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Isoenzyme variation in the grass genus Elymus (Poaceae)

2008; BioMed Central; Volume: 117; Issue: 1 Linguagem: Inglês

10.1111/j.1601-5223.1992.tb00002.x

1601-5223

Vello Jaaska,

Genetic Mapping and Diversity in Plants and Animals

HereditasVolume 117, Issue 1 p. 11-22 Open Access Isoenzyme variation in the grass genus Elymus (Poaceae) VELLO JAASKA, Corresponding Author VELLO JAASKA Department of Botany and Mycology, Institute of Zoology and Botany, Estonian Academy of Sciences, Tartu, EstoniaDepartment of Botany and Mycology, Institute of Zoology and Botany, EE2400 Tartu, EstoniaSearch for more papers by this author VELLO JAASKA, Corresponding Author VELLO JAASKA Department of Botany and Mycology, Institute of Zoology and Botany, Estonian Academy of Sciences, Tartu, EstoniaDepartment of Botany and Mycology, Institute of Zoology and Botany, EE2400 Tartu, EstoniaSearch for more papers by this author First published: August 1992 https://doi.org/10.1111/j.1601-5223.1992.tb00002.xCitations: 8AboutPDF ToolsExport citationAdd to favoritesTrack citation ShareShare Give accessShare full text accessShare full-text accessPlease review our Terms and Conditions of Use and check box below to share full-text version of article.I have read and accept the Wiley Online Library Terms and Conditions of UseShareable LinkUse the link below to share a full-text version of this article with your friends and colleagues. Learn more.Copy URL Share a linkShare onFacebookTwitterLinkedInRedditWechat Abstract Variation of aspartate aminotransferase (AAT), aliphatic and aromatic alcohol dehydrogenases (ADH and AAD), esterase (EST), 6-phosphoglyconate dehydrogenase (PGD), and superoxide dismutase (SOD) isoenzymes encoded by 16 loci has been studied in about 60 Elymus species by means of polyacrylamide gel electrophoresis. Fixation of isoenzyme heterozygosity characteristic of alloploids is inherent to most Elymus species, evidenced by frequent occurrence of symmetric three-banded electrophoretic phenotypes of several dimeric enzymes. A fast-moving dimeric EST-A distinguishes two different types of alloploids with one common genome and the second, divergent, genome with distinctly different EST-A electromorphs. SOD-B, a cytosolic isoenzyme, revealed in most species fixed heterozygosity, combining four frequent and three rare electromorphs, whereas the chloroplastic SOD-A is mostly homozygous for a common one. Hexaploids frequently showed double heterozygosity of SOD-B with six-banded phenotypes. The two basic isoenzymes of AAT reveal homo- and heterozygous phenotypes with 5–7 homoeoallelic electromorphs. ADH showed up to six electromorphs, frequently in heterozygous phenotypes. The isoenzyme data are considered to support a view about a multiple polyphyletic origin of the genus Elymus through alloploidy followed by further-differentiation at the polyploid level. References Barkworth, M. E. and Dewey, D. R. 1985. Genomi-cally based genera in the perennial Triiiceae of North America: Identification and membership. Am. J. Bot. 72: Ibl - 776. Dewey, D. R. 1970. Hybrids and induced amphiploids of Agropyron dasystachyum × Agropyron caninum. Bot. Gaz. 131: 342– 348. Dewey, D. R. 1974. Cytogenetics of Elymus sibiricus and its hybrids with Agropyron tauri, Elymus canadensis, and Agropyron caninum. Bot. Gaz. 135: 80– 87. Dewey D. R. 1979. 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