P) or P. fluorescens CHAO were significantly greater than in controls inoculated with pathogen alone in micorplot test. These results indicate that P. fluorescens bioIII (21P) could be an important new biological control for take-all of wheat.
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