Response of short-term heat shock on photosynthetic activity of soil crust cyanobacteria

被引：0
作者：
Jana Kvíderová
Dhanesh Kumar
机构：
[1] University of South Bohemia in České Budějovice,Centre for Polar Ecology, Faculty of Science
[2] Academy of the Sciences of Czech Republic,Institute of Botany
[3] Institute of Chemical Technology,Department of Biochemistry and Microbiology
[4] University of Hyderabad,School of Life Sciences
[5] Visva-Bharati University,Department of Biotechnology, Siksha Bhavana
来源：
Protoplasma | 2020年 / 257卷
关键词：
Cyanobacteria; Heat stress; Photosynthesis; OJIP transient;
D O I：
暂无
中图分类号：
学科分类号：
摘要：
Short-term heat exposure in tropical regions can generate severe stress in the photosynthetic activity of soil crust cyanobacteria. We investigated the responses of two filamentous cyanobacteria, Scytonema tolypothrichoides and Tolypothrix bouteillei, to 1hr exposure at 35, 45, and 55 °C using variable chlorophyll fluorescence. Protocols for maximum quantum yield (FV/FM) and dark recovery of chlorophyll a fluorescence (OJIP) transient were applied. Heat exposure caused damage to the donor side of PSII, indicated by a decrease in FV/FM and a rapid increase in F0. After heat stress, photochemical energy utilization (φPo, φETo, and φRE1o) declined and energy dissipation (φDIo) increased. At 45 °C, the photosynthetic apparatus was reversibly damaged, since full recovery was observed after 7 days of relaxation. S. tolypothrichoides was more resistant to heat stress than T. bouteillei, confirming better adaptation to higher temperatures as observed in growth experiments.
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页码：61 / 73
页数：12
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