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Molecular diversity and relationships among Elymus trachycaulus, E. subsecundus, E. virescens, E. violaceus, and E. hyperarcticus (Poaceae: Triticeae) as determined by amplified fragment length polymorphism

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Morphological similarity among E. trachycaulus, E. virescens, E. violaceus, and E. hyperarcticus has often been noted. Taxonomists have tried to discriminate among these taxa using morphological characters and a number of different relationships among them have been suggested. However, the genetic relationships among these taxa are still unknown. AFLP analysis was used to characterize the molecular diversity of these taxa and to examine genetic relationships among them. A high degree of genetic identity was apparent among 7 accessions of E. virescens. The similarity values ranged from 0.90 to 0.99 with an average of 0.94. The mean similarity values among 3 E. hyperarcticus and among 5 E. violaceus accessions were 0.84 (0.81–0.87) and 0.77 (0.66–0.90), respectively. The similarity values among 17 E. trachycaulus accessions ranged from 0.49 to 0.92 with an average of 0.75. The 5 accessions of E. subsecundus displayed high variation, with similarity values between 0.52 and 0.68 and a mean value of 0.59. Both maximum-parsimony (MP) and neighbor-joining (NJ) analyses showed that all 7 accessions of E. virescens formed a clade, indicating a monophyletic origin. On the other hand, Elymus trachycaulus, E. subsecundus, and E. violaceus were each paraphyletic and separated into different genetically distinct groups. Among these 5 taxa, E. virescens was genetically similar to E. trachycaulus, and E. violaceus was genetically similar to E. hyperarcticus.

La similitude morphologique entre les espèces E. trachycaulus, E. virescens, E.violaceus et E. hyperarcticus a souvent été notée. Les taxonomistes ont tenté de distinguer ces taxons à l’aide de marqueurs morphologiques et plusieurs relations différentes entre eux ont été suggérées. Cependant, les relations génétiques entre ces espèces demeurent inconnues. Une analyse AFLP a été employée pour mesurer la diversité moléculaire au sein de ces taxons et pour examiner les relations entre ceux-ci. Un degré élevé d’identité génétique était apparent parmi sept accessions de l’E. virescens. Les similitudes variaient entre 0,90 et 0,99 pour une moyenne de 0,94. Les valeurs moyennes de similitude parmi trois accessions de l’E. hyperarcticus et cinq accessions de l’E. violaceus étaient respectivement 0,84 (0,81–0,87) et 0,77 (0,66–0,90). Les similitudes parmi 17 accessions de l’E. trachycaulus variaient entre 0,49 et 0,92 pour une moyenne de 0,75. Les cinq accessions de l’E. subsecundus montraient une grande variation, les similitudes allant de 0,52 à 0,68 pour une moyenne de 0,59. Des analyses de parcimonie maximale et «neighbor joining» ont révélé que les sept accessions de l’E. virescens forment un clade, indiquant ainsi une origine monophylétique. Par contre, les accessions de l’E.trachycaulus, de l’E. subsecundus et de l’E. violaceus sont paraphylétiques et appartiennent à différents groupes génétiques distincts. Parmi ces cinq taxons, l’E.virescens était génétiquement semblable à l’E. trachycaulus et l’E. violaceus était semblable à l’E.hyperarcticus.

Document Type: Research Article

Publication date: September 1, 2006

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  • From its inception in 1957, this international cytogenetics journal has catered to the research areas of the members of the Genetics Society of Canada; traditionally, these have included agriculture, entomology, genetics/cytogenetics, and evolutionary mechanisms. The contents of the journal have evolved as contributors developed new technologies and interests. A 20-member Editorial Board is composed of scientists from around the world. Reviews and commentary from respected experts are often featured.
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