Free proline dynamics in leaves of Tilia cordata Mill. in changed conditions of environment
1996
Supuka, J.
The influence of changed environmental conditions on the free proline content in Tilia cordata Mill. leaves was investigated in Nitra (Slovakia). The evaluation was conducted in three urban vegetation model segments from the highest to the lowest environmental impact level: a thoroughfare (Sturova), a housing estate (Chrenova), and a city park. The comparative locality was the Arboretum Mlynany SAV. The highest content of SO2, NOx in air and dust pollution was at the thoroughfare (tab. 1). In comparison with the other segments of urban vegetation the increased content of Na, Cu, Pb, S in leaves of Tilia cordata Mill. in the same locality was also analysed (tab. 2). Besides, the application of de-icing salts at the thoroughfare is also significant. A proline content of 20-259 mg g** (-1) of green matter was analysed, whereas the proline content of fresh matter was only 10-70 mg g** (-1) in the city park (tab. 4). The content of free proline in leaves depended on individual genetic properties of woody plants. The functional dependence of the free proline content in leaves and the total sulphur content in leaves on precipitation was presented. Correlations are significant (fig. 1-6). Proline proved to be an appropriate chemomarker of woody plant adaptability to multifactorial stress of urban conditions
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