Unraveling The Secret Lives Of Ancient Plants

Scientists in Japan have sequenced the liverwort’s genome to better understand the evolution and development of land plants.

AsianScientist (Nov. 10, 2017) – In a study published in Cell, scientists in Japan, in collaboration with over 40 universities and research institutes worldwide, have sequenced the genome of the common liverwort to better understand land plant evolution and development.

All organisms carry patterns in their DNA that scientists can analyze to decipher where and when a species diverged on the evolutionary tree. These studies can reveal how a particular species evolved to become the organism we know today.

In this study, a team of researchers led by Professor Takayuki Kohchi and colleagues at Kyoto University have unraveled the genome of the common liverwort—Marchantia polymorpha—gaining new insight into how the modest land plant evolved.

“All land plants, from moss on rocks to trees that flower, evolved from a common ancestral algal species that colonized land about 500 million years ago,” Kohchi explained. “The liverwort diverged from other land plants at the earliest stage of evolution, and therefore still possesses ancestral characteristics of plant species that followed.”

Liverworts have been used extensively in plant research since they were first studied in the late Middle Ages. In the past few years, Kohchi and his colleagues had developed various molecular and genetic techniques that opened the door to improved analysis, especially for the study of plant genetics.

Using these techniques, the team deciphered the liverwort’s roughly 20,000 genes, discovering in part the low level of genetic redundancy that controls the plant’s development and physiology.

“Flowering plants have redundant copies of vital genes in their DNA, so that if something goes wrong, there’s a backup,” said Kohchi. “And while liverworts have the fundamental ancestral versions of basic mechanisms to keep plants alive, these are exceedingly simple.”

Based on these findings, the lowly liverwort is now considered a key model plant for molecular and genetic studies, providing hints that could help the development of future agricultural applications and plant breeding technologies.

“Now that we know the liverwort genome, we can begin to decipher the functions of each individual gene, and how these evolved in later plant species,” said Kohchi.

The article can be found at: Bowman et al. (2017) Insights into Land Plant Evolution Garnered from the Marchantia polymorpha Genome.


Source: Kyoto University; Photo: Kohchi Lab.
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