{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,9,16]],"date-time":"2026-09-16T21:35:14Z","timestamp":1789594514611,"version":"build-2803163510"},"reference-count":99,"publisher":"Oxford University Press (OUP)","issue":"1","license":[{"start":{"date-parts":[[2026,7,16]],"date-time":"2026-07-16T00:00:00Z","timestamp":1784160000000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"name":"Spanish Ministry of Sciences, Innovation and Universities"},{"DOI":"10.13039\/501100011033","name":"Spanish State Research Agency","doi-asserted-by":"publisher","id":[{"id":"10.13039\/501100011033","id-type":"DOI","asserted-by":"publisher"}]},{"name":"European Regional Development Funds","award":["PID2023-148523NB-I00"],"award-info":[{"award-number":["PID2023-148523NB-I00"]}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":[],"published-print":{"date-parts":[[2026,9,1]]},"abstract":"<jats:title>Abstract<\/jats:title>\n                  <jats:p>Aquatic photoautotrophs experience strong physicochemical constraints on inorganic carbon acquisition due to low CO2 and O2 diffusion in water producing a strong reduction in the gas conductance. These limitations have driven the widespread evolution of CO2-concentrating mechanisms (CCMs), which enhance CO2 availability around Rubisco and mitigate its catalytic inefficiencies.<\/jats:p>\n                  <jats:p>A compilation of the Rubisco kinetics and apparent photosynthetic CO2 affinities (1\/Km CO2) for a wide range of taxa shows that, despite the structural diversity of CCMs, there is an evolutive convergence among cyanobacteria, diatoms, haptophytes, and some rhodophytes and chlorophytes with similarly high 1\/Km CO2, therefore operating almost CO2-saturated photosynthesis under ambient conditions. Notably, none of the compiled species achieves CO2 saturation solely through Rubisco kinetics, underscoring the central role of CCMs in aquatic carbon fixation.<\/jats:p>\n                  <jats:p>CCM effectiveness (the ratio between Rubisco CO2 semi-saturation constant under 21% O2 and apparent photosynthetic semi-saturation constant for CO2, Kcair\/Km CO2) varies widely across the compiled species but is consistently higher in organisms possessing Rubisco-containing microcompartments, although pyrenoids are not strictly required for concentrating CO2 around Rubisco above ambient levels. Furthermore, an inverse relationship between Rubisco carboxylation efficiency and 1\/Km CO2 supports a divergent CCM-Rubisco coevolutionary trajectory compared with terrestrial plants, likely influenced by intracellular photosynthetic O2 accumulation under submerged conditions.<\/jats:p>\n                  <jats:p>The present review synthesizes current knowledge on CCM diversity and its regulation under future global change scenarios but also reanalyzes CCM effectiveness and its co-evolution with Rubisco kinetic traits across aquatic oxygenic phototrophs, highlighting major knowledge gaps to be filled by future research.<\/jats:p>","DOI":"10.1093\/plphys\/kiag507","type":"journal-article","created":{"date-parts":[[2026,7,16]],"date-time":"2026-07-16T11:50:41Z","timestamp":1784202641000},"source":"Crossref","is-referenced-by-count":1,"title":["Rubisco kinetic diversity and effectiveness of CO2-concentrating mechanisms in aquatic photosynthetic organisms"],"prefix":"10.1093","volume":"202","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-6452-8280","authenticated-orcid":false,"given":"Concepci\u00f3n","family":"I\u00f1iguez","sequence":"first","affiliation":[{"name":"Department of Ecology, Faculty of Sciences, University of M\u00e1laga , M\u00e1laga 29010 ,","place":["Spain"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-1679-7910","authenticated-orcid":false,"given":"Sebasti\u00e0","family":"Cap\u00f3-Bau\u00e7\u00e0","sequence":"additional","affiliation":[{"name":"Research Group on Plant Biology Under Mediterranean Conditions, Universitat de les Illes Balears-INAGEA , Palma, Balearic Islands 07122 ,","place":["Spain"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-1302-7213","authenticated-orcid":false,"given":"Francisco J L","family":"Gordillo","sequence":"additional","affiliation":[{"name":"Department of Ecology, Faculty of 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