Ozone alters the intercellular distribution of Calcium (Ca2+) in cereal leaf epidermis [abstract]

Cuin, T.A.; Ashenden, T.W.; Deri Tomos, A. 1996 Ozone alters the intercellular distribution of Calcium (Ca2+) in cereal leaf epidermis [abstract]. In: Abstracts CAPER '96. Institute of Grassland & Environmental Research, 21. (Unpublished)

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Ozone is known to damage membranes in leaf tissue. This is likely to have an effect on both the intra- and the inter-cellular compartmentation of solutes found in leaves. Vacuolar Ca'­ was measured in individual epidermal cells of ozone-treated (70 ppb) and control barley leaves, by means of micro-droplet X-ray microanalysis. Significantly higher Ca'; concentrations were found in ozone fumigated plants. Stomatal conductance was reduced in ozone fumigated plants during, and also the day following exposure. Turgor pressure(P) in both transpiring and non-transpiring tissue was reduced in individual cells in 03-treated plants. The osmotic pressure (re) was found to be unaltered. Therefore, 03 makes the water potential (1) more negative. The decrease in 'I' was considerably greater than any change in the wall hydrostatic tension indicating that the 03-induced decrease in 1 is due to an increase in wall re. The ozone-induced increase in cell wall re may be due either to increased solute leakage from the cells or to an impaired solute uptake system. In control plants a hydrostatic pressure gradient appeared to occur in the cell wall away from the stomata. This was abolished by 03. The water relations, and stomatal conductance measurements show, independently, that the increase in Ca'" i n 03-trcated plants is not due to an increase in transpiration. These results support the hypothesis that ozone causes changes to membrane permeability.

Item Type: Publication - Book Section
Programmes: CEH Programmes pre-2009 publications > Other
CEH Sections/Science Areas: _ Pre-2000 sections
Date made live: 16 Apr 2014 12:39 +0 (UTC)

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