Olga Zorikova’s research while affiliated with Federal Scientific Center of the East Asia Terrestrial Biodiversity FEB RAS and other places

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Publications (3)


Effect of 1% aqueous extract of Reynoutria japonica upon the germination of conidia of Septoria glycines Hemmi. (F = 7.28; P = 0.01)
Effect of Reynoutria japonica extract upon germination and upon resistance of its seeds against phytopathogenic fungi Triticum aestivum L., Hordeum vulgare L., and Glycine max (L.) Merr
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March 2020

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120 Reads

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10 Citations

Organic Agriculture

Svetlana Borovaya

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Ludmila Lukyanchuk

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Olga Zorikova

A promising direction in organic agriculture is the stimulation of growth and development of cultivated plants, induction of resistance to pathogens using biologically active substances of plant origin. From this point of view, the special interest presents the allelopathic active plant of the family Polygonaceae reynoutria Japanese (Reynoutria japonica Houtt.), which is an aggressive invasive species, widely spread in the countries of the Western Europe, in the USA, and the European part of Russia. Dealcoholized aqueous solutions with the concentrations of 0.5%, 1%, 5%, 10%, 15%, and 20% which were obtained from 70% EtOH extract of green mass of R. japonica were used for the spraying of seeds of the test cultures; Triticum aestivum L., Hordeum vulgare L., and Glycine max (L.) Merr. were germinated at a temperature of 20 ± 1 °C in the planters. The studied concentrations of the extract had antifungal activity and stimulated the germination energy and the seed sprouting in comparison with the untreated control. The maximum positive effect upon the growth processes of seeds of the test cultures had the extract solutions in concentrations of 1% and 5%—the sprouting increased to 93.5–99.5%, which is higher than the control version by 7–21%. An increase in the concentration of the solution above 5% did not lead to a further increase in the efficiency of the extract. It is interesting that under the treatment of crops with the same concentrations of solutions of the extract of R. japonica, the response reaction of the allelochemicals of T. aestivum is higher than that of H. vulgare and G. max. In the laboratory experiment to study the effect of the extract of R. japonica for the viability of the fungus Septoria glycines Hemmi, it was found that 1% solution of the extract suppressed the growth of S. glycines: only 75% of the total number of spores placed into the thermostat sprouted while 90% of the spores were viable at the control.

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Fig. 1: Index of allelopathic soil activity of P. rupestris and P. scabiosifolia donor plants with respect to parts of seedlings of the test culture 
Morphometric indices of seedlings of the test culture (Cucumis sativus, mm (x ± Sx)
Allelopathic Activity of Patrinia scabiosifolia and Patrinia rupestris

June 2017

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55 Reads

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2 Citations

Biomedical & Pharmacology Journal

Olga Zorikova

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Vladimir Koldaev

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[...]

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Ekaterina Litvinova

The focus of the research is allelopathic activity of Patrinia scabiosifolia and Patrinia rupestris. Secondary metabolites of higher plants which regulate growth are of interest as the basis for possible agents to be used in crop production. In order to study the phytogenic field, soil samples were selected. Gramineous and forb plant association soil was used as control. Cucumber seeds (Cucumis sativus) were used as test culture to identify the allelopathic activity of the phytopathogenic field. The activity of allelopathic substances contained in leaves, inflorescences, stems and rhizomes of P. scabiosifolia and P. rupestris was monitored by bioassays method, observing the impact of water extracts of plant material of certain plant parts upon the growth of seedlings of the test cultures. The results were analyzed by methods of mathematical statistics using Statistica 6.0. The bioassays of soil samples showed pronounced phyto-activity of the samples tested which owes to secretions of parts of the donor plants. The results obtained may be used for commercialization of P. scabiosifolia and P. rupestris material as a source of biologically active substances possessing sedative and adaptogenic properties, as well as in crop production. Metabolites of P. rupestris manifest an inhibitory action with maximum impact on the test crop caused by generative parts and leaves whereas the stem and underground parts show significantly smaller effect. Metabolites of parts of P. scabiosifolia did not have a meaningful impact on germination of test cultures and had a stimulating effect on the development of seedlings which was most pronounced in cases of extracts of leaves and generative parts.


