Abstract
The effect of a wide range of temperatures (−15 and 60°C) in darkness or under strong irradiation [1,600 μmol(photon) m−2 s−1] on quantum yield of photosystem II photochemistry and xanthophyll cycle pigments was investigated in a tropical fruit crop (Musa sp.) and a temperate spring flowering plant (Allium ursinum L.). In darkness within the nonlethal thermal window of A. ursinum (from −6.7 to 47.7°C; 54.5 K) and of Musa sp. (from −2.2°C to 49.5°C; 51.7 K) maximal quantum yield of PSII photochemistry (Fv/Fm) was fairly unaffected by temperature over more than 40 K. At low temperature Fv/Fm started to drop with ice nucleation but significantly only with initial frost injuries (temperature at 10% frost damage; LT10). The critical high temperature threshold for PSII (Tc) was 43.8°C in A. ursinum and 44.7°C in Musa sp. Under strong irradiation, exposure to temperatures exceeding the growth ones but being still nonlethal caused photoinhibition in both species. Severity of photoinhibition increased with increasing distance to the growth temperature range. ΔF/Fm′ revealed distinctly different optimum temperature ranges: 27–36°C for Musa sp. and 18–27°C for A. ursinum exceeding maximum growth temperature by 2–7 K. In both species only at temperatures > 30°C zeaxanthin increased and violaxanthin decreased significantly. At nonlethal low temperature relative amounts of xanthophylls remained unchanged. At temperatures > 40°C β-carotene increased significantly in both species. In Musa sp. lutein and neoxanthin were significantly increased at 45°C, in A. ursinum lutein remained unchanged, neoxanthin levels decreased in the supraoptimal temperature range. In darkness, Fv/Fm was highly temperature-insensitive in both species. Under strong irradiation, whenever growth temperature was exceeded, photoinhibition occurred with xanthophylls being changed only under supraoptimal temperature conditions as an antiradical defence mechanism.
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Abbreviations
- Chla(b):
-
chlorophyll a(b)
- F0 :
-
minimal fluorescence in the dark-adapted state
- F0/T:
-
temperature-dependent change in minimal fluorescence
- Fm :
-
maximal fluorescence in the dark-adapted state
- Fm′:
-
maximal fluorescence in the light-adapted state
- Fs :
-
steady state fluorescence
- Fv:
-
variable fluorescence
- Fv/Fm :
-
maximal quantum yield of PSII photochemistry
- ΔF/Fm′:
-
effective quantum yield of PSII photochemistry
- LT10 (LT50):
-
temperature at 10% (50%) heat or frost damage, respectively
- PPFD:
-
photosynthetic photon flux density
- PSII:
-
photosystem II
- ROS:
-
reactive oxygen species
- Tc :
-
critical high temperature threshold of the F0/T curve calculated as the intersection of a horizontal line at the level of F0 at 20°C and of a line fitted visually to the fast rising phase
- Tp :
-
peak temperature of the F0/T curve
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Acknowledgements: We are thankful to Dr. D. Remias for useful advice concerning the HPLC analyses and S. Aigner for expert technical assistance in HPLC work. We would like to acknowledge the Botanical Garden of the University of Innsbruck for cultivation of plant material. In addition, we are grateful to all reviewers for their valuable comments.
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Dongsansuk, A., Lütz, C. & Neuner, G. Effects of temperature and irradiance on quantum yield of PSII photochemistry and xanthophyll cycle in a tropical and a temperate species. Photosynthetica 51, 13–21 (2013). https://doi.org/10.1007/s11099-012-0070-2
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DOI: https://doi.org/10.1007/s11099-012-0070-2