<?xml version="1.0" encoding="UTF-8"?><xml><records><record><source-app name="Biblio" version="7.x">Drupal-Biblio</source-app><ref-type>17</ref-type><contributors><authors><author><style face="normal" font="default" size="100%">Stahl-Rommel, Sarah</style></author><author><style face="normal" font="default" size="100%">Kalra, Isha</style></author><author><style face="normal" font="default" size="100%">D'Silva, Susanna</style></author><author><style face="normal" font="default" size="100%">Hahn, Mark M.</style></author><author><style face="normal" font="default" size="100%">Popson, Devon</style></author><author><style face="normal" font="default" size="100%">Cvetkovska, Marina</style></author><author><style face="normal" font="default" size="100%">Rachael M. Morgan-Kiss</style></author></authors></contributors><titles><title><style face="normal" font="default" size="100%">Cyclic electron flow (CEF) and ascorbate pathway activity provide constitutive photoprotection for the photopsychrophile, &lt;i&gt;Chlamydomonas&lt;/i&gt; sp. UWO 241 (renamed &lt;i&gt;Chlamydomonas priscuii&lt;/i&gt;)</style></title><secondary-title><style face="normal" font="default" size="100%">Photosynthesis Research</style></secondary-title><short-title><style face="normal" font="default" size="100%">Photosynth Res</style></short-title></titles><keywords><keyword><style  face="normal" font="default" size="100%">Antarctica</style></keyword><keyword><style  face="normal" font="default" size="100%">ascorbate</style></keyword><keyword><style  face="normal" font="default" size="100%">Cyclic electron flow</style></keyword><keyword><style  face="normal" font="default" size="100%">Photosystem I</style></keyword><keyword><style  face="normal" font="default" size="100%">Psychrophile</style></keyword><keyword><style  face="normal" font="default" size="100%">ROS</style></keyword></keywords><dates><year><style  face="normal" font="default" size="100%">2022</style></year><pub-dates><date><style  face="normal" font="default" size="100%">03/2022</style></date></pub-dates></dates><urls><web-urls><url><style face="normal" font="default" size="100%">https://link.springer.com/article/10.1007/s11120-021-00877-5</style></url></web-urls></urls><volume><style face="normal" font="default" size="100%">151</style></volume><pages><style face="normal" font="default" size="100%">235 - 250</style></pages><language><style face="normal" font="default" size="100%">eng</style></language><abstract><style face="normal" font="default" size="100%">&lt;p&gt;Under environmental stress, plants and algae employ a variety of strategies to protect the photosynthetic apparatus and maintain photostasis. To date, most studies on stress acclimation have focused on model organisms which possess limited to no tolerance to stressful extremes. We studied the ability of the Antarctic alga &lt;i&gt;Chlamydomonas&lt;/i&gt; sp. UWO 241 (UWO 241) to acclimate to low temperature, high salinity or high light. UWO 241 maintained robust growth and photosynthetic activity at levels of temperature (2 &amp;deg;C) and salinity (700 mM NaCl) which were nonpermissive for a mesophilic sister species, &lt;i&gt;Chlamydomonas raudensis&lt;/i&gt; SAG 49.72 (SAG 49.72). Acclimation in the mesophile involved classic mechanisms, including downregulation of light harvesting and shifts in excitation energy between photosystem I and II. In contrast, UWO 241 exhibited high rates of PSI-driven cyclic electron flow (CEF) and a larger capacity for nonphotochemical quenching (NPQ). Furthermore, UWO 241 exhibited constitutively high activity of two key ascorbate cycle enzymes, ascorbate peroxidase and glutathione reductase and maintained a large ascorbate pool. These results matched the ability of the psychrophile to maintain low ROS under short-term photoinhibition conditions. We conclude that tight control over photostasis and ROS levels are essential for photosynthetic life to flourish in a native habitat of permanent photooxidative stress. We propose to rename this organism &lt;i&gt;Chlamydomonas priscuii&lt;/i&gt;.&lt;/p&gt;</style></abstract><issue><style face="normal" font="default" size="100%">3</style></issue></record><record><source-app name="Biblio" version="7.x">Drupal-Biblio</source-app><ref-type>17</ref-type><contributors><authors><author><style face="normal" font="default" size="100%">Raymond, James A.</style></author><author><style face="normal" font="default" size="100%">Rachael M. Morgan-Kiss</style></author><author><style face="normal" font="default" size="100%">Stahl-Rommel, Sarah</style></author></authors></contributors><titles><title><style face="normal" font="default" size="100%">Glycerol is an osmoprotectant in two Antarctic &lt;I&gt;Chlamydomonas&lt;/I&gt; species from an ice-covered saline lake and is synthesized by an unusual bidomain enzyme</style></title><secondary-title><style face="normal" font="default" size="100%">Frontiers in Plant Science</style></secondary-title></titles><keywords><keyword><style  face="normal" font="default" size="100%">Antarctica</style></keyword><keyword><style  face="normal" font="default" size="100%">Chlamydomonas</style></keyword><keyword><style  face="normal" font="default" size="100%">glycerol synthesis</style></keyword><keyword><style  face="normal" font="default" size="100%">glycerol-3-phosphate dehydrogenase</style></keyword><keyword><style  face="normal" font="default" size="100%">Lake Bonney</style></keyword><keyword><style  face="normal" font="default" size="100%">phosphoserine phosphatase</style></keyword></keywords><dates><year><style  face="normal" font="default" size="100%">2020</style></year><pub-dates><date><style  face="normal" font="default" size="100%">08/2020</style></date></pub-dates></dates><urls><web-urls><url><style face="normal" font="default" size="100%">https://www.frontiersin.org/articles/10.3389/fpls.2020.01259/full</style></url></web-urls></urls><volume><style face="normal" font="default" size="100%">11</style></volume><language><style face="normal" font="default" size="100%">eng</style></language><abstract><style face="normal" font="default" size="100%">&lt;p&gt;Glycerol, a compatible solute, has previously been found to act as an osmoprotectant in some marine &lt;em&gt;Chlamydomonas&lt;/em&gt; species and several species of &lt;em&gt;Dunaliella&lt;/em&gt; from hypersaline ponds. Recently, &lt;em&gt;Chlamydomonas reinhardtii&lt;/em&gt; and &lt;em&gt;Dunaliella salina&lt;/em&gt; were shown to make glycerol with an unusual bidomain enzyme, which appears to be unique to algae, that contains a phosphoserine phosphatase and glycerol-3-phosphate dehydrogenase. Here we report that two psychrophilic species of &lt;em&gt;Chlamydomonas&lt;/em&gt; (&lt;em&gt;C.&lt;/em&gt; spp. UWO241 and ICE-MDV) from Lake Bonney, Antarctica also produce high levels of glycerol to survive in the lake&amp;rsquo;s saline waters. Glycerol concentration increased linearly with salinity and at 1.3 M NaCl, exceeded 400 mM in &lt;em&gt;C.&lt;/em&gt; sp. UWO241, the more salt-tolerant strain. We also show that both species expressed several isoforms of the bidomain enzyme. An analysis of one of the isoforms of &lt;em&gt;C.&lt;/em&gt; sp. UWO241 showed that it was strongly upregulated by NaCl and is thus the likely source of glycerol. These results reveal another adaptation of the Lake Bonney &lt;em&gt;Chlamydomonas&lt;/em&gt; species that allow them to survive in an extreme polar environment.&lt;/p&gt;</style></abstract></record></records></xml>