NaCl induced cross-acclimation to UV-B radiation in four Barley (Hordeum vulgare L.) cultivars

CARKIRLAR H., ÇİÇEK N., FEDINA I., GEORGIEVA K., Dogru A., VELITCHKOVA M.

ACTA PHYSIOLOGIAE PLANTARUM, vol.30, no.4, pp.561-567, 2008 (SCI-Expanded) identifier identifier

  • Publication Type: Article / Article
  • Volume: 30 Issue: 4
  • Publication Date: 2008
  • Doi Number: 10.1007/s11738-008-0155-5
  • Journal Name: ACTA PHYSIOLOGIAE PLANTARUM
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Page Numbers: pp.561-567
  • Keywords: barley, chlorophyll fluorescence, NaCl, oxygen evolution, UV-B inducing compounds, ULTRAVIOLET-B, INTRASPECIFIC VARIATION, PISUM-SATIVUM, SENSITIVITY, LEAVES, ACCUMULATION, GROWTH, ARABIDOPSIS, SEEDLINGS, EXPOSURE
  • Hacettepe University Affiliated: Yes

Abstract

The effect of pre-treatment with 200 mM NaCl on the response of four barley cultivars (Hordeum vulgare L. cv. Bulbul-89, Kalayc1-97, 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 Kalayc1-97. 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.