| Abstract: | Gould, R. P. and Mansfield, T. A. 1988. Effects of sulphur dioxideand nitrogen dioxide on growth and translocation in winter wheat.—J. exp. Bot 39: 389–99 Winter wheat (Triticum aestivum L. cv. Avalon) was grown undersimulated autumn conditions for 4 weeks and exposed to a mixtureof SO2 and NO2. Biomass was measured after 2, 3 and 4 weeksand the flag leaves of sample plants were labelled with 14CO2.Biomass yields revealed an increase in shoot-to-root ratiosunder polluted conditions. The labelling experiments showedthat less assimilate was transported to the roots, whilst morewas allocated to the younger components of the plant. It appearedthat NO2 and SO2 also caused labelled photosynthate to be retainedin the labelled leaf. Reducing the photon flux exacerbated theeffects of SO2 and NO2 as indicated by changes in biomass andby the distribution of 14C. Key words: Wheat, SO2, NO2, growth, translocation |
