Abstract
The effect of pre-treatment with 200 mM NaCl on the response of four barley cultivars (Hordeum vulgare L. cv. Bülbül-89, Kalaycı-97, Tarm-92 and Tokak-157/37) to UV-B radiation was investigated. Salt stress as well as UV-B irradiation led to a decrease of the total chlorophyll (chl) content in all cultivars, except in Kalaycı-97. While carotenoids are almost not affected by NaCl treatment, UV-B irradiation caused an increase by 5–20% of carotenoid content of all cultivars. UV-B induced damages of photosynthetic apparatus were estimated by the rate of photosynthetic electron transport measured by chl fluorescence and the rate of oxygen evolution, the latter being more affected. Pre-treatment with NaCl alleviated harmful effect of UV-B irradiation on F v/F m and ETR, but not on oxygen evolution. UV-B-induced and UV-B-absorbing compounds with absorption at 300 and 438 nm increased as a result of UV-B treatment. The level of stress marker proline increased considerably as a result of NaCl treatment, while UV-B irradiation resulted in a pronounced increase of the level of H2O2. MDA enhanced in the seedlings subjected to salt and UV-B stress. Established cross-acclimation to UV-B as a result of salt treatment could be due to the increased free proline and the level of UV-B absorbing compounds in barley seedlings subjected to NaCl.



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Abbreviations
- Chl:
-
Chlorophyll
- ETR:
-
Electron transport rate
- Fo and Fm:
-
Initial and maximum fluorescence yield
- MDA:
-
Malondialdehyde
- PPFD:
-
Photosynthetic photon flux density
- PSII:
-
Photosystem II
- TBA:
-
Thiobarbituric acid
- TCA:
-
Trichloroacetic acid
- Tris:
-
Tris[hydroxymethyl]-aminomethane
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Acknowledgments
This research was supported by The Scientific and Technological Researched Council of Turkey, Project number, TBAG-U/135 and Bulgarian Academy of Sciences.
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Communicated by F. Corbineau.
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Çakırlar, H., Çiçek, N., Fedina, I. et al. NaCl induced cross-acclimation to UV-B radiation in four Barley (Hordeum vulgare L.) cultivars. Acta Physiol Plant 30, 561–567 (2008). https://doi.org/10.1007/s11738-008-0155-5
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DOI: https://doi.org/10.1007/s11738-008-0155-5