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J.A. Callow (Ed.)'s Advances in Botanical Research, Vol. 18 PDF

By J.A. Callow (Ed.)

ISBN-10: 0120059185

ISBN-13: 9780120059188

This quantity comprises 4 reports protecting topics of curiosity to a vast +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 harm as a result of tension 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 influence of plants on air circulation and the ensuing affects on microclimate, and description the latest 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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Brenninger and Tranquillini (1983), Hunt and Black (1988), Winner and Mooney (1980b) and several others, showed for a number of species (Table I), that inhibition of photosynthesis by acute SO2 exposures could at the most be partly explained by stomatal closure. Alscher et al. (1987) found that photosynthesis in pea recovered as usual when SO2 exposure was terminated, while leaf conductance did not. Furthermore, in one cultivar (“Progress”) photosynthesis declined during SO2 exposure, while leaf conductance did not.

However, they also found that the prolonged SOz exposure slowed the stomatal closing reaction to darkness, which increased the total transpiration on a daily basis. However, even quite high. concentrations (Biggs and Davis, 1982) (Table I) have sometimes been found to increase leaf conductance. Such an increase, though, was transient and only seen during intermittent exposures. PHOTOSYNTHESIS AND STOMATAL RESPONSES 31 Response mechanisms. Long-term SO2 exposures confirm what has already been described for short-term SO2 exposures, and point to only a few other mechanisms.

Response of diffusive resistance to short-term SO2 exposure Typical responses. g. , 1973; L'Hirondelle and Addison, 1985). , 1979b; Biggs and Davis, 1980; Winner and Mooney, 1980c; Takemoto and Noble, 1982; Natori and Totsuka, 1984a). However at 500600ppb h and with exposures of 2 h or longer, the stomata typically closed, whatever the reaction at lower doses, although there were a few exceptions to this rule (Majernik and Mansfield, 1971). The results obtained by Furukawa et al. (1979a) illustrate the large variability in the stomatal response to acute SO2 exposure (Fig.

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

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