| Autor: |
Levy, E., Eyal, Z., Carmely, S., Kashman, Y., Chet, I. |
| Předmět: |
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| Zdroj: |
Plant Pathology; Dec89, Vol. 38 Issue 4, p564-570, 7p |
| Abstrakt: |
A fluorescent Pseudomonas sp. (strain LEC 1) isolated from soil suppressed Septoria tritici by 88% and Puccinia recondita by 98% when applied to wheat seedlings 3 h prior to inoculation with the pathogens. Fractionation and analysis of two inhibitory compounds from cultures of strain LEC 1 on thin-layer chromatography plates yielded the phenazine antibiotics 1-hydroxyphenazine (phOH) and chlororaphin. 1-hydroxyphenazine reduced the growth of Pythium aphanidermatum, Fusarium oxysporum f.sp. vasinfectum. Sclerotinia sclerotiorum and S. rolfsii on a defined medium, with greatest activity against P. aphanidermatum and least against S. rolfsii. Application of 160 mg/l phOH to wheat seedlings reduced S. tritici by 61 % and P. recondita by 75%. Lower concentrations of the antibiotic were less effective. Growth of S. tritici in liquid medium was reduced by phOH at 5ndash;20 mg/l and prevented at 40 mg/l. When phOH was added to the medium 48 h after inoculation (logarithmic growth phase), growth was interrupted but later recovered with phOH concentrations up to 40 mg/l; there was no recovery at 60 mg/l. Chlororaphin inhibited the growth of S. tritici on malt agar medium. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
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