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Ribosome Content of Various Spore Forms of Phytophthora spp.. J. V. Leary, Assistant Professor, Department of Plant Pathology, University of California, Riverside 92502; J. R. Roheim(2), and G. A. Zentmyer(3). (2)(3)Graduate Student, and Professor, respectively, Department of Plant Pathology, University of California, Riverside 92502, (2)Present address: Department of Plant Pathology, University of Nebraska, Lincoln 68508. Phytopathology 64:404-408. Accepted for publication 11 October 1973. DOI: 10.1094/Phyto-64-404.

Ribosomes and polysomes isolated from swimming zoospores, cysts, and chlamydospores of Phytophthora spp. were characterized. No ribonucleoprotein particles typical of 80S ribosomes or ribosomal subunits could be isolated from the dormant oospore under any of the conditions utilized. Subribosomal ribonucleoprotein particles of undetermined size, low levels of ribosomal RNA, and ribosomal proteins were isolated from oospores, indicating that de novo synthesis of ribosomes would not be required to initiate protein synthesis for germination.