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Updated: Feb 19, 2026

Robotic Sensing and Stimuli Provision for Guided Plant Growth
Published on: July 1, 2019
Growth-mediated plant movements: hidden in plain sight
Stacey L Harmer1, Christopher J Brooks1
1Department of Plant Biology, University of California, One Shields Avenue, Davis, CA 95616, USA.
Plants use slow, growth-mediated tropic movements for survival. Recent studies reveal molecular mechanisms for phototropism, gravitropism, hydrotropism, and autostraightening, involving hormones like auxin and abscisic acid.
Area of Science:
- Plant Biology
- Molecular Biology
- Developmental Biology
Background:
- Plants exhibit slow, growth-mediated tropic movements essential for survival.
- Understanding these movements is key to plant adaptation and development.
Purpose of the Study:
- To review recent molecular insights into plant tropic movements.
- To highlight the roles of various signaling pathways in tropisms.
Main Methods:
- Molecular genetic studies
- Physiological studies
- Mechanistic modeling
Main Results:
- Lateral auxin gradients are crucial for gravitropism and phototropism.
- Abscisic acid signaling mediates root hydrotropism.
- Mechanosensing is implicated in autostraightening, a proprioceptive response.
Conclusions:
- Auxin signaling is not the sole mechanism for all tropisms.
- Multiple signaling pathways, including abscisic acid and mechanosensing, are involved.
- Interactions between tropic signaling and other sensory processes are increasingly understood.
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