Abstract:
:The plant-pathogenic fungus Fusarium oxysporum was successfully transformed with the beta-D-glucuronidase gene from Escherichia coli (gusA) (GUS system) in combination with the gene for nitrate reductase (niaD) as the selectable marker. The frequency of cotransformation, as determined by GUS expression on plates containing medium supplemented with 5-bromo-4-chloro-3-indolyl glucuronide (GUS+), was very high (up to 75%). Southern hybridization analyses of GUS+ transformants revealed that single or multiple copies of the gusA gene were integrated into the genomes. High levels of GUS activity are expressed in some transformants, but activity in F. oxysporum does not appear to be correlated with the copy number of the gusA gene. Since the highest activity was found in a transformant with a single copy, it can be assumed that sequence elements of F. oxysporum integrated upstream of the gene can act as a promoter or enhancer. Expression of the gusA gene was also detected during growth of the fungus in plants, indicating that the GUS system can be used as a sensitive and easy reporter gene assay in F. oxysporum.
journal_name
Appl Environ Microbioljournal_title
Applied and environmental microbiologyauthors
Couteaudier Y,Daboussi MJ,Eparvier A,Langin T,Orcival Jdoi
10.1128/AEM.59.6.1767-1773.1993subject
Has Abstractpub_date
1993-06-01 00:00:00pages
1767-73issue
6eissn
0099-2240issn
1098-5336journal_volume
59pub_type
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