tailieunhanh - The role of short-term high temperature pretreatment on the UV-B tolerance of barley cultivars
The impact of pretreatment with high temperature (45 °C for 45 min) on the UV-B tolerance of 4 barley cultivars (Hordeum vulgare L. ‘Bülbül-89’, ‘Kalaycı-97’, ‘Tarm-92’, and ‘Tokak-157/37’) was examined. In addition, although plants substantially accumulated the UV-B-absorbing compounds, the photosynthetic process might not be adequately protected from UV-B radiation. | N. ÇİÇEK, I. FEDINA, H. ÇAKIRLAR, M. VELITCHKOVA, K. GEORGIEVA Research Article Turk J Agric For 36 (2012) 153-165 © TÜBİTAK doi: The role of short-term high temperature pretreatment on the UV-B tolerance of barley cultivars Nuran ÇİÇEK1,*, Ivanka FEDINA2, Hüsnü ÇAKIRLAR1, Maya VELITCHKOVA3, Katya GEORGIEVA2 1 Department of Biology, Faculty of Science, Hacettepe University, 06800 Beytepe, Ankara - TURKEY 2 Institute of Plant Physiology and Genetics, Bulgarian Academy of Sciences, Sofia 1113 - BULGARIA 3 Institute of Biophysics and Biomedical Engineering, Bulgarian Academy of Sciences, Sofia 1113 - BULGARIA Received: Abstract: The impact of pretreatment with high temperature (45 °C for 45 min) on the UV-B tolerance of 4 barley cultivars (Hordeum vulgare L. ‘Bülbül-89’, ‘Kalaycı-97’, ‘Tarm-92’, and ‘Tokak-157/37’) was examined. The response of the plants to treatment was evaluated by measuring the pigment content, chlorophyll a fluorescence, oxygen evolution, fraction of oxygen-evolving complex, proline content, UV-B-absorbing compounds (A535 and A300), and stress markers (malondialdehyde, H2O2, and UV-B marker). Regardless of high temperature pretreatment, UV-B irradiation decreased the photosynthetic pigment content, photosystem II activity, oxygen evolution, and the fraction of oxygenevolving complex in almost all of the barley cultivars. UV-B treatment significantly increased the proline content, UV-B-absorbing compounds, and stress markers. According to the findings, it can be deduced that short-term high temperature pretreatment might not provide a cross-tolerance to UV-B irradiation in the 4 barley cultivars studied; in fact, such exposure was found to aggravate the responses. In addition, although plants substantially accumulated the UV-B-absorbing compounds, the photosynthetic process might not be adequately protected from UV-B radiation. Key words: Chlorophyll fluorescence, high temperature, Hordeum vulgare, pigment,
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