Acclimation of Two Distinct Plant Species,Spring Barley and Norway Spruce,to Combined Effect of Various Irradiance and CO2 Concentration During Cultivation in Controlled Environment |
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Authors: | Kurasová I. Kalina J. Urban O. Štroch M. Špunda V. |
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Affiliation: | I. Kurasová, J. Kalina, O. Urban, M. troch and V. punda |
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Abstract: | The short-term acclimation (10-d) of Norway spruce [Picea abies (L.) Karst] to elevated CO2 concentration (EC) in combination with low irradiance (100 mol m–2 s–1) resulted in stimulation of CO2 assimilation (by 61 %), increased total chlorophyll (Chl) content (by 17 %), significantly higher photosystem 2 (PS2) photochemical efficiency (Fv/Fm; by 4 %), and reduced demand on non-radiative dissipation of absorbed excitation energy corresponding with enhanced capacity of photon utilisation within PS2. On the other hand, at high cultivation irradiance (1 200 mol m–2 s–1) both Norway spruce and spring barley (Hordeum vulgare L. cv. Akcent) responded to EC by reduced photosynthetic capacity and prolonged inhibition of Fv/Fm accompanied with enhanced non-radiative dissipation of absorbed photon energy. Norway spruce needles revealed the expressive retention of zeaxanthin and antheraxanthin (Z+A) in darkness and higher violaxanthin (V) convertibility (yielding even 95 %) under all cultivation regimes in comparison with barley plants. In addition, the non-photochemical quenching of minimum Chl a fluorescence (SV0), expressing the extent of non-radiative dissipation of absorbed photon energy within light-harvesting complexes (LHCs), linearly correlated with V conversion to Z+A very well in spruce, but not in barley plants. Finally, a key role of the Z+A-mediated non-radiative dissipation within LHCs in acclimation of spruce photosynthetic apparatus to high irradiance alone and in combination with EC was documented by extremely high SV0 values, fast induction of non-radiative dissipation of absorbed photon energy, and its stability in darkness. |
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Keywords: | /content/tu7n781283jg200h/xxlarge946.gif" alt=" beta" align=" MIDDLE" BORDER=" 0" >-carotene carotenoids chlorophylls Hordeum vulgare non-radiative dissipation photosynthesis Picea abies xanthophyll cycle |
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