Seaweed extracts could help crops survive increasingly salty soil
Li J, Sun H, Shi Y, Han J, Liu P
Climate Adaptation
If you've ever wondered why plants struggle near roadsides salted in winter or in coastal gardens, this review points to seaweed-based sprays as a practical tool that helps roots keep absorbing water and nutrients even when salt is working against them.
Salty soil is a growing problem for farms and gardens because it messes with how plants take up water and nutrients, sometimes poisoning them outright. Scientists reviewed how extracts from algae and seaweed, packed with natural sugars, hormones, and other compounds, can be applied to crops to switch on the plant's built-in defenses against salt stress. Instead of waiting years to breed salt-tolerant plant varieties, these extracts offer a quicker way to boost a plant's resilience, though getting the approach to work reliably outside the lab is still a challenge.
Key Findings
Algae-derived compounds (polysaccharides, phytohormones, polyols) act as biostimulants that activate plant salt-tolerance pathways, including the SOS (Salt Overly Sensitive) ionic homeostasis pathway.
These elicitors work through both ABA-dependent and ABA-independent hormonal signaling to improve osmotic adjustment and reduce oxidative damage from reactive oxygen species.
Field-scale application remains a major bottleneck despite promising lab results; the review calls for omics integration, synthetic biology, and nanoscale delivery systems to bridge the gap.
chevron_right Technical Summary
Seaweed extracts can help crops survive salty soil by triggering the plant's own stress-defense systems, offering a faster alternative to breeding new salt-tolerant varieties as farmland salinity spreads worldwide.
Abstract Preview
Original paper
Reprogramming Plant Salt Tolerance: A Systems Biology Perspective on Algae-Derived Elicitors and Biostimulants.
Soil salinisation poses a formidable threat to global agricultural productivity. It induces osmotic stress, ion toxicity and systemic oxidative damage in crops. Breeding salt-tolerant varieties is ...
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