Articles
OPTICAL CRITERIA FOR ASSESSMENT OF EFFICIENCY AND ADAPTOGENIC CHARACTERISTICS OF BIOLOGICALLY ACTIVE PREPARATIONS
Article number
1009_2
Pages
37 – 44
Language
English
Abstract
Qualitative and quantitative changes in biochemical composition of leaves and their inner structure that take place in adverse environmental conditions and in the process of plant adaptation provoke changes in their optical characteristics.
The recording of optical characteristics is a non-destructive method that does not require preparation of plant samples.
The aim of this work was to choose optical criteria for the assessment of biologically active preparations efficiency in enhancing plant non-specific tolerance for abiotic stressors.
Spectra of leaf reflectance were registered in situ using a fiber-optical spectrometer HR2000 combined with reflection sensor R200-7-UV-VIS (Ocean Optics, USA). The biologically active preparation used in the study was siliceous chelate micro fertilizer (SCM) developed in the Agrophysical Institute (St.
Petersburg). The initiation of oxidation stress leading to the decrease of photochemical processes activity and, as a consequence, to growth inhibition can be detected before the occurrence of external symptoms of plant growth suppression from the change of some reflection indices (chlorophyll, carotenoids, anthocyanins, flavonoids) and other optical indicators characterizing the down regulation activity of photosystem II. It was shown that foliar SCM treatment prevents metabolic disorder and growth inhibition in conditions of soil drought, nitrogen deficiency and UV-B irradiation.
Foliar SCM treatment preceding stressor action starts the process of plant adaptation.
Investigation results revealed that the mechanism of SCM protective action includes the synthesis of secondary metabolites (anthocyanins, flavonoids, etc.) which participate in spectral structure regulation of solar radiation getting into a leaf and start the process of plant active adaptation to changing environmental conditions.
The recording of optical characteristics is a non-destructive method that does not require preparation of plant samples.
The aim of this work was to choose optical criteria for the assessment of biologically active preparations efficiency in enhancing plant non-specific tolerance for abiotic stressors.
Spectra of leaf reflectance were registered in situ using a fiber-optical spectrometer HR2000 combined with reflection sensor R200-7-UV-VIS (Ocean Optics, USA). The biologically active preparation used in the study was siliceous chelate micro fertilizer (SCM) developed in the Agrophysical Institute (St.
Petersburg). The initiation of oxidation stress leading to the decrease of photochemical processes activity and, as a consequence, to growth inhibition can be detected before the occurrence of external symptoms of plant growth suppression from the change of some reflection indices (chlorophyll, carotenoids, anthocyanins, flavonoids) and other optical indicators characterizing the down regulation activity of photosystem II. It was shown that foliar SCM treatment prevents metabolic disorder and growth inhibition in conditions of soil drought, nitrogen deficiency and UV-B irradiation.
Foliar SCM treatment preceding stressor action starts the process of plant adaptation.
Investigation results revealed that the mechanism of SCM protective action includes the synthesis of secondary metabolites (anthocyanins, flavonoids, etc.) which participate in spectral structure regulation of solar radiation getting into a leaf and start the process of plant active adaptation to changing environmental conditions.
Authors
E.V. Kanash, G.G. Panova , S.YU. Blokhina
Keywords
Hordeum × vulgare, abiotic stresses, nitrogen deficiency, drought, reflection indices, resistance, physiological status
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