Abstract
The relation between oxygen evolution rate (OER) and quantum yield of photochemical reactions in photosystem 2 (ΦPS2) 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 ΦPS2 in control cell suspension within irradiance range of 0 – 500 μmol m−2 s−1. Under osmotic stress, OER and ΦPS2 were significantly reduced. Relation between OER and ΦPS2 was curvilinear due to strong osmotically-induced inhibition of OER at high irradiance. The highest used irradiance (500 μmol 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 F0/FM. These changes indicated negative effects of osmoticum on structure and function of photosynthetic apparatus.
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Abbreviations
- Chl:
-
chlorophyll
- LHC 2:
-
light harvesting complex of PS 2
- NPQ:
-
non-photochemical quenching
- OER:
-
oxygen evolution rate
- PN :
-
net photosynthetic rate
- PPFD:
-
photosynthetic photon flux density
- PS 2:
-
photosystem 2
- qE :
-
energy-dependent quenching
- ΦCO2 :
-
quantum yield of photosynthetic CO2 fixation
- ΦPS2 :
-
quantum yield of photochemical processes in PS 2
- ψ:
-
water potential
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Vaczi, P., Bartak, M. Photosynthesis of lichen symbiotic alga Trebouxia erici as affected by irradiance and osmotic stress. Biol Plant 50, 257–264 (2006). https://doi.org/10.1007/s10535-006-0016-2
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DOI: https://doi.org/10.1007/s10535-006-0016-2