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THE PLANT CELL, Vol 9, Issue 3 317-333, Copyright © 1997 by American Society of Plant Biologists
Differences in Susceptibility of Arabidopsis Ecotypes to Crown Gall Disease May Result from a Deficiency in T-DNA Integration
J. Nam, A. G. Matthysse and S. B. Gelvin
Department of Biological Sciences, Purdue University, West Lafayette, Indiana 47907-1392
We show that among ecotypes of Arabidopsis, there is considerable variation
in their susceptibility to crown gall disease. Differences in
susceptibility are heritable and, in one ecotype, segregate as a single
major contributing locus. In several ecotypes, recalcitrance to
tumorigenesis results from decreased binding of Agrobacterium to inoculated
root explants. The recalcitrance of another ecotype occurs at a late step
in T-DNA transfer. Transient expression of a T-DNA-encoded
[beta]-glucuronidase gusA gene is efficient, but the ecotype is deficient
in crown gall tumorigenesis, transformation to kanamycin resistance, and
stable GUS expression. This ecotype is also more sensitive to [gamma]
radiation than is a susceptible ecotype. DNA gel blot analysis showed that
after infection by Agrobacterium, less T-DNA was integrated into the genome
of the recalcitrant ecotype than was integrated into the genome of a highly
susceptible ecotype.
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