III depicts the healthy as well as damaged epidermal and guard cells
of Bougainvillea spectabilis at control and polluted zones, respectively.
3C, 3D, 4A, 4C, 4D), with two large guard cells
surrounding the stoma on either side (Figs.
Nitric oxide and abscisic acid cross talk in guard cells
. Plant Physiology 128: 790-792.
Abscisic acid introduced into transpiration stream accumulates in the guard cell
apoplast and causes stomatal closure.
Carbonic anhydrases are upstream regulators of CO[sub.2]-controlled stomatal movements in guard cells
. Nat Cell Biol 2010.
endoplasmic reticulum (ER) and a rough Guard cells
The shape of the guard cells
together and also the relation between polar and equatorial diameters of the stomata are indicative of its functionality (Rocha et al., 2007).
The guard cells
length on both surfaces was 22.3 [+ or -] 1.2 [micro]m; the guard cells
density on the adaxial surface was 345.7 [+ or -] 0.7 mm .
The number of stomata per unit area was 4, all the stomata were open and no closed stomata were present, the average length of guard cells
was 27.5 (25-30) um and average width of guard cells
was 6 (5-7) um.
Other than affecting the bulliform cells, water deficit also causes the guard cells
to lose their turgor pressure , thus leading to stomatal closure .