By J.A. Callow (Ed.)

This quantity includes 4 studies masking matters of curiosity to a wide +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 attributable to tension and pollution. Streeter offers and evaluation of the shipping and metabolism of carbon and nitrogen in legume nodules, and van Gardingen and charm speak about the interplay of vegetation with wind, together with the influence of plants on air circulate and the ensuing affects on microclimate, and description the newest advances in examine in to the physiological responses to wind. the development of fibre optic microprobes and their functions in measuring the sunshine microenvironment inside of plant tissues are thought of through Vogelman and his colleagues.

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Advances in Botanical Research, Vol. 18

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On average (of all pot plants), neither gas had any significant effect on transpiration during the 4-day exposure (Table 11). Stomata1 NO, uptake. Saxe (1986b) found NO2 uptake in eight pot plant species or cultivars to correlate with transpiration, while total NO uptake showed no significant dependence on stomata1 opening. Nitrogen oxide was taken up at a constant rate throughout the light period, while the uptake of NO2 decreased towards the end of the day in the same manner as transpiration.

The inhibition of photosynthesis at low light could be explained by a low “detoxification” rate, while the inhibition at high light levels could happen if light stimulation of the “detoxification processes” had less effect than the increased SO2 uptake caused by the light induced stornatal opening. 30 H. SAXE Jones and Mansfield (1982) found the growth of Timothy grass to be more inhibited by SO2 at high light levels and high temperature, and suggested that plants with a high growth rate are generally more sensitive to SO;!.

1987) also measured changes in sulphite accumulation, reduced glutathione, 1,6-bisphosphatase, glyceraldehyde-3-phosphate dehydrogenase, and electron transport in isolated thylakoids. /sulphitethan was the inactivation of various light modulated enzyme reactions (Alscher, 1984). One likely candidate for this site would be ribulose-l,5-bis-phosphate-carboxylase (RuBPC), and another would be the transport of intermediates across the chloroplast envelope. , 1975). Alscher et al. (1987) also concluded that the H 2 0 2 scavenging system is a plausible candidate for determining photosynthetic sensitivity to SO;?.

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