Abstract
Gould, R. P. and Mansfield, T. A. 1988. Effects of sulphur dioxide and nitrogen dioxide on growth and translocation in winter wheat.—J. exp. Bot. 39: 389-99. Winter wheat (Triticum aestivum L. cv. Avalon) was grown under simulated autumn conditions for 4 weeks and exposed to a mixture of S02 and N02. Biomass was measured after 2, 3 and 4 weeks and the flag leaves of sample plants were labelled with 14C02. Biomass yields revealed an increase in shoot-to-root ratios under polluted conditions. The labelling experiments showed that less assimilate was transported to the roots, whilst more was allocated to the younger components of the plant. It appeared that N02 and S02 also caused labelled photosynthate to be retained in the labelled leaf. Reducing the photon flux exacerbated the effects of S02 and N02 as indicated by changes in biomass and by the distribution of 14C.
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