Interannual Variability of the Composition of Low-Molecular Metabolites of Ceratophyllum demersum (Ceratophyllaceae) in the Floodplain Lake with Changing Trophic Status
E. A. KURASHOV1,2, G. G. MITRUKOVA3, J. V. KRYLOVA4,2
1Institute of Limnology, RAS, 196105, St. Petersburg, Sevastianova str., 9
2ITMO University, 197101, St. Petersburg, Kronverkskiy ave., 49
3St. Petersburg State Chemical-Pharmaceutical Academy, 196105, St. Petersburg, Sevastianova str., 9
4Berg State Researh Institute on Lake and River Fisheries, 199053, St. Petersburg, emb. Makarova, 26
Keywords: Ceratophyllum demersum, цианобактерии, макрофиты, низкомолекулярные органические соединения, газовая хромато-масс-спектрометрия, аллелопатия, низкомолекулярный метаболом, cyanobacteria, macrophytes, low molecular weight organic compounds, gas chromatography-mass spectrometry, allelopathy, low molecular weight metabolome
Abstract
Regularities of formation of composition of low molecular weight organic compounds (LMWOC) of aquatic macrophytes in relation to changes in the water environment remain still poorly understood. The aim of this work was to conduct a comparative interannual study of the component composition of LMWOC of Ceratophyllum demersum L. (hornwort, rigid hornwort) growing in the floodplain lake with changing trophic state (Volga-Akhtuba floodplain). A high variability of the structure and content of individual compounds in hornwort in different trophic states of the lake was revealed. Active allelochemicals, of which free fatty acids seemed to be the most important, prevailed in the LMWOC in the “macrophytic” mesotrophic state of the lake. In the “cyanobacterial” eutrophic type of development of the lake, the composition of LMWOC of hornwort was characterized by the prevalence of compounds providing an enhanced protective reaction of the plant (of which the more important was manool) under conditions of the negative impacts of cyanobacteria, which also resulted in a decrease in the overall level of synthesis of compounds (almost 2-fold).
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