Cytosolic calcium oscillation may induce stomatal oscillation in Vicia faba
Yang H. M., Zhang X. Y., Wang G. X., Li Y., Wei X. P. (2003)
in Plant Science 2003;165:1117-1122 –
Whether guard cell cytosolic calcium ([Ca 2 + ] c y t ) oscillation induced stomatal oscillation was investigated in Vicia faba leaf.
Extracellular Ca 2 + , ABA and H 2 O 2 treatments induced stomata to close in a dose- and time-dependent way. Both steady-state and rapid exchange treatments could first induce a steep decrease in stomatal aperture and then significantly induce stomatal oscillations at small apertures.
Steady-state extracellular Ca 2 + and ABA treatments caused obvious but small and irregular stomatal oscillations, and the oscillations lasted for shorter time, while steady-state H 2 O 2 treatment induced no stomatal oscillation.
Intriguingly, rapid exchange treatments of high [K + ] buffer and high [Ca 2 + ] buffer or high [ABA] buffer induced significant, strong, regular and longer time stomatal oscillations, while no oscillation occurred under H 2 O 2 treatment in the same procedure.
It was likely that [Ca 2 + ] cy t oscillations induced by extracellular Ca 2 + and ABA could induce stomatal oscillations and stomatal oscillations occurred at small apertures.