Email this article ALLELOPATHIC EFFECTS OF SOME INVAsive SPECIES OF PLANTS-TRANSFORMERS
Abstract
The paper deals with the analyses of allelopathic effects of herbaceous invasive species-transformers that grow in Chernivtsi: Ambrosia artemisifolia L., Impatiens parviflora DC., Phalacroloma annuum (L.) Dumort., Solidago canadensis L., Rudbeckia laciniata L. We applied the bioassay method using Raphanus sativus L. var. radicula Pers.
Water extracts from leaves and roots of invasive species have been used for the analysis. The ratios of biomass to distilled water were 1:10 and 1:100. The extracts were infused for 24 hours at room temperature, filtered through a paper filter, and they were used for watering seeds / soots in Petri dishes. We used distilled water for the plants of control groups.
Biotester seeds were sprouted in a thermostat at a temperature of +25 ° С for three days. Later plants were grown in a cultivating room at +23 ° C. The following qualities of biotester seeds have been studied: germination energy percentage (on day 3), germination percentage (on day 7); biometric indices (on day 7): root length and shoot length.
Allelopathic effects of investigated invasive species have been proved. Planting qualities of the biotesters seed appeared to be the most intolerant to the effects of allelochemicals of species-transformers. Water extracts from the leaves and roots of all invasive species reduced germination energy percentage and germination percentage of R. sativus var. radicula Pers. seeds by 2-8 times.
The biometric parameters of the test object reacted to the investigated invasive species water extracts in different ways, which depended on the concentration, vegetative organ and plant species. In particular, the test-object root length in 45% of cases increased, it did not change in 35% and in 20% it reduced. At the same time, the length of the shoots did not change in 60% of cases, it increased in 35% and decreased only in 5% of cases in comparison with the control group. The length of the biotester root was a sensitive indicator and varied widely, whereas the length of the shoots of the test object varied in a narrow range. It has been determined that Ambrosia artemisifolia L. has the highest allelopathic activity among the studied species.
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DOI: https://doi.org/10.25128/2078-2357.19.1.9
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