Journal
PLANT BIOSYSTEMS
Volume 142, Issue 3, Pages 472-479Publisher
TAYLOR & FRANCIS LTD
DOI: 10.1080/11263500802410819
Keywords
Dissipative processes; L; nobilis; leaf gas-exchange; Q; ilex; summer drought; winter cold
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Photosynthesis and photoprotective mechanisms were investigated in the field on Laurus nobilis L. and Quercus ilex L. leaves exposed to summer drought (July) and winter cold (February) conditions compared with no-stress conditions (May). In July, net photosynthetic rate (A) and stomatal conductance (gs) decreased significantly compared with May in both species; conversely the highest ETR/A ratio and no difference in non-photochemical quenching (NPQ) was observed. In February A, gs and ETR/A declined compared with May but the highest NPQ were found in both species. Our data suggest that during summer, an increase of photochemical alternative pathways to carbon reduction, were able to effectively protect the photosynthetic apparatus under drought. In winter, the thermal dissipation of excess absorbed light constitutes the main safety valve for the photosynthetic apparatus.
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