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In\n                    <jats:italic>Arabidopsis thaliana<\/jats:italic>\n                    , it is well established that simulated shade, which mimics the proximity of other plants, triggers hypocotyl and petiole elongation, accelerates flowering and suppresses axillary bud growth. Although there is evidence that simulated shade affects reproduction beyond accelerating flowering, its impact on the development of reproductive tissues after plant architecture establishment (i.e., once flowering has begun) remains poorly explored. Here, we report that simulated shade promotes silique and pedicel elongation while reducing seed production, primarily by decreasing ovule number formation. Shade perception triggers rapid changes in gene expression in reproductive tissues, with some genes showing tissue\u2010specific responses and others being induced in both seedlings and reproductive tissues, highlighting a conserved core of shade\u2010responsive genes associated with light perception, photosynthesis and hormone regulation. However, while shade\u2010induced elongation responses occur rapidly, reduction in ovule number requires prolonged shade exposure, suggesting distinct regulatory pathways for these responses. These findings shed light on the complex interplay between common (e.g., elongation and core gene expression) and tissue\u2010specific responses (e.g., ovule formation and specialized gene expression) to shade, contributing to the developmental plasticity of Arabidopsis. Furthermore, they enhance our understanding of how external signals, indicative of vegetation proximity, can modulate seed production, a genetically determined process.\n                  <\/jats:p>","DOI":"10.1111\/ppl.70220","type":"journal-article","created":{"date-parts":[[2025,4,17]],"date-time":"2025-04-17T00:13:06Z","timestamp":1744848786000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":5,"title":["Plant proximity reduces seed yield in Arabidopsis plants by decreasing the number of ovule primordia"],"prefix":"10.1111","volume":"177","author":[{"ORCID":"https:\/\/orcid.org\/0000-0001-9124-0429","authenticated-orcid":false,"given":"Irma","family":"Roig\u2010Villanova","sequence":"first","affiliation":[{"name":"Centre for Research in Agricultural Genomics (CRAG), CSIC\u2010IRTA\u2010UAB\u2010UB Cerdanyola del Vall\u00e8s  Barcelona Spain"},{"name":"Serra H\u00fanter Fellow. Department of Agri\u2010Food Engineering and Biotechnology Barcelona School of Agri\u2010Food and Biosystems Engineering  Castelldefels Spain"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-9691-0786","authenticated-orcid":false,"given":"Salvador","family":"Torres\u2010Montilla","sequence":"additional","affiliation":[{"name":"Institute for Plant Molecular and Cell Biology (IBMCP) CSIC \u2010 Universitat Polit\u00e8cnica de Val\u00e8ncia  Val\u00e8ncia Spain"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-9068-4909","authenticated-orcid":false,"given":"Estefan\u00eda","family":"L\u00f3pez\u2010Ortiz","sequence":"additional","affiliation":[{"name":"Centre for Research in Agricultural Genomics (CRAG), CSIC\u2010IRTA\u2010UAB\u2010UB Cerdanyola del Vall\u00e8s  Barcelona Spain"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-9045-8370","authenticated-orcid":false,"given":"Maurizio","family":"Di Marzo","sequence":"additional","affiliation":[{"name":"Centre for Research in Agricultural Genomics (CRAG), CSIC\u2010IRTA\u2010UAB\u2010UB Cerdanyola del Vall\u00e8s  Barcelona Spain"},{"name":"Dipartimento di Bioscienze Universit\u00e0 degli Studi di Milano  Milan Italy"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0009-0006-8161-5710","authenticated-orcid":false,"given":"\u00c1ngela","family":"S\u00e1nchez\u2010Garc\u00eda","sequence":"additional","affiliation":[{"name":"Institute for Plant Molecular and Cell Biology (IBMCP) CSIC \u2010 Universitat Polit\u00e8cnica de Val\u00e8ncia  Val\u00e8ncia Spain"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-0361-2873","authenticated-orcid":false,"given":"Anna","family":"Esteve\u2010Codina","sequence":"additional","affiliation":[{"name":"Centro Nacional de An\u00e1lisis Gen\u00f3mico (CNAG) Barcelona, Spain, and Universitat de Barcelona (UB)  Barcelona Spain"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-4598-2664","authenticated-orcid":false,"given":"Aurelio","family":"G\u00f3mez\u2010Cadenas","sequence":"additional","affiliation":[{"name":"Departament de Biologia, Bioquimica i Ci\u00e8ncies Naturals Universitat Jaume I (UJI)  Castell\u00f3 de la Plana Spain"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-1516-0341","authenticated-orcid":false,"given":"Jaume F.","family":"Mart\u00ednez\u2010Garc\u00eda","sequence":"additional","affiliation":[{"name":"Centre for Research in Agricultural Genomics (CRAG), CSIC\u2010IRTA\u2010UAB\u2010UB Cerdanyola del Vall\u00e8s  Barcelona Spain"},{"name":"Institute for Plant Molecular and Cell Biology (IBMCP) CSIC \u2010 Universitat Polit\u00e8cnica de Val\u00e8ncia  Val\u00e8ncia Spain"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"311","published-online":{"date-parts":[[2025,4,16]]},"reference":[{"key":"e_1_2_8_2_1","doi-asserted-by":"publisher","DOI":"10.1073\/pnas.96.8.4710"},{"key":"e_1_2_8_3_1","doi-asserted-by":"publisher","DOI":"10.1199\/tab.0127"},{"key":"e_1_2_8_4_1","doi-asserted-by":"publisher","DOI":"10.1105\/tpc.15.00248"},{"key":"e_1_2_8_5_1","doi-asserted-by":"publisher","DOI":"10.1242\/dev.135202"},{"key":"e_1_2_8_6_1","doi-asserted-by":"publisher","DOI":"10.1111\/pce.12914"},{"key":"e_1_2_8_7_1","doi-asserted-by":"publisher","DOI":"10.1111\/j.1399-3054.1986.tb02463.x"},{"key":"e_1_2_8_8_1","doi-asserted-by":"publisher","DOI":"10.1093\/jxb\/err442"},{"key":"e_1_2_8_9_1","doi-asserted-by":"publisher","DOI":"10.1093\/jxb\/eru083"},{"issue":"1","key":"e_1_2_8_10_1","first-page":"37","article-title":"Genes directing flower development in Arabidopsis","volume":"1","author":"Bowman J. 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