Journal of Siberian Federal University. Biology / Growth of Purple Sulfur Bacterium Thiocapsa sp. Shira_1 at Low Temperatures Characteristic of the Chemocline of Lake Shira

Full text (.pdf)
Issue
Journal of Siberian Federal University. Biology. 2018 11 (4)
Authors
Rogozin, Denis Y.; Zykov, Vladimir V.; Tarnovsky, Maxim O.
Contact information
Rogozin, Denis Y.: Institute of Biophysics SB RAS FRC “Krasnoyarsk Science Center SB RAS” 50/50 Akademgorodok, Krasnoyarsk, 660036, Russia; Siberian Federal University 79 Svobodny, Krasnoyarsk, 660041, Russia; ; Zykov, Vladimir V.: Institute of Biophysics SB RAS FRC “Krasnoyarsk Science Center SB RAS” 50/50 Akademgorodok, Krasnoyarsk, 660036, Russia; Tarnovsky, Maxim O.: Institute of Biophysics SB RAS FRC “Krasnoyarsk Science Center SB RAS” 50/50 Akademgorodok, Krasnoyarsk, 660036, Russia
Keywords
purple sulfur bacteria; chemocline; temperature; batch culture
Abstract

Forecasting the abundance of phototrophic sulfur bacteria in lakes is very important because 1) these bacteria are major consumers of hydrogen sulfide, and 2) fossil carotenoids of these bacteria are retrospective biomarkers of limnological conditions. Therefore, understanding the factors controlling the dynamics of the abundance of phototrophic sulfur bacteria in a lake is necessary both for the prediction of hydrogen sulfide content and for paleo-limnological reconstruction. Based on long-term monitoring of the abundance of purple sulfur bacteria (PSB) in the saline meromictic Lake Shira (South Siberia, Khakassia), we proposed a hypothesis that relatively small changes in water temperature in the cold deep chemocline affect the PSB abundance in the lake. We tested this hypothesis experimentally. The purple sulfur bacterium Thiocapsa sp. Shira_1 (Chromatiaceae) from Lake Shira (South Siberia, Russia) was grown on a sulfide-containing synthetic medium under anoxic conditions in batch culture at low temperatures, from -1ºC to +8ºC, which were similar to in situ temperatures observed in the chemocline of Lake Shira. The cell growth rate at +8ºC was similar to the growth rate at room temperature, whereas there was no growth at -1ºC and +5ºC. Therefore, the variations in the biomass of purple sulfur bacteria (PSB) observed in Lake Shira could be caused by variations in chemocline temperature. The high correlation between chemocline temperature and PSB biomass supported this conclusion

Pages
333-339
Paper at repository of SibFU
https://elib.sfu-kras.ru/handle/2311/109185

Creative Commons License This work is licensed under a Creative Commons Attribution-NonCommercial 4.0 International License (CC BY-NC 4.0).