New PDF release: Advances in Botanical Research, Vol. 18

By J.A. Callow (Ed.)

ISBN-10: 0120059185

ISBN-13: 9780120059188

This quantity comprises 4 stories protecting topics of curiosity to a large +ange of botanists. Saxe examines the impact of polluted air on photosynthesis and stomatal functionality, and using physiological and biochemical responses for early detection of damage attributable to pressure and pollution. Streeter presents and evaluation of the delivery and metabolism of carbon and nitrogen in legume nodules, and van Gardingen and charm talk about the interplay of crops with wind, together with the impact of plants on air circulation and the ensuing affects on microclimate, and description the newest advances in learn in to the physiological responses to wind. the development of fibre optic microprobes and their purposes in measuring the sunshine microenvironment inside plant tissues are thought of by means of Vogelman and his colleagues.

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Additional info for Advances in Botanical Research, Vol. 18

Example text

E. the electron transport and photophosphorylation). Atkinson and Winner (1987) and Mooney et al. (1988) concluded the same, since a reduction in photosynthesis activity of fumigated relative to non-fumigated radish plants was not associated with differences in quantum yields. The principal effect of SO2 was on the leaf carboxylating capacity. The transient nature of the 25% photosynthesis depression reported for radish by Atkinson and Winner (1987) was interpreted as a reduced RuBPC activity rather than a change in amount, since the turnover rate of leaf enzymes was known to be about 10% per day.

In addition, Tschanz et al. (1986) found that SO2 could even exert a negative feedback on its own detoxification through the release of reduced sulphur compounds, as SO2 inhibited adenosine 5’-phosphosulphate sulphotransferase in spruce trees. 3. Respiration response to long-term SO2 exposure The absolute inhibition of dark respiration reported by Saxe (1983) clearly followed the reduction of leaf area caused by scorching, beginning after 2 weeks of exposure. Relative to viable leaf area he observed no changes in dark respiration.

1. Photosynthesis response to long-term SO2 exposure Typical responses. Except for the lowest SO;! doses, photosynthesis typically declined gradually from day to day (with a fast decline the first few hours (Saxe, 1983)), with no visible leaf necrosis, and complete reversibility at the lower concentrations and durations (Hallgren and Gezelius, 1982; Rao et a f . , 1983; Saxe, 1983). Visible injury and obvious irreversibility occurred with the higher external SO2 doses. But even after visible injury had occurred, one component of the photosynthesis inhibition was stiff reversible (Fig.

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Advances in Botanical Research, Vol. 18 by J.A. Callow (Ed.)


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