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Titolo:
SUPPRESSION OF FUSARIUM-WILT OF WATERMELON BY NONPATHOGENIC FUSARIUM-OXYSPORUM AND OTHER MICROORGANISMS RECOVERED FROM A DISEASE-SUPPRESSIVE SOIL
Autore:
LARKIN RP; HOPKINS DL; MARTIN FN;
Indirizzi:
ARS,USDA,BIOCONTROL PLANT DIS LAB BELTSVILLE MD 20705 ARS,USDA SALINAS CA 93905 UNIV FLORIDA,CENT FLORIDA RES & EDUC CTR LEESBURG FL 34748
Titolo Testata:
Phytopathology
fascicolo: 8, volume: 86, anno: 1996,
pagine: 812 - 819
SICI:
0031-949X(1996)86:8<812:SOFOWB>2.0.ZU;2-H
Fonte:
ISI
Lingua:
ENG
Soggetto:
VEGETATIVE COMPATIBILITY GROUPS; F-SP NIVEUM; BIOLOGICAL-CONTROL; PSEUDOMONAS-PUTIDA; CHLAMYDOSPORE GERMINATION; STRAINS; FLUORESCENT; RESISTANCE; CUCUMBER; MECHANISMS;
Keywords:
FUSARIUM OXYSPORUM F SP NIVEUM; CITRULLUS LANATUS; RHIZOPLANE; RHIZOSPHERE; SOIL MICROBIOLOGY;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
43
Recensione:
Indirizzi per estratti:
Citazione:
R.P. Larkin et al., "SUPPRESSION OF FUSARIUM-WILT OF WATERMELON BY NONPATHOGENIC FUSARIUM-OXYSPORUM AND OTHER MICROORGANISMS RECOVERED FROM A DISEASE-SUPPRESSIVE SOIL", Phytopathology, 86(8), 1996, pp. 812-819

Abstract

Nearly 400 microorganism isolates, including bacteria, actinomycetes,and fungi, were collected from watermelon roots growing in soils suppressive and nonsuppressive to Fusarium wilt of watermelon. These isolates were screened for their ability to restore suppressiveness to microwave-treated suppressive soil and to reduce disease incidence in conducive field soil. Specific isolates of nonpathogenic Fusarium oxysporum from suppressive soil were the only organisms consistently effectivein reducing disease (35 to 75% reduction) in both microwave-treated and natural field soils. Thus, we concluded that F. oxysporum was the primary antagonist responsible for suppression in this suppressive soil, although other organisms may contribute to suppressiveness. Selectedisolates of F. oxysporum were effective in reducing disease when added to field soils at inoculum levels as low as 50 to 100 chlamydosporesper g of soil, which was comparable to or below pathogen inoculum levels (100 to 200 CFU/g of soil). Root colonization data indicated that reduction of disease was not directly related to the ability of the antagonist to colonize roots extensively or to reduce colonization by the pathogen. Effective antagonists were not associated with specific vegetative compatibility groups, indicating antagonists represent diverse isolates. In split-root experiments, in which the antagonist and thepathogen were physically separated from each other, root colonizationby selected isolates of F. oxysporum reduced disease incidence, verifying the mechanism of action as induced systemic resistance. Several isolates of F. oxysporum from this suppressive soil have potential for development as biocontrol agents.

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Documento generato il 27/09/20 alle ore 22:02:10