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Опубликовано
2014-07-11
Опубликовано на SciPeople2014-07-11 21:41:11
ЖурналDose-Response, 12:121–135, 2014
Hormesis and Paradoxical Effects of Wheat Seedling (Triticum aestivum L.) Parameters upon Exposure to Different Pollutants in a Wide Range of Doses
Dose-Response, 12:121–135, 2014
DOI: 10.2203/dose-response.13-017.Erofeeva
Аннотация
Chlorophyll and carotenoid content (ChCar), lipid peroxidation (LP) and growth
parameters (GP) in plants are often used for environmental pollution estimation.
However, the nonmonotonic dose–response dependences (hormesis and paradoxical
effects) of these indices are insufficiently explored following exposure to different pollu-
tants. In this experiment, we studied nonmonotonic changes in ChCar, LP, GP in wheat
seedlings (Triticum aestivum L.) upon exposure to lead, cadmium, copper, manganese,
formaldehyde, the herbicide glyphosate, and sodium chloride in a wide range from sub-
lethal concentration to 102-105 times lower concentrations. 85.7% of dose–response
dependences were nonmonotonic (of these, 5.5% were hormesis and paradoxical effects
comprised 94.5%). Multiphasic dependences were the most widespread type of paradoxi-
cal effect. Hormesis was a part of some multiphasic responses (i.e. paradoxical effects),
which indicates a relationship between these phenomena. Sublethal pollutant concentra-
tions significantly increased LP (to 2.0-2.4 times, except for manganese and glyphosate)
and decreased GP (to 2.1-36.6 times, except for glyphosate), while ChCar was reduced
insignificantly, normalized or even increased. Lower pollutant concentrations caused a
moderate deviation in all parameters from the control (not more than 62%) for hormesis
and paradoxical effects. The seedling parameters could have different types of nonmo-
notonic responses upon exposure to the same pollutant.
Key words: Triticum aestivum L., dose–response dependences, physiological parameters, environmen-
tal pollutants, plant hormesis, plant paradoxical effects.