Man's impact on flax evolution more limited than thought

Arabidopsis thaliana
Arabidopsis thaliana. Credit: Wikipedia.

Flax naturally adapted to new environments rather than by human influence due to a set of genes that enable it to change its architecture according to researchers from the School of Life Sciences at the University of Warwick.

The crop flax has a set of genes in it that make the plant able to adapt to its surroundings, and their ability to do so overpowers .

Flax has PEBP (phosphatidyl ethanolamine-binding protein) genes within it that affect flowering time and plant architecture. One such gene, LuTFL1, has a wild version in European wild populations of flax.

Flax became domesticated 10,000 years ago in the Near East, where it was exploited for its larger oil laden seeds. It moved into Europe around 8,000 years ago, whereupon domesticated flax adapted to Northern Latitudes by taking on the wild version of LuTFL1, which changed the flowering time and architecture of the plant, making it tall and better able to survive in Northern conditions.

However, the seeds became small, so despite artificial selection for oil content, the plant's adaptation made it better suited for other purposes such as fibre.

The were studied through heterologous expression in Arabidopsis thaliana, essentially taking the DNA from the Flax and putting into the Arabidopsis plant to see what they would do.

The team found that the Arabidopsis plant changed in the way that they had predicted by flowering later and growing taller in a similar way to specialized fibre variety flaxes.

Professor Robin Allaby from the School of Life Sciences at the University of Warwick comments:

"This research shows that flax adapted naturally to new environments, but actually over powered artificial selection in doing so. More broadly, this shows that the pressures of natural selection can be more than a match against artificial selection."


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More information: Rafal M. Gutaker et al. Flax latitudinal adaptation at LuTFL1 altered architecture and promoted fiber production, Scientific Reports (2019). DOI: 10.1038/s41598-018-37086-5
Journal information: Scientific Reports

Citation: Man's impact on flax evolution more limited than thought (2019, January 30) retrieved 21 September 2019 from https://phys.org/news/2019-01-impact-flax-evolution-limited-thought.html
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Jan 30, 2019
Silliness. Hunter-gatherers may have valued flax seeds, but would not have cultivated it. But the first settlers depended on fish for most of their protein. Given nets, people can catch plenty of fish if there is a river or lake nearby. Even a marsh or a creek in some areas would provide enough animal protein for a small town. So early agricultural settlements would develop flax for nets (fibre) rather than seeds. The other piece of the puzzle is grain. Rice, corn, wheat and other food grains were also cultivated. However, there the goals of cultivation were year-to-year reliability, and amount of food per person involved in growing the crops. Early grains did not even produce a starvation diet. But fish as a staple food, along with seasonal grains, fruits, nuts, and meat from hunting, would keep a population growing and well fed.

Why keep working on food grains until they could provide more than one persons food per farmer? Variety. Same with fruits and nuts.

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