Photocaged abscisic acid enhances rice salt tolerance via sustained signaling and multilevel stress modulation.
Yin Q, Zhang Y, Hu Y, Li A, Shi L
Crop Improvement
Rice paddies in coastal and arid regions are increasingly swamped by salt — and this light-activated hormone delivery could let farmers apply a single treatment that keeps working across days of stress rather than washing out in hours.
Plants make a hormone called abscisic acid that acts like a stress alarm — it tells the plant to tighten up, conserve water, and activate defenses when conditions get tough. The problem is that sunlight destroys it almost immediately, so spraying it on crops barely helps. Researchers built a molecular 'cage' around the hormone that sunlight slowly unlocks over time, giving rice plants a sustained boost that helped them survive salty water far better than untreated plants.
Key Findings
NV-ABA (the best-performing caged derivative) increased rice seedling shoot fresh weight by 36% and root fresh weight by 18% compared to free ABA under salt stress.
All three photo-caged ABA derivatives showed prolonged bioactivity in seed germination assays for both Arabidopsis and rice, confirming sustained release.
Sustained expression of four stress-response genes (OsP5CS1, OsP5CR, OsNHX1, OsRAB16A) was detected, indicating prolonged activation of salt-tolerance pathways.
chevron_right Technical Summary
Scientists engineered a light-activated wrapper for abscisic acid (ABA), a plant stress hormone, that slowly releases ABA in sunlight instead of degrading instantly. Rice seedlings treated with the best version survived salt stress significantly better, with heavier shoots and roots than those given plain ABA.
Abstract Preview
Although abscisic acid (ABA) is essential for improving plant tolerance to salt stress, its practical use in agriculture is severely limited by rapid photodegradation, poor lipophilicity, and short...
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