Abstract :
The influence of atmospheric pollution, caused by road transport, on the physiological and biochemical,ecological and
morphological parameters of common dandelion plants (TaraxacumofficinaleWiggs.l.) is considered in the article. Multiphase
dependences were obtained with a change in the direction of response,under the conditions of increasing traffic, in the
germination energy and the weight of seeds, ripened in inflorescences, cut off on the fourth day after flowering. In the gradient of
atmospheric pollution by motor vehicles, a complex three-phase dependence of the mass of seeds in the calathide, and the energy
of their germination, is observed. The extreme values of these parameters are 13-20% higher, than the control values,and they
are manifested when the traffic intensity is 2100 vehicles per hour, that allows to referthe dependence data to paradoxical effects.
The critical mass of viable seeds for their germination was 0.23 ± 0.007 mg, which was 10% higher, than the previously defined
critical mass of Taraxacumofficinale seeds. According to the Cheddock scale, the extent of interrelation between the weight of
seeds and their germination is high (R
2 = 0.80).
Excessive activation of protective systems is one of the signs of paradoxical effects. With anthropogenic load of 2100 vehicles per
hour, a sixfold increase in the activity of guaiacol peroxidases was recorded. At the same time, the level of lipid peroxidation in
plant leaves from the considered cenopopulation did not differ from control.
Keywords: bioindication, plant adaptation, anthropogenic load, energy of germination.
Keyword :
bioindication, plant adaptation, anthropogenic load, energy of germination.