Biological complexity: plants can smell (Introduction)

by David Turell , Wednesday, January 23, 2019, 21:18 (2131 days ago) @ David Turell

Odor molecules can affect their genes:

https://www.sciencedaily.com/releases/2019/01/190123105827.htm

"Plants detect a class of odor molecules known as volatile organic compounds, which are essential for many plant survival strategies, including attracting birds and bees, deterring pests, and reacting to disease in nearby plants. These compounds also give essential oils their distinctive scents.

"Touhara's team exposed tobacco cells and 4-week-old tobacco plants to different volatile organic compounds. They discovered that odor molecules change gene expression by binding to other molecules called transcriptional co-repressors that can turn genes on or off.

"In plants, the odor molecules must move into the cell and accumulate before they affect plant behavior. In animals, odor molecules are recognized by receptors on the outside of cells in the nose and immediately trigger a signaling pathway to recognize the odor and change behavior.

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"'Humans have about 400 odor receptors. Elephants have about 2,000, the largest number in animals. But based on how many transcription factor genes are in plants, plants may be able to detect many more odors than animals," said Touhara."

Comment: Not surprising since plant already use volatile organic compounds in other ways.