Journal
PHOTOSYNTHETICA
Volume 49, Issue 3, Pages 389-396Publisher
ACAD SCIENCES CZECH REPUBLIC, INST EXPERIMENTAL BOTANY
DOI: 10.1007/s11099-011-0047-6
Keywords
abscisic acid; antioxidants; gas exchange; ozone; salinity; Triticum aestivum L.
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Funding
- State Key Laboratory of Soil Erosion and Dryland Farming on the Loess Plateau [10501-263]
- State Key Laboratory of Crop Biology at Shandong Agricultural University of China [2010KF08]
- National Science Foundations of China [30900200, 30900876, 31170367]
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A sand-culture experiment was conducted in open-top chambers which were constructed in a greenhouse to investigate the responses of salt-stressed wheat (Triticum aestivum L.) to O-3. Plant seeding of JN17 (a popular winter wheat cultivar) was grown in saltless (-S) and saline (+S, 100 mM NaCl) conditions combined with charcoal-filtered air (CF, < 5 ppb O-3) and elevated O-3 (+O-3, 80 +/- 5 ppb, 8 h day(-1)) for 30 d. O-3 significantly reduced net photosynthetic rate (P-N), stomatal conductance, chlorophyll contents and plant biomass in -S treatment, but no considerable differences were noted in those parameters between +O-3+S and CF+S treatments. O-3-induced loss in cellular membrane integrity was significant in -S plants, but not in +S plants evidenced by significant elevations being measured in electrolyte leakage (EL) and malondialdehyde (MDA) content in -S plants, but not in +S plants. Both O-3 and salinity increased proline content and stimulated antioxidant enzymes activities. Soluble protein increased by salinity but decreased by O-3. Abscisic acid (ABA) was significantly elevated by O-3 in -S plants but not in +S plants. The results of this study suggested that the specificity of different agricultural environments should be considered in order to develop reliable prediction models on O-3 damage to wheat plants.
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