Effect of low and high temperatures on the photosynthetic performance of Lantana camara L. Leaves in darkness

Effect of low and high temperatures on the photosynthetic performance of Lantana camara L. Leaves... Low and high temperatures are known as most important factors influencing plant performance and distribution. Plants of Lantana camara L. coming from two distinct geographical populations (Iberian Peninsula and Galápagos Islands) were cultivated in a common garden experiment, and their leaves were subjected to thermal treatments (from +20.0 to −7.5°C during the winter and from +20.0 to +50.0°C during the summer) in a programmable water bath in darkness. Their photosynthetic performance and their recovery capacity after the thermal treatment were evaluated by measuring chlorophyll fluorescence, net photosynthesis rate, and leaf necrosis. In general, L. camara photosynthetic apparatus showed a wide range of temperature tolerance in darkness, showing optimal functioning of its photosystem II just after exposure to temperatures between −2.5 and +35.0°C for the Iberian population and between +10.0 and +25.0°C for the Galápagos population. Just after exposure to low and high temperatures, gradual cold and heat-induced photoinhibition was recorded for both populations. After 24 h, leaves of L. camara demonstrated a great recovery capacity from −2.5 to +42.5°C. However, leaves of the treatments from −5.0°C down and +47.50°C up showed permanent damages to the photosynthetic apparatus and to the leaf tissues. Slight interpopulation differences were found only at extreme temperatures. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Russian Journal of Plant Physiology Springer Journals

Effect of low and high temperatures on the photosynthetic performance of Lantana camara L. Leaves in darkness

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SP MAIK Nauka/Interperiodica
Copyright © 2013 by Pleiades Publishing, Ltd.
Life Sciences; Plant Physiology; Plant Sciences
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