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Keywords:

  • sUV-B;
  • O3;
  • Linum usitatissimum L.;
  • yield;
  • seed quality;
  • fatty acids

Abstract

BACKGROUND: Current scenarios of global climate change predict a significant increase in ultraviolet B (UV-B) and tropospheric ozone (O3) in the near future. Both UV-B and O3 can have detrimental effects on the productivity and yield quality of important agricultural crops. The present study was conducted to investigate the individual and interactive effects of supplemental UV-B (sUV-B) (ambient + 7.2 kJ m−2 day−1) and O3 (ambient + 10 ppb) on the yield and oil quality of two cultivars of linseed (Linum usitatissimum L.).

RESULTS: The mean monthly ambient O3 concentration varied from 27.7 to 59.0 ppb during the experimental period. O3 affected fruit formation, while sUV-B was mainly responsible for ovule abortion. Seed sugar and protein contents showed maximum reduction in O3-treated plants, while mineral nutrient levels were most affected by sUV-B + O3 treatment. Rancid oil of low nutritional quality and containing long-chain fatty acids was favoured along with a decrease in oil content.

CONCLUSION: sUV-B and O3 individually as well as in combination caused deterioration of the yield and quality of oil and seeds of linseed. However, the individual effect of O3 was more damaging than the effect of sUV-B or sUV-B + O3, and cultivar T-397 performed better than Padmini. © 2012 Society of Chemical Industry