Rhizosphere competence of Fusarium species colonizing corn roots
1994
Ocamb, C.M. | Kommedahl, T.
We examined colonization of corn roots and rhizosphere soil by Fusarium species, corn root and rhizosphere colonization by Fusarium graminearum in competition with F. oxysporum or F. proliferalum in the growth chamber, and variability in corn root and rhizosphere colonization among isolates of F. graminearum and F. oxysporum. When corn kernels were infested with individual Fusarium species then planted in the field, F. moniliforme, F. oxysporum, and F. proliferalum were isolated from root tissue and rhizosphere soil along the entire portion of root sampled. F. solani was isolated from nearly the entire root length and accompanying rhizosphere soil. F. equiseli and F. graminearum, however, were isolated from a very limited portion of the root and rhizosphere soil. Colonization patterns in a growth chamber were similar to the field study. Moreover, F. graminearum colonized a smaller portion of the root and rhizosphere in the presence of F. oxysporum or F. proliferatum than alone. Isolates of F. graminearum and F. oxysporum varied in degrees of root and rhizosphere colonization. We suggest that F moniliforme, F oxysporum, F. proliferatum, and F. solani are rhizosphere competent on corn, whereas F. graminearum and F. equiseli are not rhizosphere competent.
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