Mannitol content in different parts of Fucus vesiculosus thallus from the Barents Sea in different seasons

The data on the mannitol content in different parts of the brown algae F. vesiculosus thallus from the Barents Sea have been obtained for the first time in different seasons. Seaweed for research was collected in the Belokamennaya Bay of the Kola Bay once a season during the year. Determination of mannitol has been carried out in different parts of the thallus of algae in the physiological activity and functions performed: the apical part, the middle part of the thallus, the vesicles and the receptacles. It has been determined that the season of algae harvest significantly affects the mannitol content in different parts of the F. vesiculosus thallus. The trend of changes in the mannitol content in all researched parts of the thallus has been found: the lowest mannitol content is detected in winter (90.9-99.2 mg/g dry weight), in the summer - autumn period its content has increased to the highest within a year (111.4-150.4 mg/g dry weight). The obtained data on the change in the mannitol content in different parts of the brown alga F. vesiculosus thallus in different seasons corresponded to the previously obtained data on the change in the mannitol content in the mean sample. Unlike Saccharina latissima ( Laminaria saccharina ) growing in the Oscar Cove of the Barents Sea, high heterogeneity in the mannitol distribution over the brown alga F. vesiculosus thallus has not been observed. In January, April and October, there was no significant difference in the mannitol content in different parts of the brown alga F. vesiculosus thallus. In August, the greatest heterogeneity in the mannitol content in different parts of the F. vesiculosus thallus was determined. The mannitol content in F. vesiculosus receptacles in April and August was almost identical despite the varying maturity of the reproductive cells.