Rice leaves evolved super water-repellent surfaces long before farming began
Zhu T, Hiraiwa A, Aiga S, Mimura M, Yoshikawa T
Crop Improvement
The way rain beads up and rolls off a rice leaf instead of soaking in is a defense system that keeps fungal spores from taking hold, and understanding it could help breeders build sturdier, disease-resistant crops.
Some rice leaves are so water-repellent that droplets form near-perfect spheres and roll right off, a trait scientists call superhydrophobicity. By studying mutant rice plants, everyday farm varieties, and wild rice relatives, researchers found this water-shedding power comes mainly from the amount and type of waxy coating on the leaf, with tiny bump-like structures called papillae adding an extra boost. Surprisingly, this trait shows up in wild ancestral rice too, meaning it evolved on its own in nature rather than being bred in by farmers.
Key Findings
Water repellency (measured as static contact angle >150°) depends primarily on the quantity and quality of epicuticular wax coating the leaf surface, not just surface structure.
Papillae (small surface bumps) contribute only minorly to overall water repellency but appear essential for achieving true superhydrophobicity.
At least five previously identified genes regulate these wax and papillae traits, and superhydrophobicity is present in both cultivated rice and wild Oryza species, indicating it evolved independently of domestication.
chevron_right Technical Summary
Rice leaves can repel water so effectively that droplets bead up and roll off, and scientists have now traced this waxy, water-shedding trait to specific genes and surface structures. The discovery could help breeders engineer crops that resist disease and shed rain more effectively.
Abstract Preview
Original paper
Structural, genetic, and adaptive basis of superhydrophobicity in rice leaves.
In most plants, leaf surfaces exhibit water-repellent properties, which protect against pathogens and weather. Plants such as lotus and rice have evolved outstanding water-repellent properties, ter...
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