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Bulliform cells are responsible for
When water stressed, large empty bulliform cells lose turgor and become flaccid, causing leaves to curl inward to minimize surface area and transpiration!
In grasses, certain adaxial epidermal cells along the veins modify themselves into large, empty, colourless cells called bulliform cells (or motor cells).
When the bulliform cells have absorbed water and are turgid, the leaf surface is exposed. When they are flaccid due to water stress, they cause the leaves to curl inward to minimize water loss via transpiration.
The primary physiological function is mediating inward curling of leaves in monocots.
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Bulliform cells are hydro-passive motor cells regulating water conservation, not halophytic salt-extruding glands.
Stomatal opening is controlled by the guard cells, not bulliform cells.
Loss of turgor in bulliform cells causes leaves to curl inward to reduce exposed surface area during drought.
Bulliform cells are empty, water-filled cells that do not store carbohydrates.
Attributing stomatal opening/closing to bulliform cells.
"In grasses, certain adaxial epidermal cells along the veins modify themselves into large, empty, colourless cells. These are called bulliform cells. When the bulliform cells in the leaves have absorbed water and are turgid, the leaf surface is exposed. When they are flaccid due to water stress, they make the leaves curl inwards to minimise water loss."
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