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Species like\n                          <jats:italic>Anabaena<\/jats:italic>\n                          sp. PCC 7120 physically separate C and N assimilation in different cell types. Even if separated, they are strongly intertwined, as N assimilation relies on the C skeletons and reducing power from photosynthesis, that in turn depends on N\u2010rich molecules as pigments and proteins.\n                        <\/jats:p>\n                      <\/jats:list-item>\n                      <jats:list-item>\n                        <jats:p>\n                          Whereas the two pathways have been extensively studied individually, this work investigates their interaction by analysing photosynthetic properties upon exposure to changes in light, carbon dioxide (CO\n                          <jats:sub>2<\/jats:sub>\n                          ) and N availability, including the contribution of photosynthetic electron fluxes.\n                        <\/jats:p>\n                      <\/jats:list-item>\n                      <jats:list-item>\n                        <jats:p>\n                          Growth depended on the availability of both light and CO\n                          <jats:sub>2<\/jats:sub>\n                          , whilst the N\n                          <jats:sub>2<\/jats:sub>\n                          fixation activity mainly relied on the C supply. Upon diazotrophic conditions, the total photosynthetic electron transport increased, with a modified contribution of different electron pathways. A mutant strain affected in the vehiculation of fixed N between cell types showed that the modulation of photosynthesis depended on the metabolic connection between assimilation pathways.\n                        <\/jats:p>\n                      <\/jats:list-item>\n                      <jats:list-item>\n                        <jats:p>Overall, data showed that the regulation of photosynthetic electron fluxes is a major component of the synergic metabolic relationship between C and N assimilation pathways upon dynamic environmental conditions.<\/jats:p>\n                      <\/jats:list-item>\n                    <\/jats:list>\n                  <\/jats:p>","DOI":"10.1111\/nph.71225","type":"journal-article","created":{"date-parts":[[2026,5,8]],"date-time":"2026-05-08T13:59:13Z","timestamp":1778248753000},"page":"94-110","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":1,"title":["Photosynthesis regulation impacts carbon and nitrogen assimilation in the diazotrophic cyanobacterium\n                    <i>Anabaena<\/i>\n                    sp.\n                    <scp>PCC<\/scp>\n                    7120"],"prefix":"10.1111","volume":"251","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-2950-7046","authenticated-orcid":false,"given":"Anna","family":"Santin","sequence":"first","affiliation":[{"name":"Department of Biology University of Padova  Padova 35131 Italy"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-6798-5084","authenticated-orcid":false,"given":"Mattia","family":"Storti","sequence":"additional","affiliation":[{"name":"Department of Biology University of Padova  Padova 35131 Italy"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-9000-4595","authenticated-orcid":false,"given":"Massimo","family":"Mezzavilla","sequence":"additional","affiliation":[{"name":"Department of Biology University of Padova  Padova 35131 Italy"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-5653-0973","authenticated-orcid":false,"given":"Anna","family":"Fortunato","sequence":"additional","affiliation":[{"name":"Department of Chemistry University of Padova  Padova 35131 Italy"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0009-0003-3152-072X","authenticated-orcid":false,"given":"Filippo","family":"Fiorin","sequence":"additional","affiliation":[{"name":"Department of Biology University of Padova  Padova 35131 Italy"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-4047-6487","authenticated-orcid":false,"given":"David C. 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