Growth of rhizosphere competent and incompetent Fusarium species from corn on carbon substrates.
1994
Ocamb C.M. | Kommedahl T.
The ability of Fusarium isolates that are rhizosphere incompetent or competent on corn to grow on types of carbon common in the rhizosphere was examined in culture. When growth of Fusarium species was evaluated on glucose, pectin, carboxymethyl cellulose, microcrystalline cellulose, xylans, or xylose, F. graminearum produced a significantly greater hyphal dry weight than did F. equiseti, F. moniliforme, F. oxysporum, F. proliferatum, or F. solani, whereas F. graminearum produced fewer conidia than did the other species. Intraspecific variation in growth occurred among isolates of F. graminearum, F. oxysporum, and F. proliferatum. When F. graminearum was paired with F. moniliforme, F. oxysporum, or F. proliferatum, the numbers of macroconidia and colony-forming units of F. graminearum were lower than those obtained from cultures of F. graminearum grown alone. F. moniliforme, F. oxysporum, and F. proliferatum generally yielded no difference in conidial or colony-forming unit production when in dual culture with F. graminearum as when cultured singly. These data suggest that F. graminearum is less competitive than or is suppressed by F. moniliforme, F. oxysporum, and F. proliferatum and, therefore, could not be rhizosphere competent.
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