STUDIES OF ISOZYME PATTERNS IN NULLISOMIC-TETRASOMIC COMBINATIONS OF HEXAPLOID WHEAT*
Abstract
Thirty-eight wheat strains, each nullisomic for one chromosome and tetrasomic for a homoeologous (related) one, were analyzed electrophoretically for 12 different enzymes, and a gene (or genes) for alkaline phosphatase was localized to chromosomes 4B and 4D. The other 11 enzymes showed no significant electrophoretic variation. The fact that the only mutants observed affect the same enzyme favors the concept that rigorous selection operates in the polyploids both to preserve certain types of variants and to eliminate others.
Footnotes
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↵ † Department of Human Genetics, University of Michigan Medical School, Ann Arbor, Michigan 48104.
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↵ ‡ Department of Genetics, Curtis Hall, University of Missouri, Columbia, Missouri 65201.
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↵ * Cooperative investigations of the Departments of Human Genetics and Medicine (Simpson Memorial Institute), University of Michigan, Ann Arbor, and the Crops Research Division, Agricultural Research Service, U.S. Department of Agriculture, Columbia, Missouri. The work was supported by USPHS research grant AM 09381, USPHS Career Development Award 1-K3-AM-7959 (GJB), and USAEC contract AT(11-1)-1552. Journal Series no. 5740 of the Missouri Agricultural Experiment Station.
