The phylogeny of land plants: A cladistic analysis based on male gametogenesis |
| |
Authors: | David J. Garbary Karen S. Renzaglia Jeffrey G. Duckett |
| |
Affiliation: | (1) Department of Biology, St. Francis Xavier University, B2G 1C0 Antigonish, Nova Scotia, Canada;(2) Department of Biological Sciences, East Tennessee State University, 37614 Johnson City, Tennessee, USA;(3) School of Biological Sciences, Queen Mary and Westfield College, Mile End Road, E1 4NS London, U.K. |
| |
Abstract: | A cladistic analysis was carried out to resolve phylogenetic pattern among bryophytes and other land plants. The analysis used 22 taxa of land plants and 90 characters relating to male gametogenesis.Coleochaete orChara/Nitella were the outgroups in various analyses using HENNIG86, PAUP, and MacClade, and the land plant phylogeny was unchanged regardless of outgroup utilized. The most parsimonious cladograms from HENNIG86 (7 trees) have treelengths of 243 (C.I. = 0.58, R.I. = 0.82). Bryophytes are monophyletic as are hornworts, liverworts, and mosses, with hornworts identified as the sister group of a liverwort/moss assemblage. In vascular plants, lycophytes are polyphyletic andSelaginella is close to the bryophytes.Lycopodium is the sister group of the remaining vascular plants (minusSelaginella). Longer treelengths (over 250) are required to produce tree topologies in which either lycophytes are monophyletic or to reconstruct the paraphyletic bryophyte phylogeny of recent authors. This analysis challenges existing concepts of bryophyte phylogeny based on more classical data and interpretations, and provides new insight into land plant evolution. |
| |
Keywords: | Bryophytes ferns gymnosperms seed plants land plants Antheridia cladistics gametogenesis phylogeny spermatogenesis |
本文献已被 SpringerLink 等数据库收录! |
|