Abstract
Roughly 470 million years ago, the land colonization of plants was one of important events of biological evolution, and initiated the establishment of the modern earth's environment. The process of the land colonization of plants is a multifaceted topic, paleontology, biology, geology and so on. To elucidate biological determining factors for the land colonization of plants, we investigated organelle DNA of klebsormidium flaccidum (Klebsormidiales, Charophyceae).
In previous studies, phylogenetic and cell-biological analyses supported that land plants ancestor derived from Charophyte. The morphology of Klebsormidium is extremely simple in Charophyte. However Klebsormidium is widely distributed in both fresh water and land, and adapt to dry and oligotrophic environments. Thus, to know how klebsormidium adapt to land environment is a key to clarify biological determining factors for the land colonization of plants.
In this presentation, we report comparative analysis of organelle DNA sequences of klebsormidium and other plants, and discuss causal biological factors for the land colonization by plants.
