Genetic architecture of western gall rust (Peridermium harknessii) in California pine forests.

Vogler, D. R., Kinloch, B. B., Jr., Cobb, F. W., Jr., Libby, W. J., Jr., and Popenuck, T. L. 1988.

Department of Plant Pathology, University of California, Berkeley, CA 94720, and U.S.D.A., Forest Service, Institute of Forest Genetics, Berkeley, CA 94701.

Phytopathology 78:1555. (1988)

Aeciospores were collected from single galls on seven native pine species from coastal and inland mountain forests in California. Sieved and air-dried spores were ground in glass tissue grinders or homogenized with a Mini-BeadBeater, and then subjected to starch gel electrophoresis in each of four gel-buffer systems. Resolution was obtained for 16 enzymes encoded by 18 putative loci. As reported previously (D. R. Vogler, Phytopathology 77:1242), all enzyme loci from coastal California isolates were monomorphic. Seven loci from Cascade and Sierra Nevada mountain isolates were polymorphic among sites, but monomorphic within sites; the remaining 11 loci were mostly monomorphic and similar to those in coastal isolates. These results strongly suggest that P. harknessii propagates clonally and is very homogeneous genetically.
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