How land plants evolved from aquatic algae has been a problem attracting much scientific attention. Next-generation Illumina sequencers at the National Institute of Genetics, Japan, were used for most of genome sequencing. Land plants dominate terrestrial flora, and comprise a major part of the food supply.
They have obtained a draft genome sequence sufficient for comparison with the genomes of other organisms. The comparison revealed that after the separation of the ancestor of land plants from Chlamydomonas, a number of genes were acquired before the diversification of land plants. These genes were not found in Klebsormidium nitens. Charophyceae, relatives of land plants, have genomes that present important information to understand how land plants evolved from their ancestors in the Paleozoic era.
By studying the genome sequences in relation to different environmental conditions, it may be possible to analyze and elucidate adaptation mechanisms. Strains were established that could be grown in laboratories and used for genome analysis. This sequence can be referenced in developmental and genetic studies in land plants, and contribute to understanding the evolution of land plants. The one from Lake Kasumigaura appears to be adapted to shallow water with abundant light, while the one from Saijo city is apparently adapted to deep water with lower light levels. Confirm this request You may have already requested this item.
Hori and others led by Prof. Here, we report the draft genome of Chara braunii from Charophyceae, and its comparison to land plants, Klebsormidium nitens, and other green algae. Among them, the Charophyceae form the most complex body plan with reproductive organs, antheridia and oogonia.
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In the present study, we reveal the genome of Chara braunii, which is considered to have separated from land plants to million years ago. The present study successfully revealed the genome sequence of Chara braunii. Chara braunii possesses more transcription factors than other green algae whose genomes have been determined. In fact, in the s, Pringsheim suggested that Chara presently placed in Charophyceae is closely related to land plants. The comparison revealed acquisition of genes before and after the divergence of Charophyceae in the lineage leading to land plants, as well within Charophyceae.
Chara braunii, whose genome is described in the present study, represents the earliest diverging lineage to land plants in the Phragmoplastophyta. Sexual reproductive organs formed on a branchlet. Lineages with published genomes are shown with bold lines.
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