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oai:www.ideals.illinois.edu:2142/19582 2023-07-10 col_2142_5131 col_2142_14798 com_2142_5130 com_2142_686 com_2142_397

Pedersen, Wayne L. Simcox, Kevin Dean 2011-05-07T12:12:09Z 2011-05-07T12:12:09Z 10000-01-01 1989 The population structure of three species of fungi pathogenic on Zea mays L.; Cochliobolus carbonum, C. heterostrophus, and Septosphaeria turcica were studied using isozyme analysis. Forty isolates of S. turcica were evaluated using nineteen enzyme stains. Polymorphisms were identified with aspartate aminotransferase (EC 2.6.1.1), fumarase (EC 4.2.1.2), glucose-6-phosphate dehydrogenase (EC 1.1.1.49), and mannose-6-phosphate isomerase (EC 5.3.1.8). Associated electrophoretic and virulence phenotypes were found, indicating that populations exist in S. turcica as asexually propagated clonal groups. Use of the UPGMA method to calculate overall similarity between isolates found that isolates of race 1 were more similar to race 2 than isolates of race 3. Isolates of C. carbonum were found to be polymorphic for aspartate aminotransferase, esterase (EC 3.1.1), glucose phosphate isomerase (EC 5.3.1.9), leucine aminopeptidase (EC 3.4.11), and mannitol dehydrogenase. Races of C. carbonum were found to be associated with specific electrophoretic phenotypes. Phenograms generated by the UPGMA method showed similarity between races 1 and 3, which are highly virulent on maize. Both races were less similar to isolates of race 2, a weak pathogen of maize. No isozyme polymorphisms were detected in isolates of race 0 of C. heterostrophus. One race T isolate showed polymorphisms with esterase and hexokinase. Made available in DSpace on 2011-05-07T12:12:09Z (GMT). No. of bitstreams: 2 license.txt: 4922 bytes, checksum: 910b249b4beec47e7ab768910c8f966f (MD5) 8924943.pdf: 1906453 bytes, checksum: a4305176ce990b4d9fe28b957275598b (MD5) Previous issue date: 1989 Item marked as restricted to the 'UIUC Users [automated]' Group (id=2) by Howard Ding (hding2@illinois.edu) on 2011-05-07T14:38:01Z Item is restricted indefinitely. Restriction data tranferred 2014-07-01T11:15:45-05:00 Original Data Group with Access UIUC Users [automated] Release Date: none Reason: ETDs are only available to UIUC Users without author permission ETDs are only available to UIUC Users without author permission U of I Only AAI8924943 (UMI)AAI8924943 http://hdl.handle.net/2142/19582 eng Copyright 1989 Simcox, Kevin Dean Agriculture, Plant Pathology "Isozyme variation in ""helminthosporium-type"" species pathogenic on maize" text Crop Sciences Crop Sciences University of Illinois at Urbana-Champaign Dissertation Ph.D.