Ch. Goh et al., Osmotic stress induces inactivation of photosynthesis in guard cell protoplasts of Vicia leaves, PLANT CEL P, 42(10), 2001, pp. 1186-1191
Guard cell protoplasts isolated from Vicia leaves showed a strong suppressi
on of the photosynthesis under hypotonic conditions, as reflected by change
s in the chlorophyll fluorescence characteristics. The response was reversi
ble as well. Mesophyll cell protoplasts did not show any lowering of photos
ynthetic activity under hypo-osmotic conditions. This result indicates that
the response was guard cell specific.