In this article:

Grapevine (Vitis vinifera L.) leaves subjected to rapid desiccation over several hours showed a rapid loss of chlorophyll α variable fluorescence, the extent of which was affected by light intensity.

Slow stress imposed over several days did not lead to a loss of variable fluorescence until much lower water potentials were reached.

Recovery of the stressed plants revealed considerable osmotic adjustment during slow stress and turgor pressure increased by 0.75 MPa for a 1 MPa decrease in osmotic potential.

The maintenance of turgor pressure associated with osmotic adjustment apparently prevents damage to photosystem ll which occurs during rapidly applied stress or in species incapable of osmotic adjustment.

Osmatic Adjustment during Water Stress protects the Photosynthetic Apparatus against Photoinhibition

1983, Plant Science Letters, vol 30, pages 137-143

csiro 644

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