Cell-specific transcriptomics and knockout reveal aquaporin function in grass stomatal movements.
Ding L, Laurent MJ, Legay S, Aesaert S, Georgery J
Crispr
Understanding exactly how corn and other grass crops regulate water loss through their leaves could lead to drought-resistant varieties that feed more people with less water — critical as heat waves and dry spells become more frequent.
Grass leaves breathe through tiny pores called stomata, and corn's stomata are unusually fast and efficient because they use four cells working together instead of two. Researchers mapped which genes are active in each of these four cells and found that certain water-channel proteins actually keep the pores from opening too wide. When they switched those proteins off using gene editing, the pores opened larger — which could help plants absorb more carbon dioxide but also lose more water.
Key Findings
Guard cells showed higher expression of photosynthesis and chloroplast genes, while subsidiary cells were enriched for lipid transport and metabolism genes — revealing a clear molecular division of labor.
Knocking out ZmPIP1 water-channel proteins specifically in guard cells caused greater stomatal opening than wild-type plants, especially under mild drought conditions.
Aquaporin gene expression varied both by cell type (guard cell vs. subsidiary cell) and by time of day, suggesting dynamic, spatially resolved water transport regulation in grass stomata.
chevron_right Technical Summary
Scientists discovered that water-channel proteins in corn stomata actually limit how wide stomata open, and that the four-cell structure of grass stomata relies on distinct gene activity in each cell type to control water loss efficiently.
Abstract Preview
The high efficiency of grass stomatal movement is believed to be due to their unique four-celled structure, with two dumbbell-shaped guard cells (GCs) flanked by two subsidiary cells (SCs). The mol...
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