Biochemical characteristics of fig plant adaptation to low temperatures
The conditions on the Southern Coast of the Crimea are favorable for the cultivation of fig plants, but slight frosts complicate overwintering. Therefore, it is important to find the degree of frost resistance of fig plants and its correlation with biochemical parameters. A selection of fig trees was examined: Ficus carica L. (cultivars Crymsky Cherny, Sary Istambulsky, Sabrutsia Rozovaya and Opylitel Nikitsky), F. palmata Forsk., and F. virgata Roxb. Frost resistance of shoots and buds was studied at the end of January, 2018 and 2019, using an artificial cold treatment from -8 to -12°С. Cold treatment at -8°С revealed interspecific differences in frost resistance. In F. carica species, the resistance of buds was three times greater than in other studied species. Catalase activity decreased in F. virgata and F. palmata species, did not change in Crymsky Cherny and Opylitel Nikitsky, and increased in Sary Istambulsky and Sabrutsia Rozovaya. Peroxidase activity had different trends. Cold treatment at -10°С revealed differences in frost resistance among cultivars. Catalase activity decreased in F. virgata and F. palmata species, while in F. carica it increased. Peroxidase activity was not changed. After cold treatment at -12°C, catalase activity decreased, except in Sabrutsia Rozovaya and Opylitel Nikitsky, where it increased. Peroxidase activity mostly increased, but in Sabrutsia Rozovaya and Opylitel Nikitsky, it was unchanged. Proline concentration increased. Thus, Opylitel Nikitsky and Sabrutsia Rozovaya demonstrated maximum frost resistance. Correlation between catalase activity and fig plant frost resistance was found: under low-temperature stress, enzyme activity increased in frost-resistant cultivars.
Grebennikova, O.A., Brailko, V.A. and Plugatar, Yu.V. (2021). Biochemical characteristics of fig plant adaptation to low temperatures. Acta Hortic. 1310, 205-210
Ficus L., fig buds, frost resistance, catalase activity, peroxidase activity, proline content