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THE PLANT CELL, Vol 7, Issue 1 43-55, Copyright © 1995 by American Society of Plant Biologists
Transient Induction of a Peroxidase Gene in Medicago truncatula Precedes Infection by Rhizobium meliloti
D. Cook, D. Dreyer, D. Bonnet, M. Howell, E. Nony and K. VandenBosch
Department of Plant Pathology and Microbiology, Texas A & M University, College Station, Texas 77843
Although key determinative events of the Rhizobium-legume symbiosis are
likely to precede bacterial infection, no plant genes have been identified
that are expressed strongly prior to infection and nodule morphogenesis. A
subtractive hybridization-polymerase chain reaction technique was used to
enrich for genes induced during the early phases of the R.
meliloti-Medicago truncatula symbiosis. One gene so identified encodes a
putative plant peroxidase protein, which we have named Rip1 for
Rhizobium-induced peroxidase. The accumulation of rip1 transcript was
rapidly and transiently induced by R. meliloti and by the corresponding
lipooligosaccharide signal molecule Nod factor RmIV, which was both
necessary and sufficient for rip1 induction. The duration of maximal rip1
expression coincided with the preinfection period: transcript levels for
rip1 were near maximal by 3 hr postinoculation and declined by 48 hr,
coincident with early infection events and the onset of nodule
morphogenesis. Furthermore, although rip1 induction preceded bacterial
infection by at least 24 hr, the transcript was localized to epidermal
cells in the differentiating root zone that was subsequently infected by
Rhizobium. Thus, a defining feature of the Rhizobium infection court is the
prior induction of rip1 expression.
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