The role of short-term high temperature pretreatment on the UV-B tolerance of barley cultivars

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ÇİÇEK N., FEDINA I., CAKIRLAR H., VELITCHKOVA M., GEORGIEVA K.

TURKISH JOURNAL OF AGRICULTURE AND FORESTRY, vol.36, no.2, pp.153-165, 2012 (SCI-Expanded) identifier identifier

  • Publication Type: Article / Article
  • Volume: 36 Issue: 2
  • Publication Date: 2012
  • Doi Number: 10.3906/tar-1102-15
  • Journal Name: TURKISH JOURNAL OF AGRICULTURE AND FORESTRY
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus, TR DİZİN (ULAKBİM)
  • Page Numbers: pp.153-165
  • Keywords: Chlorophyll fluorescence, high temperature, Hordeum vulgare, pigment, photosynthesis, UV-B, COWPEA VIGNA-UNGUICULATA, PHOTOSYSTEM-II, OXIDATIVE STRESS, PHOTOSYNTHETIC PIGMENTS, ULTRAVIOLET-RADIATION, DEFENSE SYSTEM, L. WALP., RESPONSES, ANTIOXIDANT, SENSITIVITY
  • Hacettepe University Affiliated: Yes

Abstract

The impact of pretreatment with high temperature (45 degrees C for 45 min) on the UV-B tolerance of 4 barley cultivars (Hordeum vulgare L. 'Bulbul-89', 'Kalayci-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 (A(535) and A(300)), 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 oxygen-evolving 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.