Exceptional Photosynthetic Performance of Capparis spinosa L. Under Adverse Conditions of Mediterranean summer

Institute of Experimental Botany - Tập 42 - Trang 229-235 - 2004
E. Levizou1, P. Drilias1, A. Kyparissis2
1Laboratory of Plant Physiology, Department of Biology, University of Patras, 265 00, Patras, Greece
2Laboratory of Botany, Department of Biological Applications and Technology, University of Ioannina, 451 10, Ioannina, Greece, e-mail

Tóm tắt

Diurnal and seasonal fluctuations in water potential (Ψ), stomatal conductance (g s), transpiration rate (E), and net photosynthetic rate (P N) were monitored in Capparis spinosa L., a Mediterranean plant growing during summer, i.e. at the period considered the most stressful for local plant life. In spite of the complete absence of rain, Ψ exhibited a modest drop at midday (−2.7 MPa), but was fully recovered overnight, indicating sufficient access to water sources. The stomata remained open throughout the day and season and the high E resulted in leaf temperatures up to 3.9 °C below air temperature. Additionally, P N of the fully exposed leaves was higher than 25 μmol m−2 s−1 for more than 10 h per day throughout the summer growth period. No symptoms of photooxidative stress were shown, as judged by maximum photosystem 2 photochemical efficiency (Fv/Fm) and the function of xanthophyll cycle. Indeed, diurnal inter-conversions of the xanthophyll cycle components were modest during the summer and a more intensive function of the cycle was only evident during leaf senescence in autumn. In comparison with a semi-deciduous and an evergreen sclerophyll co-existing in the same ecosystem, C. spinosa assimilated up to 3.4 times more CO2 per m2 during its growth period (May to October) and up to 1.8 times more on an annual basis.

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Institute of Experimental Botany

Tập 42

229-235

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