An asymmetrical cell division occurs in protodermal cells resulting in one large cell that is fated to become a pavement cell and a smaller cell called a meristemoid that will eventually differentiate into the guard cells that surround a stoma.
42.
The best preserved is circular, around 35 �m in diameter, with two guard cells . " Hollandophyton " was ( at least in 2002 ) the oldest fossil on which both stomata and sporangia have been found.
43.
As this character can only be examined by microscope, and the ranges of individual guard cell size overlap, some care is required in its use; 30 measurements from a single pinna were used to obtain an average length in previous studies.
44.
Anion channels have several major functions in controlling stomatal closing : The resulting release of negatively charged anions from guard cells results in an electrical shift of the membrane to more positive voltages ( depolarization ) at the intracellular surface of the guard cell plasma membrane.
45.
Anion channels have several major functions in controlling stomatal closing : The resulting release of negatively charged anions from guard cells results in an electrical shift of the membrane to more positive voltages ( depolarization ) at the intracellular surface of the guard cell plasma membrane.
46.
Plants require potassium ions ( K + ) for protein synthesis and for the opening and closing of stomata, which is regulated by proton pumps to make surrounding guard cells either source organs, and maintenance of cation : anion balance in the cytosol and vacuole.
47.
In 1954, Herb Wagner, who did not yet have access to live material, noted that the size of the guard cells in " A . " ?" kentuckiense " suggested that it was triploid, consistent with its proposed parentage.
48.
Ion release from guard cells causes stomatal pore closing : Other ion channels have been identified that mediate release of ions from guard cells, which results in osmotic water efflux from guard cells due to osmosis, shrinking of the guard cells, and closing of stomatal pores ( Figures 1 and 2 ).
49.
Ion release from guard cells causes stomatal pore closing : Other ion channels have been identified that mediate release of ions from guard cells, which results in osmotic water efflux from guard cells due to osmosis, shrinking of the guard cells, and closing of stomatal pores ( Figures 1 and 2 ).
50.
Ion release from guard cells causes stomatal pore closing : Other ion channels have been identified that mediate release of ions from guard cells, which results in osmotic water efflux from guard cells due to osmosis, shrinking of the guard cells, and closing of stomatal pores ( Figures 1 and 2 ).
