Abstract
The differences in some morphological and physiological characteristics of sun- and shade-adapted Haberlea rhodopensis plants were compared. Changes in the photosynthetic activity, electrolyte leakage from leaf tissues, malondialdehyde content (MDA) and leaf anatomy were studied at different degrees of desiccation as well as after rehydration of plants. The MDA content in well-watered sun Haberlea plants was higher compared to shade plants suggesting higher lipid peroxidation, which is commonly regarded as an indicator of oxidative stress, but desiccation of plants at high light did not cause additional oxidative damage as judged by the unaffected MDA content. The electrolyte leakage from dried leaves (8% RWC) from both shade and sun plants increased fourfold indicating similar membrane damage. However, the recovery after rehydration showed that this damage was reversible. Well-watered sun plants had higher photosynthetic activity probably due to the larger thickness of the mesophyll layer in such plants. On the other hand, desiccation at high light reduced CO2 assimilation which was in accordance with the stronger reduction of stomatal conductance. Stomata were visible only on the abaxial side of sun leaves having also higher abundance of non-glandular trichomes. Increased trichomes density and epicuticular waxes and filaments upon desiccation could help plants to increase reflection, reduce net radiation income, slow down the rate of water loss and survive adverse conditions.
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This work was supported by the National Science Fund under research project DO02-208/2008.
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Georgieva, K., Doncheva, S., Mihailova, G. et al. Response of sun- and shade-adapted plants of Haberlea rhodopensis to desiccation. Plant Growth Regul 67, 121–132 (2012). https://doi.org/10.1007/s10725-012-9669-3
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DOI: https://doi.org/10.1007/s10725-012-9669-3