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Under low CO\n                    <jats:sub>2<\/jats:sub>\n                    , the unique CO\n                    <jats:sub>2<\/jats:sub>\n                    concentrating mechanism in aquatic plants, bicarbonate use, can suppress photorespiration. However, it remains unknown (1) to what extent bicarbonate use reduces photorespiration, (2) how exactly photorespiration varies between bicarbonate\u2010users and CO\n                    <jats:sub>2<\/jats:sub>\n                    \u2010obligate users under CO\n                    <jats:sub>2<\/jats:sub>\n                    \u2010fluctuated environments, and (3) what are differences in Rubisco characteristics between these two types of aquatic plants. In the present study, the bicarbonate user\n                    <jats:italic>Ottelia alismoides<\/jats:italic>\n                    and its phylogenetically close CO\n                    <jats:sub>2<\/jats:sub>\n                    \u2010obligate user\n                    <jats:italic>Blyxa japonica<\/jats:italic>\n                    were chosen to answer these questions. The results showed that bicarbonate use saved ~13% carbon loss under low CO\n                    <jats:sub>2<\/jats:sub>\n                    via decreasing photorespiration in\n                    <jats:italic>O. alismoides<\/jats:italic>\n                    . Through bicarbonate use, the photorespiration of\n                    <jats:italic>O. alismoides<\/jats:italic>\n                    was kept stable both under high and low underwater CO\n                    <jats:sub>2<\/jats:sub>\n                    concentrations, while the photorespiration significantly increased in the CO\n                    <jats:sub>2<\/jats:sub>\n                    \u2010obligate user\n                    <jats:italic>B. japonica<\/jats:italic>\n                    under low CO\n                    <jats:sub>2<\/jats:sub>\n                    . However,\n                    <jats:italic>B. japonica<\/jats:italic>\n                    showed a significantly higher photosynthesis rate than\n                    <jats:italic>O. alsimoides<\/jats:italic>\n                    when CO\n                    <jats:sub>2<\/jats:sub>\n                    was sufficient. These differences could be related to the kinetic characteristics of Rubisco showing a higher carboxylation turnover rate (Kcat) in\n                    <jats:italic>B. japonica<\/jats:italic>\n                    , and the similar affinity to CO\n                    <jats:sub>2<\/jats:sub>\n                    (Kc) and specificity factor (Sc\/o) in these two species that might be determined by the variation of six amino acid residuals in Rubisco large subunit sequences, especially the site 281 (A vs. S) and 282 (H vs. F). All these differences in photorespiration and kinetic characteristics of Rubisco could explain the distribution patterns of bicarbonate users and CO\n                    <jats:sub>2<\/jats:sub>\n                    \u2010obligate users in the field.\n                  <\/jats:p>","DOI":"10.1111\/ppl.70085","type":"journal-article","created":{"date-parts":[[2025,1,29]],"date-time":"2025-01-29T03:45:17Z","timestamp":1738122317000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":3,"title":["Bicarbonate use reduces the photorespiration in\n                    <i>Ottelia alismoides<\/i>\n                    adapting to the\n                    <scp>\n                      CO\n                      <sub>2<\/sub>\n                    <\/scp>\n                    \u2010fluctuated aquatic systems"],"prefix":"10.1111","volume":"177","author":[{"ORCID":"https:\/\/orcid.org\/0009-0004-9470-6617","authenticated-orcid":false,"given":"Pengpeng","family":"Li","sequence":"first","affiliation":[{"name":"Hainan Key Laboratory for Sustainable Utilization of Tropical Bioresource, School of Life and Health Sciences, Hainan University  Haikou China"},{"name":"Key Laboratory of Aquatic Botany and Watershed Ecology Wuhan Botanical Garden, Chinese Academy of Sciences  Wuhan China"},{"name":"One Health Institute, Hainan University  Haikou China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0009-0006-3378-9396","authenticated-orcid":false,"given":"Zuying","family":"Liao","sequence":"additional","affiliation":[{"name":"Key Laboratory of Aquatic Botany and Watershed Ecology Wuhan Botanical Garden, Chinese Academy of Sciences  Wuhan China"},{"name":"University of Chinese Academy of Sciences  Beijing China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0009-0003-2120-4942","authenticated-orcid":false,"given":"Bo","family":"Zhang","sequence":"additional","affiliation":[{"name":"Key Laboratory of Aquatic Botany and Watershed Ecology Wuhan Botanical Garden, Chinese Academy of Sciences  Wuhan China"},{"name":"University of Chinese Academy of Sciences  Beijing China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-0230-5134","authenticated-orcid":false,"given":"Liyan","family":"Yin","sequence":"additional","affiliation":[{"name":"Hainan Key Laboratory for Sustainable Utilization of Tropical Bioresource, School of Life and Health Sciences, Hainan University  Haikou China"},{"name":"One Health Institute, Hainan University  Haikou 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