Abstract:
:The bacterium Enterobacter cloacae is presently used for biocontrol of postharvest diseases of fruits and vegetables and as a preplant seed treatment for suppression of damping-off. This bacterium has apparent affinities for several grass species, but it is not considered to be an endophyte. While screening corn for fungi and bacteria with potential for biocontrol of various corn diseases, the surface-sterilized kernels of one unknown Italian corn cultivar produced fungus-free corn seedlings with roots endophytically infected by E. cloacae. This paper describes the microscopic nature of E. cloacae RRC 101 with corn, and the in vitro control of Fusarium moniliforme and other fungi with this bacterium. Light and electron microscopy determined that this isolate of E. cloacae was biologically associated with corn seedling roots, where it was distributed intercellularly within the cortex and stele. This is a first report of a strain of this bacterium as an endophytic symbiont of roots. Following a topical application of E. cloacae to kernels, and upon germination this bacterium readily infected roots of two other corn cultivars. The bacterium was observed within the endosperm of germinating corn seedling, but germination was not affected. Further, the bacterium was isolated from leaves and stems of 3- to 6-week-old seedlings indicating that the above ground portions of corn were also colonized. There was no evidence of damage to cells of the root during a three to four week observation period. This bacterium was antagonistic to several isolates of the corn pathogen Fusarium moniliforme, and to two other species of fungi, all of which produce mycotoxins on corn.
journal_name
Mycopathologiajournal_title
Mycopathologiaauthors
Hinton DM,Bacon CWdoi
10.1007/BF01103471subject
Has Abstractpub_date
1995-01-01 00:00:00pages
117-25issue
2eissn
0301-486Xissn
1573-0832journal_volume
129pub_type
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