Interspecific variations of photochemical properties in a xerotherm grassland community
In this work the role of xanthophyll cycle an d its relation to the photosynthetic activity in the dominant species of a semiarid sandy grassland community (Potentillo-Festucetum pseudovinae) were studied during the stressful summer period . The total amount of xanthophyll cycle pigments (violaxanth...
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| Dokumentumtípus: | Cikk |
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2002
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| Sorozat: | Acta biologica Szegediensis
46 No. 3-4 |
| Kulcsszavak: | Természettudomány, Biológia |
| Online Access: | http://acta.bibl.u-szeged.hu/22573 |
| Tartalmi kivonat: | In this work the role of xanthophyll cycle an d its relation to the photosynthetic activity in the dominant species of a semiarid sandy grassland community (Potentillo-Festucetum pseudovinae) were studied during the stressful summer period . The total amount of xanthophyll cycle pigments (violaxanthin, anteraxanthin, zeaxanthin) related to total chlorophyll content (VAZ pool) showed considerable interspecific alterations and it was 2-3 times larger in the summer period than in spring. The changes in the xanthophyll cycle , the potential (FyFm) and actual photochemical efficiency (AF/Fm) of PSII, as well as, the results of parallel measurements on their daily dynamics show that zeaxanthin has a major role in the photoinhibition in the photosynthetic apparatus during the summer stress on sandy grassland species. In July, the decrease s of F/F m was accompanied with increases of NPQ at the 100-120% extentt depending on the species. |
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| Terjedelem/Fizikai jellemzők: | 237-238 |
| ISSN: | 1588-385X |