Natural genetic engineering allowed plants to move from water to land, according to a new study by an international group of scientists from Canada, China, France, Germany, and Russia.
Microscopic image of Spirogloea muscicola, a new species of algae identified as part of a study that shows how plants evolved to move from water to land [Credit: Barbara & Michael Melkonian] |
The movement of plants from water to land was made possible when genes from soil bacteria were transferred to algae through a process called horizontal gene transfer. Unlike vertical gene transfer, such as the transfer of DNA from parent to child, horizontal gene transfer occurs between different species.
"For hundreds of millions of years, green algae lived in freshwater environments that periodically fell dry, such as small puddles, river beds, and trickling rocks," explained Michael Melkonian, professor in the University of Duisburg-Essen in Germany. "These algae mingled with and received key genes from soil bacteria that helped them and their descendants to cope with the harsh terrestrial environment and eventually evolve into the land plant flora that we see today."
The study is part of an international project focused on sequencing the genomes of more than 10,000 plant species. The discovery was made in the process of sequencing two particular algae, one of them a new species (Spirogloea muscicola) being introduced to the community through this publication.
"The approach that we used, phylogenomics, is a powerful method to pinpoint the underlying molecular mechanism of evolutionary novelty," said Shifeng Cheng, first author and principal investigator from Agricultural Genome Institute at Shenzhen, Chinese Academy of Agricultural Sciences.
The study was published in Cell.
Author: Katie Willis | Source: University of Alberta [November 14, 2019]
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