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Despite the central role of photosynthesis in plant growth, the effects of prolonged heat stress on the primary reactions of photosynthesis remain poorly understood. Here, we studied how long\u2010term heat exposure affects growth and photosynthetic performance in the model plant\n                    <jats:italic>Arabidopsis thaliana<\/jats:italic>\n                    . Plants were exposed daily to high temperature (38\u00b0C) for 4 h throughout the growth period. Conflicting to earlier studies, we show that PSII\u2010LHCII remain relatively intact under prolonged heat despite slightly reduced \u2206F\/F\n                    <jats:sub>m<\/jats:sub>\n                    \u2019, relative electron transfer rate (rETRII) and proportion of open reaction centers (qL). Strikingly, the content of the Cytochrome\n                    <jats:italic>\n                      b\n                      <jats:sub>6<\/jats:sub>\n                      f\n                    <\/jats:italic>\n                    complex, which mediates electron transfer between the photosystems, was reduced by 30\u201340%. This leads to more oxidized downstream electron acceptors and prevents PSI over\u2010reduction in conditions where carbon assimilation is inhibited.\n                  <\/jats:p>","DOI":"10.1111\/pce.70730","type":"journal-article","created":{"date-parts":[[2026,7,8]],"date-time":"2026-07-08T20:35:06Z","timestamp":1783542906000},"page":"8099-8111","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":1,"title":["Daily Heat Stress Induces Donor\u2010Side Limitation of PSI Via Downregulation of the Cyt\n                    <i>\n                      b\n                      <sub>6<\/sub>\n                      f\n                    <\/i>\n                    Complex"],"prefix":"10.1111","volume":"49","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-9243-7028","authenticated-orcid":false,"given":"Laura","family":"Laihonen","sequence":"first","affiliation":[{"name":"Molecular Plant Biology, Department of Life Technologies University 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