Cells' hidden anchors to their walls control drought toughness
Rui Y, Zaoralová M, Dwyer WP, Reyes AV, Grismer TS
Plant Signaling
Every wilting tomato plant or drought-stressed lawn is experiencing this exact cellular tug-of-war, and understanding it could eventually help breeders build crops and garden plants that bounce back faster from dry spells.
Inside every plant cell, a thin membrane sits pressed against a stiffer outer wall, kind of like wallpaper glued to a wall. Researchers found two molecular systems that control how tightly that membrane sticks to the wall, and one of them, built around cellulose-making machinery, makes cells much better at surviving dehydration. The other system works against it, and a newly identified protein pair acts as the referee between the two, which helps explain why some plants handle drought better than others at the cellular level.
Key Findings
Cell wall-plasma membrane attachments, visible during hyperosmotic (dehydration) shock, are controlled by two distinct molecular mechanisms.
Higher density of cellulose synthase complexes (CSCs) at the plasma membrane correlates with greater resistance to hyperosmotic stress, while remorin (REM) proteins act antagonistically to reduce this resistance.
Proximity-labeling proteomics identified SHOU4/4L as remorin-associated proteins that mediate the balance between the two attachment mechanisms.
chevron_right Technical Summary
Scientists discovered how plant cells anchor their outer skin (the membrane) to their cell wall, a connection that determines how well the plant survives drought and water loss. Two competing molecular systems control this attachment, and tipping the balance toward one of them makes cells noticeably more resistant to dehydration stress.
Abstract Preview
Original paper
Plant cell wall-plasma membrane attachments mediate stress resilience through cellulose synthase complexes and remorins.
The outer cell surface of an organism is the frontline for detecting and responding to environmental stimuli. In plants, this interface consists of the plasma membrane that lies beneath the cell wa...
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