Abstract
The role of epidermal cell turgor appeared to play a definite role in the regulation of stomatal pore in isolated epidermal peelings of C. colocynthis . Guard cells and their surrounding epidermal cells have different osmotic potentials and absorbing capacities. Plasmolysis in epidermal cells caused by incubating peelings in suitable sucrose solutions, led to the lowering of their turgor potentials, which resulted in opening of the stomata. Any increase in turgor potential of epidermal cells caused by incubation of such peelings in water resulted in closure of stomata. Water from plasmolysed epidermal cells was taken up by guard cells due to greater difference of osmotic potentials between epidermal cells and guard cells than between epidermal cells and the incubation medium. When peelings with plasmolysed epidermal and guard cells were incubated in water, water moved into the guard cells from the medium because of its non-availability in plasmolysed epidermal cells. As the pore opened, the starch in guard cells disappeared, but the cause of this could not be ascertained
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