OXIDATIVE STRESS
Tropospheric ozone pollution reduces the yield of African crops
Felicity Hayes,
Katrina Sharps, Harry Harmens, Ieuan Roberts, Gina Mills,
Corresponding Author
Felicity Hayes
Centre for Ecology & Hydrology, Bangor, UK
Correspondence
Felicity Hayes, Centre for Ecology & Hydrology, Environment Centre Wales, Deiniol Road, Bangor, Gwynedd, LL57 2UW, UK.
Email: fhay@ceh.ac.uk
Search for more papers by this authorFelicity Hayes,
Katrina Sharps, Harry Harmens, Ieuan Roberts, Gina Mills,
Corresponding Author
Felicity Hayes
Centre for Ecology & Hydrology, Bangor, UK
Correspondence
Felicity Hayes, Centre for Ecology & Hydrology, Environment Centre Wales, Deiniol Road, Bangor, Gwynedd, LL57 2UW, UK.
Email: fhay@ceh.ac.uk
Search for more papers by this authorFunding information
This work was carried out as part of the Centre for Ecology & Hydrology Long-Term Science—Official Development Assistance “SUNRISE” project, NEC06476.
Abstract
Northern, Southern and Equatorial Africa have been identified as among the regions most at risk from very high ozone concentrations. Whereas we know that many crop cultivars from Europe, north America and Asia are sensitive to ozone, almost nothing is known about the sensitivity of staple food crops in Africa to the pollutant. In this study cultivars of the African staple food crops, Triticum aestivum (wheat), Eleusine coracana (finger millet), Pennisetum glaucum (pearl millet) and Phaseolus vulgaris (bean) were exposed to an episodic ozone regime in solardomes in order to assess whether African crops are sensitive to ozone pollution. Extensive visible leaf injury due to ozone was shown for many cultivars, indicating high sensitivity to ozone. Reductions in total yield and 1,000-grain weight were found for T. aestivum and P. vulgaris, whereas there was no effect on yield for E. coracana and P. glaucum. There were differences in sensitivity to ozone for different cultivars of an individual crop, indicating that there could be possibilities for either cultivar selection or selective crop breeding to reduce sensitivity of these crops to ozone.
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