Abstract
The purpose of this study is to examine the ratios of absorption by photosynthetic complex substances and other components of leaf extracts obtained from conifer family plants of different genera. Such ratios were determined by absorption spectrometry method using unconventional numerical values of absorption spectra, such as wave length of the highest maximum, coefficient of relative photoabsorption, blue-red coefficient, total absorption intensity and relative share of absorption by photosynthetic complex substances in total absorption. The intensity of light energy’s utilization by conifers was shown to be the highest among conifers of pine family, to be the lowest among spruce family plants and to have intermediate values among plants of fir and cypress genera. Numerical indicators of absorption spectra used in this article reflect the properties of photoreceptive system of coniferous plants and could be used in photosynthesis studies and also as criteria in environmental science and plant resources monitoring during assessment of the impact anthropogenic, climate and other factors have on coniferous forests.
Highlights
Photosynthesis mechanisms [1, 2] and properties of basic pigments of the photosynthetic complex (PSC) of chlorophyll and carotenoids, which absorb in a visible section of the optical spectrum, have so far been thoroughly studied [3, 4]
The purpose of this study is to examine the rations of absorption by PSC substances and other components of leaf extracts obtained from conifer family plants of different genera
The mean λHM values in the fir and pine extracts’ normalized absorption spectrum (NAS) exceed that of spruces by 3 to 5 nm, and the mean λHM value in Chamaecyparis lawsonianaextract’s NAS exceeds it by 10 nm
Summary
Photosynthesis mechanisms [1, 2] and properties of basic pigments of the photosynthetic complex (PSC) of chlorophyll and carotenoids, which absorb in a visible section of the optical spectrum, have so far been thoroughly studied [3, 4]. It is important to use NIAS to compare the intensity of light absorption by the leaves of coniferous trees, which prefer different habitats in the forest. The purpose of this study is to examine the rations of absorption by PSC substances and other components of leaf extracts obtained from conifer family plants of different genera. Research can be performed on the following plan: 1) select several species of spruce, fir, pine and cypress for comparison, 2) to conduct spectrophotometry of extracts from the leaves of these trees, 3) to determine the numerical indicators of the absorption spectra of the extracts, 4) to compare the obtained numerical indicators and 5) to conclude on the priorities of absorption activity among conifers
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