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Plant Sci."],"abstract":"<jats:p>Arabinogalactan proteins (AGPs) are hydroxyproline-rich glycoproteins containing a high proportion of carbohydrates, widely distributed in the plant kingdom and ubiquitously present in land plants. AGPs have long been suggested to play important roles in plant reproduction and there is already evidence that specific glycoproteins are essential for male and female gametophyte development, pollen tube growth and guidance, and successful fertilization. However, the functions of many of these proteins have yet to be uncovered, mainly due to the difficulty to study individual AGPs. In this work, we generated molecular tools to analyze the expression patterns of a subgroup of individual AGPs in different Arabidopsis tissues, focusing on reproductive processes. This study focused on six AGPs: four classical AGPs (AGP7, AGP25, AGP26, AGP27), one AG peptide (AGP24) and one chimeric AGP (AGP31). These AGPs were first selected based on their predicted expression patterns along the reproductive tissues from available RNA-seq data. Promoter analysis using \u03b2-glucuronidase fusions and qPCR in different Arabidopsis tissues allowed to confirm these predictions. <jats:italic>AGP7<\/jats:italic> was mainly expressed in female reproductive tissues, more precisely in the style, funiculus, and integuments near the micropyle region. <jats:italic>AGP25<\/jats:italic> was found to be expressed in the style, septum and ovules with higher expression in the chalaza and funiculus tissues. <jats:italic>AGP26<\/jats:italic> was present in the ovules and pistil valves. <jats:italic>AGP27<\/jats:italic> was expressed in the transmitting tissue, septum and funiculus during seed development. <jats:italic>AGP24<\/jats:italic> was expressed in pollen grains, in mature embryo sacs, with highest expression at the chalazal pole and in the micropyle. <jats:italic>AGP31<\/jats:italic> was expressed in the mature embryo sac with highest expression at the chalaza and, occasionally, in the micropyle. For all these AGPs a co-expression analysis was performed providing new hints on its possible functions. This work confirmed the detection in Arabidopsis male and female tissues of six AGPs never studied before regarding the reproductive process. These results provide novel evidence on the possible involvement of specific AGPs in plant reproduction, as strong candidates to participate in pollen-pistil interactions in an active way, which is significant for this field of study.<\/jats:p>","DOI":"10.3389\/fpls.2022.1083098","type":"journal-article","created":{"date-parts":[[2022,12,2]],"date-time":"2022-12-02T07:45:28Z","timestamp":1669967128000},"update-policy":"https:\/\/doi.org\/10.3389\/crossmark-policy","source":"Crossref","is-referenced-by-count":8,"title":["New insights on the expression patterns of specific Arabinogalactan proteins in reproductive tissues of Arabidopsis thaliana"],"prefix":"10.3389","volume":"13","author":[{"given":"Diana","family":"Moreira","sequence":"first","affiliation":[]},{"given":"Ana L\u00facia","family":"Lopes","sequence":"additional","affiliation":[]},{"given":"Jessy","family":"Silva","sequence":"additional","affiliation":[]},{"given":"Maria Jo\u00e3o","family":"Ferreira","sequence":"additional","affiliation":[]},{"given":"Sara Cristina","family":"Pinto","sequence":"additional","affiliation":[]},{"given":"Sara","family":"Mendes","sequence":"additional","affiliation":[]},{"given":"Lu\u00eds Gustavo","family":"Pereira","sequence":"additional","affiliation":[]},{"given":"S\u00edlvia","family":"Coimbra","sequence":"additional","affiliation":[]},{"given":"Ana Marta","family":"Pereira","sequence":"additional","affiliation":[]}],"member":"1965","published-online":{"date-parts":[[2022,12,2]]},"reference":[{"key":"B1","doi-asserted-by":"publisher","first-page":"2614","DOI":"10.1105\/tpc.104.024588","article-title":"A classical arabinogalactan protein is essential for the initiation of female gametogenesis in arabidopsis","volume":"16","author":"Acosta-Garc\u00eda","year":"2004","journal-title":"Plant Cell"},{"key":"B2","doi-asserted-by":"publisher","first-page":"314","DOI":"10.1111\/j.1365-313X.2009.03956.x","article-title":"Plasma membrane-associated proline-rich extensin-like receptor kinase 4, a novel regulator of Ca 2+ signalling, is required for abscisic acid responses in Arabidopsis thaliana","volume":"60","author":"Bai","year":"2009","journal-title":"Plant J."},{"key":"B3","doi-asserted-by":"publisher","first-page":"10132","DOI":"10.1074\/jbc.M112.432609","article-title":"Functional identification of a hydroxyproline-o-galactosyltransferase specific for arabinogalactan protein biosynthesis in arabidopsis","volume":"288","author":"Basu","year":"2013","journal-title":"J. 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