Tolerance of the photosynthetic apparatus to acidification of the growth medium as a possible determinant of CO₂-tolerance of the symbiotic microalga Desmodesmus sp. IPPAS-2014

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• 作者：V. V. Ptushenko ; A. E. Solovchenko
• 关键词：Key wordsacidification ; chlorophyll fluorescence ; stress ; tolerance
• 刊名：Biochemistry (Moscow)
• 出版年：2016
• 出版时间：December 2016
• 年：2016
• 卷：81
• 期：12
• 页码：1531-1537
• 全文大小：
• 刊物类别：Biomedical and Life Sciences
• 刊物主题：Biochemistry, general; Bioorganic Chemistry; Microbiology; Biomedicine, general;
• 出版者：Pleiades Publishing
• ISSN：1608-3040
• 卷排序：81

文摘

The symbiotic unicellular chlorophyte Desmodesmus sp. IPPAS-2014 capable of growth at extremely high CO₂ levels prohibitive for most other microalgae is an interesting model for studies of CO₂ tolerance mechanisms and a promising organism for CO₂ biocapture. We studied the initial (0-60 min) phase of acclimation of this microalga to an abrupt decrease in pH of the medium sparged with air/20% CO₂ mixture. Acclimation of the culture to these conditions was accompanied by a sharp decrease in photochemical activity of the chloroplast followed by its recovery with a characteristic time of 10-50 min. We hypothesize that acidification of the cultivation medium by dissolving CO₂ plays a key role in the observed decrease in the photochemical activity. The possible role of photosynthetic apparatus tolerance to abrupt acidification in overall high tolerance of symbiotic microalgae to extremely high CO₂ levels is discussed.