NaCl induced cross-acclimation to UV-B radiation in four Barley (<Emphasis Type="Italic">Hordeum vulgare</Emphasis> L.) cultivars |
| |
Authors: | Hüsnü Çak?rlar Nuran Çiçek Ivanka Fedina Katya Georgieva Ali Do?ru Maya Velitchkova |
| |
Institution: | (1) Department of Biology, Faculty of Science, Hacettepe University, 06800 Beytepe, Ankara, Turkey;(2) Academic Metodi Popov Institute of Plant Physiology, Bulgarian Academy of Sciences, Academic Georgi Bonchev Street, Building 21, Sofia, 1113, Bulgaria;(3) Department of Biology, Faculty of Art and Sciences, Sakarya University, Esentepe Campus, 54187 Sakarya, Turkey;(4) Institute of Biophysics, Bulgarian Academy of Sciences, Academic Georgi Bonchev Street, Building 21, Sofia, 1113, Bulgaria |
| |
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. |
| |
Keywords: | Barley Chlorophyll fluorescence NaCl Oxygen evolution UV-B inducing compounds |
本文献已被 SpringerLink 等数据库收录! |
|