Pigment content in leaves of an invasive species – Sosnowski's hogweed under conditions of soil contamination with mobile forms of lead

The article is devoted to the study of photosynthetic pigments in leaves of the invasive species Heracleum sosnowskyi Menden. The data on the content of chlorophylls (Chl a and Chl b) and carotenoids (Car) in leaves of Sosnowski's hogweed in ecotopes with different degrees of soil contamination with mobile forms of lead in the territory of Ivanovo Region are presented. As a result of the analysis of the obtained data it was found that the concentration of pigments in leaves of Sosnovsky's hogweed varies in a wide range (concentration of Chl a – from 1,32 to 6,98 mg/g; concentration of Chl b – from 0,46 to 2,72 mg/g, concentration of carotenoids – from 0,37 to 1,45 mg/g). The content of chlorophylls and carotenoids in leaves of Heracleum sosnowskyi generally decreases with increasing concentration of mobile forms of lead in soil, and the value of the ratio of the amount of Chl a / Chl b increases. The value of the ratio of the sum of chlorophylls (Chl a + Chl b) to the content of carotenoids (Car) remains stable. The obtained materials can serve as a basis for further study of the photosynthetic apparatus pigments of the invasive plant – Sosnovsky's hogweed under conditions of different degrees of anthropogenic impact in the Ivanovo Region and adjacent regions.