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Differential Enzyme Synthesis by Haploid and Diploid Forms of Verticillium albo-atrum. C. R. Howell, Research Plant Pathologist, Crops Research Division, ARS, USDA, Lubbock, Texas 79401. Phytopathology 60:488-490. Accepted for publication 17 October 1969. DOI: 10.1094/Phyto-60-488.

Haploid and diploid forms of two strains of Verticillium albo-atrum were virulent and avirulent, respectively, to cotton. Both in agar cultures and in liquid cultures, haploid forms released approximately 3.5 times as much polygalacturonase, 5.5 times as much polyphenol oxidase, and 10 times as much beta-glucosidase to the medium as did corresponding diploid forms during 5 daysí incubation at 25 C. Wide differences in enzyme-synthesizing capacity, exhibited by haploid and diploid forms of V. albo-atrum, may account for differences in their virulence to cotton (Gossypium hirsutum).