Effects of Sulphur Dioxide on Sugar and Free Amino Acid Content of Pine Seedlings |
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Authors: | S S MALHOTRA S K SARKAR |
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Institution: | Northern Forest Research Centre, Canadian Forestry Service, Fisheries and Environment Canada, 5320 –122 Street, Edmonton, Alberta T6H 3S5 Canada |
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Abstract: | Treatment of jack pine (Pinus banksiana Lamb.) seedlings with gaseous SO2 resulted in a shift between the reducing and non-reducing sugars. Increasing concentrations of gaseous SO2 caused an increase in reducing sugars and a decline in the non-reducing sugars, suggesting a conversion from the latter to the former at high SO2 concentrations. The total amino acid content of the intact tissues also increased with increasing concentrations of gaseous SO2. Gas-liquid chromatographic analyses of the amino acids indicated that SO2 (1. 34 mg · m-3 for 96 h) resulted in an increase in the content of alanine, valine, glycine, isoleucine, leucine, threonine, aspartic acid tyrosine, lysine, and arginine, and a decrease in the content of serine and glutamic acid. The enzymatic and other implications of such changes are discussed. |
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