Figure 2. Absorbance spectra of extracts from red flower petals of garden rose (Flame King) (1), from white ray florets of wild chamomile (2) and from yellow flowers of silverweed cinquefoil (3). Tags identify turning points, arrows identify steps; in vertical direction: absorbency A per unit; in horizontal direction: wavelength λ, nanometers.
Numerical indicators of AS of extracts from visually red flower petals of different plants
Applying Numerical Indicators of Absorbance Spectrum to Evaluating Color of Flower Petals

June 2016

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25 Reads

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1 Citation

Indian Journal of Science and Technology

Background/Objectives: The study deals with spectral photometry of extracts from flower petals. The objective is to apply numerical indicators at turning points of absorbance spectrum contours to identify the colors. Methods: Absorbance spectra of ethanol extracts from red, white and yellow flowers of 15 breeds of plants belonging to 8 genera have been registered by digital spectrophotometer in ultraviolet and in visible light range. The obtained spectra were processed by the proprietary computer program. Student's t-test was applied for statistical data processing. Findings: Wavelength, absorbency, the values of the first-order derivatives at maximum points, at turning points, at the steps of the absorption band contour and the absorption intensity values have been identified for each registered spectrum. Absorbance spectra of the analyzed extracts from petals of the flowers belonging to the same genus and to different genera with various coloring have been found plausibly and considerably different in terms of their numerical indicators. The most significant differences have been identified in such parameters as wavelength, absorbency at turning points and the values of the first-order derivatives at the step points of the absorbance spectra in the extracts from red flower petals, and in maximum wavelengths and absorption intensity in cases with white and yellow flower petals. The sets of the numerical indicators, grouped at the turning points of the absorbance spectrum contours, are individually specific for the flower petals of each plant genus. Applications/Improvements: The absorbance spectrum numerical indicators of petal extracts can serve as a generalized distinguishing taxonomic attribute to be employed in floriculture for certification of the newly created flowering plants.

Citations (3)


... Also, some plants have the ability to improve resistance to pathogens, as they are capable of producing elicitors that act on plant resistance [21][22][23][24], as is the case with nettle [25][26][27]. Japanese knotweed (Reynoutria japonica) extracts contain a large and complex array of biologically active substances, including phenolic compounds such as resveratrol, piceid, furans, phenol carboxylic acids and their derivatives, lignans, coumarins, catechins, and anthraquinones [28][29][30][31]. Given the characteristics of these plants extracts, it is expected that they will improve the physiological and biochemical parameters of the vines, along with the berry quality, and also positively influence the yield. ...

Reference:

Foliar Application of Nettle and Japanese Knotweed Extracts on Vitis vinifera: Consequences for Plant Physiology, Biochemical Parameters, and Yield
Effect of Reynoutria japonica extract upon germination and upon resistance of its seeds against phytopathogenic fungi Triticum aestivum L., Hordeum vulgare L., and Glycine max (L.) Merr

Organic Agriculture

... Around each plant, within its phytogenic field, an allelopathic sphere is formed; it is associated with the accumulation of physiologically active substances of colins released by plants into the environment. These substances can be both direct metabolites of the plant and its secondary metabolites, which the plant produces during its growth and development, as well as under the influence of environmental conditions [13]. ...

Allelopathic Activity of Patrinia scabiosifolia and Patrinia rupestris

Biomedical & Pharmacology Journal

... Potentials of radiometric studies of flowers were extensively discussed by Sir C.V. Raman during the 1960s [6][7][8][9] .Whilst extensive studies have been carried out on flower color and plant pigments using light transmission technique (spectroscopy) [10][11][12][13] there hardly exist any study on floral reflection in India. ...

Applying Numerical Indicators of Absorbance Spectrum to Evaluating Color of Flower Petals

Indian Journal of Science and Technology