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

By J.A. Callow (Ed.)

This quantity comprises 4 stories overlaying matters of curiosity to a extensive +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 as a result of pressure and pollution. Streeter presents and assessment of the delivery and metabolism of carbon and nitrogen in legume nodules, and van Gardingen and style speak about the interplay of crops with wind, together with the influence of crops on air flow 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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Uptake generally followed stornatal opening. , 1977; Caput and Belot, 1978; Biggs and Davis, 1980; Amundson and Weinstein, 1981; Natori and Totsuka, 1984b). Amundson and Weinstein (1981) found the more sensitive cultivar of two soybean cultivars to close its stomata less, while Bonte et al. (1977) found that the more sensitive cultivars of Pelargonium were the ones to close stomata slowesr in response to acute SO2 exposures. Caput and Belot (1978) found the absorbed amount of SO2 to be proportional to the inverse of the mean stornatal resistance of exposed pine needles, and that the extent of visible injury was related to the quantity absorbed.

1987). Eventually the anions of NO2 are turned into reduced nitrogenous compounds, which accounts for the large increases in plant nitrogen content and growth (Rowland, 1986). e. 1-5ppb NO and NO2 (Johansson, 1987). It was found that 42 H. SAXE the uptake of NO2 became essentially zero at these low concentrations. The primary consequence of this is that more NO, is left in the atmosphere and turned into HN03, which may be more damaging to the plants and ecosystems than NO,, either by dry deposition or through rain-out and acidification.

It simulates a common situation in urban areas where SO2 peaks may reach several hundred parts per billion (Wentzel, 1985); 2. their use in simple mechanistic studies of interactions between photosynthesis, the stomata1 mechanism and uptake, since these are fundamentally the same with chronic exposures; and 3. g. Saxe and Murali, 1989a,b,c; Saxe 1989). Use of short-term exposures to elucidate more complex causal mechanisms (e. g. photochemical and biochemical responses) are only of suggestive value in relation to most ambient situations, and should be re-evaluated in long-term studies to determine their realistic value.

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