Effect of solar irradiation on carnivorous plant Drosera rotundifolia L.

Doboš, Marko (2012) Effect of solar irradiation on carnivorous plant Drosera rotundifolia L.. Diploma thesis, Faculty of Science > Department of Biology.

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Abstract

Roundleaf sundew (Drosera rotundifolia L.) is a carnivorous plant of sun exposed habitats that is threatened by overgrowth. After removing tall plants from habitat sundews would be instantly exposed to high light intensity levels again. Purpose of this experiment was to examine differences betwen plants that are growing in low light intensity and the ones that are growing exposed to natural solar irradiation and whether and how plants that grew in low light intensity would adapt to a solar irradiation exposure. Plants that were exposed to outer atmospheric conditios during one year were larger and also produced flower stalks. They had lower concentration of all photosynthetic pigments, but without changes in efficiency of photosystem II which indicates adaptation of photosynthetic apparatus. Also, higher concentration of phenols was found – tannins, phenolic acids, anthocyanins and flavonoids that could contribute in protection from high light intensities, UV stress, but also oxidative stress. Plants that were suddenly exposed to direct solar irradiation five hours a day during one week in summer, after initial stress that led to photoinhibition, adapted after seven days of exposure and developed protection from light and UV stress by increasing concentration of phenols, particularly tannins and flavonoids, especially anthocyanins. Exposure also led to a change in photosynthetic pigments ratio because chlorophylls decreased, and carotenoids increased, which together with synthesis of protective compounds led to adaptation of photosynthetic apparatus and recovery of photosynthesis.

Item Type: Thesis (Diploma thesis)
Keywords: Drosera rotundifolia L, roundleaf sundew , solar irradiation, light stress , photosynthetic pigments, phenolic compounds
Supervisor: Tkalec, Mirta
Date: 2012
Number of Pages: 47
Subjects: NATURAL SCIENCES > Biology
Divisions: Faculty of Science > Department of Biology
Depositing User: Grozdana Sirotic
Date Deposited: 04 Mar 2014 14:01
Last Modified: 19 Sep 2014 09:46
URI: http://digre.pmf.unizg.hr/id/eprint/526

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