Differential susceptíbility of mesophyll CO2 exchange to ozone in soil- or sand-grown Phaseolus vulgaris L. plants

Title:

Differential susceptíbility of mesophyll CO2 exchange to ozone in soil- or sand-grown Phaseolus vulgaris L. plants

Creator:

Moldau, H. and Kull, O.

Identifier:

https://cdk.lib.cas.cz/client/handle/uuid:695aeca1-5b92-4880-bb42-538df6ec5c0d
uuid:695aeca1-5b92-4880-bb42-538df6ec5c0d
urnnbn:urn:nbn:cz:aba007-000fcv

Type:

model:internalpart and TEXT

Format:

print

Description:

Similar-aged leaflets of kidney beán plants grown either in soii or sand culture but otherwise under identical laboratory conditions, were exposed to acute O3 concentrations of 0.5 to 0.7 pmol mol"l for 1-1.5 h with a 15 to 20 min respite interval in the middle of the ozonation period. The CO2 exchange versus leaf intemal CO2 concentration relationships were determined just before ozonation, during respite period and immediately after the treatment. Under comparable absorbed O3 fluxes the calculated mesophyll conductance (gn,) and measured C02-saturated photosynthesis (Pj) in leaflets of sand-grown plants declined more rapidly than in leaflets of soil-grown plants. A rise in the CO2 compensation concentration in the sand-grown plants was also more pronounced. About 20 % greater thickness of leaves of the sand-grown plants was probably not the cause for their higher susceptíbility to absorbed O3. From the proportíonal decline in ^nd Pg, it is concluded that possible differences in patchiness of stomatal closure under O3 were also not the cause. A weaker O3 defence systém in the mesophyll cells of the sand- grown plants may be the cause of their greater sensitivity to absorbed O3.

Language:

Multiple languages

Rights:

http://creativecommons.org/licenses/by-nc-sa/4.0/
policy:public

Coverage:

37-44 and 55-62

Source:

Photosynthetica | 1993 Volume:28 | Number:1

Harvested from:

CDK

Metadata only:

false