Features of morphology and chemical composition of marine macrophytes of the western coast of the Caspian Sea

The studies of marine coastal plants of the northwestern Caspian Sea in 2023-2024 were conducted. Among them, Nanozostera noltei emissions were found. The results presented in the article reflect the study of the morphology of nanozosters, as well as its chemical composition. An assessment of the morphological features of two species of Caspian seagrasses, N. noltei and P. pectinatus, showed similarity in the morphology of leaf blades, which significantly differ in the shape of the leaf tip. Identification of the N. noltei species from the total mass of emissions is difficult due to the violation of the integrity of the plants and the similarity in appearance to the leaves of P. pectinatus during the formation of the emissions. The total content of pectin substances in the sea grass N. noltei reaches 19%, which indicates the potential of nanozostera for the production of zosterin.