Home – Home – Jornals – Chemistry for Sustainable Development 2020 number 5

Begonia grandis is a unique representative of the genus Begonia inhabiting the temperate zone. The mechanisms of adaptation of this plant to low temperatures, in particular under the influence of physiologically active substances, are of great interest. The effects of the product of straw processing, ecotol, on the dynamics of the parameters of physiological state of Begonia grandis plants introduced in West Siberia (Novosibirsk), in a greenhouse and at an open ground were studied during air temperature drops at the end of the growing season. The concentrations of chlorophylls a and b , carotenoids, anthocyanins, flavones (luteolin, orientin) and flavonols (quercetin, kaempferol, hyperoside, isoquercitrin, and astragalin) were determined, and the ratios chlorophyll a / b , chlorophyll ( a + b )/carotenoids, chlorophyll ( a + b )/anthocyanins) in the leaves were calculated. With a decrease in the diurnal temperature to 10 ^oC and a short-term drop to negative temperatures, the open-ground plants treated with ecotol retained a higher proportion of the leaves (59.9% of their initial number) compared to the control ones (5.8 %), and the concentrations of chlorophyll and antioxidants (carotenoids, anthocyanins, isoquercitrin) in them was more significant (up to 3.1, 1.2, 12.8 and 11.2 mg/g, respectively) than in the leaves of control plants (up to 1.4; 0.5; 1.8 and 7.0 mg/g). The properties of ecotol as a complex stimulator of plant resistance were confirmed. Under low-temperature stress, it provided a higher physiological state of B. grandis plants during their transition to dormancy.