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Origin of land plants: do conjugating green algae hold the key?

by Sabina Wodniok, Henner Brinkmann, Gernot Glöckner, Andrew J Heidel, Hervé Philippe, Michael Melkonian, Burkhard Becker
BMC evolutionary biology ()

Abstract

The terrestrial habitat was colonized by the ancestors of modern land plants about 500 to 470 million years ago. Today it is widely accepted that land plants (embryophytes) evolved from streptophyte algae, also referred to as charophycean algae. The streptophyte algae are a paraphyletic group of green algae, ranging from unicellular flagellates to morphologically complex forms such as the stoneworts (Charales). For a better understanding of the evolution of land plants, it is of prime importance to identify the streptophyte algae that are the sister-group to the embryophytes. The Charales, the Coleochaetales or more recently the Zygnematales have been considered to be the sister group of the embryophytes However, despite many years of phylogenetic studies, this question has not been resolved and remains controversial.

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