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Titolo:
ECOLOGY OF FUSARIUM-OXYSPORUM F-SP NIVEUM IN SOILS SUPPRESSIVE AND CONDUCIVE TO FUSARIUM-WILT OF WATERMELON
Autore:
LARKIN RP; HOPKINS DL; MARTIN FN;
Indirizzi:
N CAROLINA STATE UNIV,DEPT PLANT PATHOL RALEIGH NC 27695 UNIV FLORIDA,DEPT PLANT PATHOL GAINESVILLE FL 32611 CENT FLORIDA RES & EDUC CTR LEESBURG FL 32749
Titolo Testata:
Phytopathology
fascicolo: 10, volume: 83, anno: 1993,
pagine: 1105 - 1116
SICI:
0031-949X(1993)83:10<1105:EOFFNI>2.0.ZU;2-U
Fonte:
ISI
Lingua:
ENG
Soggetto:
GRAMINIS VAR TRITICI; BIOLOGICAL-CONTROL; CHLAMYDOSPORE GERMINATION; PSEUDOMONAS-PUTIDA; SP MELONIS; SP DIANTHI; SP APII; BACTERIA; COLONIZATION; CARNATION;
Keywords:
BIOLOGICAL CONTROL; CITRULLUS LANATUS; SOIL MICROBIOLOGY;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
55
Recensione:
Indirizzi per estratti:
Citazione:
R.P. Larkin et al., "ECOLOGY OF FUSARIUM-OXYSPORUM F-SP NIVEUM IN SOILS SUPPRESSIVE AND CONDUCIVE TO FUSARIUM-WILT OF WATERMELON", Phytopathology, 83(10), 1993, pp. 1105-1116

Abstract

Population dynamics and chlamydospore germination of Fusarium oxysporum f. sp. niveum, as well as colonization of watermelon roots by F. oxysporum, were monitored in relation to other microorganism populationsand the incidence of Fusarium wilt in four soils representing different suppressive and conducive conditions. The soils consisted of an induced suppressive soil developed through monoculture to watermelon c cultivar Crimson Sweet, a nonsuppressive monoculture soil, a conducive fallow soil, and the suppressive soil rendered conducive by microwave treatment. An orange-colored mutant isolate of the pathogen, comparableto the wild-type in growth, pathogenicity, and root colonization, wasused to differentiate the pathogen from indigenous populations of F. oxysporum in the field soils. Pathogen populations remained stable in the monoculture soils over a 6-mo period, but increased somewhat initially and remained at higher levels when added to conducive soils. Suppressiveness was not associated with inhibition of pathogen chlamydospore germination. There were no differences among the field soils in pathogen chlamydospore germination with glucose amendments of 0-1.0 mg/g of soil. Populations of general bacteria, actinomycetes, and fluorescent pseudomonads, both in soil and on watermelon roots, tended to be greater in suppressive than in conducive field soils, whereas fungal populations were greatest in conductive field soil. Root colonization by introduced F. a. niveum, indigenous F. oxysporum, or other microorganism groups was not consistently related to suppressiveness, suggesting that specific antagonistic strains rather than general populations of microorganisms may be involved in suppression.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 22/09/20 alle ore 16:14:34