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@article{604666, author = {Váczi, Peter and Barták, Miloš}, article_number = {2}, keywords = {chlorophyll fluorescence; oxygen evolution; photobiont; photosynthesis; quantum yield}, language = {eng}, issn = {0006-3134}, journal = {Biologia Plantarum}, title = {Photosynthesis of lichen symbiotic alga Trebouxia erici as affected by irradiance and osmotic stress}, url = {http://dx.doi.org/10.1007/s10535-006-0016-2}, volume = {50}, year = {2006} }
TY - JOUR ID - 604666 AU - Váczi, Peter - Barták, Miloš PY - 2006 TI - Photosynthesis of lichen symbiotic alga Trebouxia erici as affected by irradiance and osmotic stress JF - Biologia Plantarum VL - 50 IS - 2 SP - 257-264 EP - 257-264 SN - 00063134 KW - chlorophyll fluorescence KW - oxygen evolution KW - photobiont KW - photosynthesis KW - quantum yield UR - http://dx.doi.org/10.1007/s10535-006-0016-2 N2 - The relation between oxygen evolution rate (OER) and quantum yield of photochemical reactions in photosystem 2 ("Fi"PS2) was examined in lichen symbiotic alga Trebouxia erici Ahmadjian (strain UTEX 911) exposed to different irradiances and osmotic stress (2 M sucrose for 60 h). Linear relationship was found between OER and "Fi"PS2 in control cell suspension within irradiance range of - 0 500 umol m-2 s-1. Under osmotic stress, OER and "Fi"PS2 were significantly reduced. Relation between OER and "Fi"PS2 was curvilinear due to strong osmotically-induced inhibition of OER at high irradiance. The highest used irradiance (500 umol m-2 s-1) was photoinhibitory for osmotically-stressed T. erici because non-photochemical quenching (NPQ) increased substantially. Energy-dependent quenching represented major part of NPQ increase. Osmotic stress led also to the reduction of capacity of photochemical processes in PS 2 (Fv/Fm) and increase in Fo/Fm. These changes indicated negative effects of osmoticum on structure and function of photosynthetic apparatus. ER -
VÁCZI, Peter and Miloš BARTÁK. Photosynthesis of lichen symbiotic alga Trebouxia erici as affected by irradiance and osmotic stress. \textit{Biologia Plantarum}. 2006, vol.~50, No~2, p.~257-264. ISSN~0006-3134.
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