Visn. Hark. nac. agrar. univ., Ser. Biol., 2020, Issue 3 (51), p. 48-57


O.M. Nedukha

Kholodny Institute of Botany

of National Academy of Science of Ukraine

(Kyiv, Ukraine)


Using a cytochemical method and laser confocal microscopy, a sensitivity of content and distribution of monolignols in the leaves of Phragmites australis, grown in different natural conditions, was established. The leaves at stage of vegetative growth of two ecotypes of Ph. australis, which grew in water and on land, were studied. We present results obtained by comparing the data on the leaves of Ph. australis of air-water and terrestrial plants growing in natural conditions (Kyiv, Ukraine). It was found that the decrease in soil moisture leads to an increase in ratio of syringyl monolignol to guaiacyl (S/G) and to an increase in total content of monolignols (S+G) in epidermis and tissues of vessel bundles of the terrestrial plants. It was assumed that changing the ratio of monolignols and changing their content in the epidermis of leaves of terrestrial reed plants is one of the mechanisms of plant adaptation to lower soil moisture, which reduces transpiration and maintains optimal water potential in leaves of Ph. australis growing on land. Based on the obtained experimental data, we believe that high content of syringyl monolignol, which gives high strength to leaves and stems of terrestrial reeds, can serve as a marker for commercial use of these plants in various sectors of economy.

Key words: Phragmites australis, lignin, soil moisture, leaf, laser confocal microscopy



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