Response of sun- and shade-adapted plants of Haberlea rhodopensis to desiccation |
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Authors: | Katya Georgieva Snejana Doncheva Gergana Mihailova Snejana Petkova |
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Institution: | (1) Institute of Plant Physiology and Genetics, Bulgarian Academy of Sciences, Acad. G. Bonchev Str., Bl. 21, 1113 Sofia, Bulgaria |
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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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