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Contemporary Problems of Ecology

2006 year, number 2

Sulphur Metabolism and Leaf Morphostructure of Aboriginal and Introduced Species of the Genus

L. A. Zakharova, L. A. Barakhtenova


The time course of total, inorganic, organic and protein forms of sulphur, and the leaf morphostructure of aboriginal species of the genus Salix L. and those introduced to climatic conditions of the Novosibirsk Region were studied under the influence of low doses of SO2 (0.25 and 1 mg/m3). A correlation between the peculiarities of sulphur metabolism and the change of leaf morphostructure was demonstrated: the higher the background content of protein sulphur and the lower that of total sulphur was, the smaller were the losses of leaf turgor under the conditions of low SO2 concentration. Introduced Salix L., as compared to aboriginal ones were characterized by a lower background content of total sulphur and a higher content of protein sulphur, which contributes to conservation of leaf turgor and insures a higher resistance of introduced plants to the influence of low SO2 concentrations.