ISSN:
1432-0983
Keywords:
Transgene inactivation
;
Silencing
;
Oomycete
;
Phythophthora infestans
Source:
Springer Online Journal Archives 1860-2000
Topics:
Biology
Notes:
Abstract The mitotic and meiotic stabilities of transgenes were evaluated in the oomycete, Phytophthora infestans. Genes encoding β-glucuronidase (GUS), neomycin phosphotransferase (NPT) and hygromycin phosphotransferase (HPT), fused to one of six promoters from P. infestans or other oomycetes, were usually stably expressed during continued asexual culture and transmitted to progeny. However, the activity of these genes became undetectable in many strains during asexual or sexual propagation. Over 33 months of growth, transgene expression stopped each month in 1–3% of the transformants. Silencing of the genes was not associated with their deletion, mutation, or hypermethylation. The conformation of the integrated sequences was similar in strains destined to continue or terminate expression of the transgenes. Expression of the genes was not associated with a loss of fitness during growth in vitro and in planta, which might otherwise have selected for silencing events.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF00518171
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