By J.A. Callow (Ed.)
This quantity includes 4 stories overlaying 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 harm as a result of tension and pollution. Streeter offers and review of the shipping 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 impression of crops on air move 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 plant tissues are thought of by means of Vogelman and his colleagues.
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Extra info for Advances in Botanical Research, Vol. 18
Kaji et al. (1980) reported that 99% of absorbed NO2 nitrogen after 20 min exposure of sunflower leaves to 6 ppm NO2 had been transformed into reduced, organic nitrogen compounds with only 1 % remaining as nitrate and nitrite in the daytime, while at night 85-89% was reduced to organic forms and the rest was nitrate and nitrite. NO2 was incorporated into the plant via nitrate, nitrite and the glutamine and glutamate synthase system. 3. Respiration response to short-term NO, exposure Srivastava et al.
Biscoe et al. (1973) found short-term exposure of Viciafaba to 22-540 ppb SO2 to open stomata and, although stomatal resistance generally increased with leaf age, the opening response to SO2was larger and more rapid in the older leaves. A brief review of the response of diffusive resistance to SO2 (and 0 3 was ) recently given by Winner et al. (1988). Response mechanisms. Short-term exposures to SO2 may cause stomata to close (or open) both in response to direct effects on their function, and indirectly in response to the described inhibiting or stimulating effects of SO2 on photosynthesis (Fig.
In any case the increased stomatal opening meant increased uptake of pollutants. Though not mentioned by Preston (1988), NO, must also have been present in the emissions from the designated oil refinery. As a result of the pollution, the abundance of perennial shrub species was significantly lower and the abundance of annuals greater on the most polluted sites relative to the sites farthest away from the SO2 (and NO,) source. The influx of annuals and the decrease in the perennial cover resulted in greater species richness and a reduced shrub dominance similar to that observed in early post-fire sage scrub stands in California.
Advances in Botanical Research, Vol. 18 by J.A. Callow (Ed.)