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By J.A. Callow (Ed.)

ISBN-10: 0120059185

ISBN-13: 9780120059188

This quantity includes 4 experiences overlaying matters of curiosity to a vast +ange of botanists. Saxe examines the impression 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 offers and evaluate of the shipping and metabolism of carbon and nitrogen in legume nodules, and van Gardingen and beauty speak about the interplay of vegetation with wind, together with the impression of crops on air move and the ensuing impacts on microclimate, and description the latest advances in study 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 means of Vogelman and his colleagues.

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Influence of the environment. Barton et al. (1980) found the stornatal reaction in Phaseolus to acute SO2 exposures to depend on the relative humidity as indicated in Table I. Bonte and Louget (1975) found Pelargonium plants to be more injured in humid air, since this slowed the stornatal closing response to S02. Rist and Davis (1979) found stornatal conductance to be relatively more inhibited at 21°C than at 32"C, and relatively more inhibited at 80% R H than at 60% RH. However, the absolute stornatal conductance was greater at both the high humidity and the high temperature, both with or without SO*.

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.

However, the pea took up considerably more SO2 than the corn, partly because of a lower leaf diffusion 32 H. SAXE resistance in the pea. Though a higher stomatal SO2 uptake was usually associated with higher sensitivity to injury, Koziol et al. (1986) reported that the resistant one of the two cultivars of perennial ryegrass had a lower stomatal resistance when exposed to 50ppb S02. At 0 and 150ppb S02, however, the resistant cultivar had a 10% and22% higher stomatal resistance than the senstive cultivar.

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

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