Protein signaling cascade helps explain how plants respond to touch
Plants cannot run away when the wind picks up, rain lashes down or a hungry herbivore begins chewing on their leaves. Instead, they must sense their surroundings and adapt. Now, researchers have uncovered an important piece of the puzzle of what happens inside plants when they are exposed to touch, injury or other physical stimuli.
Researchers have unveiled the molecular mechanism behind plants' responses to touch and physical stress. The team examined Arabidopsis thaliana, a weed related to mustard and cabbage, subjecting it to mechanical stimulation. They discovered that three specific proteins, known as MAP kinases, are activated within a minute of stimulation.
These proteins form a sequential cascade, passing signals that alter gene activity and impact plant growth. This signaling pathway, comprising MAPKKK3/4/5, MKK4/5, and MPK3/6, was previously unknown but crucial for understanding how plants sense and adapt to their environment. The findings, published in Nature Communications, reveal that mechanical stress influences plant growth through recurring stimulation, a process called thigmomorphogenesis.
This insight into plants' molecular responses could aid in developing strategies to protect crops against lodging and drought, contributing to the understanding of how plants cope with environmental changes.
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