Sweet shaping of root system architecture under water deficit.
Singh D, Awasthi P, Sharma A, Samtani H, Shukla BN
Plant Signaling
Every time a drought summer cracks your garden soil, your plants are already running this exact sugar-based navigation system to hunt for moisture — understanding it is the first step toward breeding vegetables and flowers that do it better.
When a plant runs low on water, it redirects its roots to grow toward where moisture might be found. Researchers found that the plant uses sugar as a signal to kick off this redirection, and that sugar works partly by dialing down a plant hormone that would otherwise keep roots growing straight. A third player, a growth-regulating protein, acts as the middle manager between sugar and that hormone to fine-tune which way the roots ultimately point.
Key Findings
Glucose (sugar) is a key signal that causes Arabidopsis roots to change growth direction under water-deficit stress, not just a passive energy source.
A plant hormone called cytokinin opposes this redirection — it suppresses root deviation during drought, and glucose counters it by downregulating cytokinin signaling.
The glucose–TOR signaling pathway and cytokinin pathway interact antagonistically, both ultimately acting through auxin transport to control root orientation.
chevron_right Technical Summary
Scientists discovered that sugar (glucose) helps plant roots steer toward water during drought by overriding a competing hormone signal. This finding reveals a molecular switch plants use to reshape their root systems when water is scarce.
Abstract Preview
Root growth direction under water-deficit conditions is critical for plant survival. Increasing agar concentration in the growth medium simulates stress conditions, limiting water availability. Our...
open_in_new Read full abstractAbstract copyright held by the original publisher.
Species Mentioned
Was this useful?
Chloroplast Genome Editing Eliminates Gluten Immunogenicity in Triticum aestivum
It could mean that people with celiac disease — roughly 1 in 100 worldwide — may one day safely eat bread made from real wheat, without sacrificing the taste...
Arabidopsis (rockcress) is a genus of small flowering plants in the cabbage and mustard family, Brassicaceae. Arabidopsis species are native to temperate and subarctic Eurasia and North America, North Africa, and the mountains of eastern tropical Africa. This genus is of great interest since it c...