By J.A. Callow (Ed.)
This quantity comprises 4 stories masking matters of curiosity to a vast +ange of botanists. Saxe examines the influence of polluted air on photosynthesis and stomatal functionality, and using physiological and biochemical responses for early detection of damage brought on by rigidity and pollution. Streeter presents and assessment of the delivery and metabolism of carbon and nitrogen in legume nodules, and van Gardingen and style talk about the interplay of crops with wind, together with the impact of plants on air flow and the ensuing impacts 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 of plant tissues are thought of by way of Vogelman and his colleagues.
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Extra info for Advances in Botanical Research, Vol. 18
60 0 w) 20 30 400 10 DAYS (AFTER M 50 40 SEED HYDRATIOW) Fig. 4. 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.
Hallgren and Gezelius (1982) found that the inhibition of the photosynthesis of pine tree seedlings in climate chambers by 75-150ppb SO2 for 5 days depended on light; only at absorbed quantum flux densities above ca. 60 pmol m-* s-l did 75 ppb SO2 inhibit photosynthesis. Hallgren and Gezelius (1982) also exposed branches of pine trees in the field (using a small plexiglass cuvette), and found a similar inhibition and dependence on light. It was not clear, however, to what extent the inhibition of photosynthesis in the field was influenced by a chamber effect.
SAXE gas reaches really high concentrations; otherwise, we should not consider the gas to be toxic to the plants. The response to NO + NO2 was usually found to be simple additive (Hill and Bennett, 1970), at least at the lower concentrations (Capron and Mansfield, 1976). Saxe and Murali (1989b) indicated that pre-exposure to high concentrations of NO or NO2 increased the photosynthesis response to the other gas. The response of Picea abies (Saxe and Murali, 1989b) was much less sensitive than the response of pot plants (Saxe, 1986a) to both NO and NO2.
Advances in Botanical Research, Vol. 18 by J.A. Callow (Ed.)