A PRELIMINARY SURVEY OF ALLOZYME VARIATION IN THE GENUS PLAGIOTHECIUM (PLAGIOTHECIACEAE, BRYOPSIDA)

抄録

  The systematic status of a number of Plagiothecium species is still uncertain, and is difficult to determine with conventional taxonomical methods. In the present study horizontal starch gel electrophoresis is applied in order to investigate the genetic relationships between six taxa of the genus Plagiothecium, sampled in the Netherlands. To enable outgroup comparisons, Herzogiella seligeri also is included in this study. Twelve enzyme systems are studied (MDH, ME, ICD, PGD, SOD, GOT, HK, PGM, ACP, AMY, TPI, GPI), representing twenty presumptive loci. To facilitate the interpretation of the allozyme patterns, counts of chromosome numbers are made from mitotic divisions.

  The electrophoretic data are used to tentatively propose a phylogeny for the taxa under study, and the mean gene diversity within populations is compared between species with different breeding systems.