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In this study, TCP21, a member of the Class I TCP transcription factor family, was identified as a direct interacting partner of phyB. TCP21 negatively regulates photomorphogenesis through downregulating\n                    <jats:italic>HY5<\/jats:italic>\n                    expression and repressing the transcriptional activity of HY5. Moreover, phyB physically interacts with TCP21 and inhibits its transcriptional activity. Notably, phyB outcompetes HY5 for binding to TCP21, thereby attenuating the interaction between TCP21 and HY5 and alleviating TCP21\u2010mediated repression of HY5 DNA\u2010binding ability. Collectively, these findings establish TCP21 as a key component within the phyB\u2010HY5 signaling module, contributing to plant adaptation to dynamic light environments.\n                  <\/jats:p>","DOI":"10.1111\/tpj.70902","type":"journal-article","created":{"date-parts":[[2026,5,12]],"date-time":"2026-05-12T20:15:36Z","timestamp":1778616936000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["<scp>TCP21<\/scp>\n                    negatively regulates photomorphogenesis by integrating\n                    <scp>phyB<\/scp>\n                    \u2010 and\n                    <scp>HY5<\/scp>\n                    \u2010mediated signaling pathways in Arabidopsis"],"prefix":"10.1111","volume":"126","author":[{"given":"Mengdi","family":"Zhang","sequence":"first","affiliation":[{"name":"Shenzhen Key Laboratory of Plant Genetic Engineering and Molecular Design, Department of Biology School of Life Sciences, Institute of Plant and Food Science, Southern University of Science and Technology  Shenzhen 518055 China"},{"name":"Laboratory of Plant and Environment Interaction Study Tsientang Institute for Advanced Study  Hangzhou 310024 China"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Yueqin","family":"Heng","sequence":"additional","affiliation":[{"name":"State Key Laboratory for Conservation and Utilization of Subtropical Agro\u2010Bioresources, Guangdong Laboratory for Lingnan Modern Agriculture College of Life Sciences, South China Agricultural University  Guangzhou 510642 China"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0009-0009-4562-3256","authenticated-orcid":false,"given":"Siqi","family":"Yan","sequence":"additional","affiliation":[{"name":"Shenzhen Key Laboratory of Plant Genetic Engineering and Molecular Design, Department of Biology School of Life Sciences, Institute of Plant and Food Science, Southern University of Science and 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Wang","family":"Deng","sequence":"additional","affiliation":[{"name":"Laboratory of Plant and Environment Interaction Study Tsientang Institute for Advanced Study  Hangzhou 310024 China"},{"name":"National Key Laboratory of Wheat Improvement, Shandong Laboratory of Advanced Agricultural Sciences at Weifang Peking University Institute of Advanced Agricultural Sciences  Weifang Shandong 61000 China"},{"name":"State Key Laboratory of Protein and Plant Gene Research, Peking\u2010Tsinghua Center for Life Sciences School of Advanced Agriculture Sciences and School of Life Sciences, Peking University  Beijing 100871 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