Abstract
Polygalacturonase-inhibiting protein (PGIP) is an extracellular leucine-rich repeat (LRR) protein that binds to and inhibits the activity of fungal endopolygalacturonases. Accumulation of PGIP mRNA in near-isogenic lines of Phaseolus vulgarisdiffering only for a single gene ( Are) which confers resistance to the race γ of Colletotrichum lindemuthianumwas followed by Northern blot analysis. In the incompatible interaction, approximately 40h after inoculation and 4h before the observed hypersensitive response, PGIP mRNA reached a level 20-fold higher than the basal level and returned to basal levels by 68h. In the compatible interaction, PGIP mRNA did not significantly increase during the first 68h. An eight-fold induction over the basal level was observed 84h after inoculation. Transcripts returned to basal levels by 100h. These data indicate that an early and rapid pgiptranscript accumulation is associated with the hypersensitive response in bean C. lindemuthianumrace γ interactions.
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