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Villarino GH, Hu Q, Manrique S, Flores-Vergara M, Sehra B, Robles L, Brumos J, Stepanova AN, Colombo L, Sundberg E, Heber S, Franks RG. Transcriptomic Signature of the SHATTERPROOF2 Expression Domain Reveals the Meristematic Nature of Arabidopsis Gynoecial Medial Domain. PLANT PHYSIOLOGY 2016; 171:42-61. [PMID: 26983993 PMCID: PMC4854683 DOI: 10.1104/pp.15.01845] [Citation(s) in RCA: 28] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/07/2015] [Accepted: 03/14/2016] [Indexed: 05/24/2023]
Abstract
Plant meristems, like animal stem cell niches, maintain a pool of multipotent, undifferentiated cells that divide and differentiate to give rise to organs. In Arabidopsis (Arabidopsis thaliana), the carpel margin meristem is a vital meristematic structure that generates ovules from the medial domain of the gynoecium, the female floral reproductive structure. The molecular mechanisms that specify this meristematic region and regulate its organogenic potential are poorly understood. Here, we present a novel approach to analyze the transcriptional signature of the medial domain of the Arabidopsis gynoecium, highlighting the developmental stages that immediately proceed ovule initiation, the earliest stages of seed development. Using a floral synchronization system and a SHATTERPROOF2 (SHP2) domain-specific reporter, paired with FACS and RNA sequencing, we assayed the transcriptome of the gynoecial medial domain with temporal and spatial precision. This analysis reveals a set of genes that are differentially expressed within the SHP2 expression domain, including genes that have been shown previously to function during the development of medial domain-derived structures, including the ovules, thus validating our approach. Global analyses of the transcriptomic data set indicate a similarity of the pSHP2-expressing cell population to previously characterized meristematic domains, further supporting the meristematic nature of this gynoecial tissue. Our method identifies additional genes including novel isoforms, cis-natural antisense transcripts, and a previously unrecognized member of the REPRODUCTIVE MERISTEM family of transcriptional regulators that are potential novel regulators of medial domain development. This data set provides genome-wide transcriptional insight into the development of the carpel margin meristem in Arabidopsis.
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Affiliation(s)
- Gonzalo H Villarino
- Department of Plant and Microbial Biology (G.H.V., M.F.-V., B.S., L.R., J.B., A.N.S., R.G.F.) and Department of Computer Science and Bioinformatics Research Center (Q.H., S.H.), North Carolina State University, Raleigh, North Carolina 27606;Università degli Studi di Milano Dip. di BioScienze, Sezione di Botanica Generale, Milan, Italy 20133 (S.M., L.C.); andDepartment of Plant Biology, Swedish University of Agricultural Sciences, Uppsala, Sweden 750 07 (E.S.)
| | - Qiwen Hu
- Department of Plant and Microbial Biology (G.H.V., M.F.-V., B.S., L.R., J.B., A.N.S., R.G.F.) and Department of Computer Science and Bioinformatics Research Center (Q.H., S.H.), North Carolina State University, Raleigh, North Carolina 27606;Università degli Studi di Milano Dip. di BioScienze, Sezione di Botanica Generale, Milan, Italy 20133 (S.M., L.C.); andDepartment of Plant Biology, Swedish University of Agricultural Sciences, Uppsala, Sweden 750 07 (E.S.)
| | - Silvia Manrique
- Department of Plant and Microbial Biology (G.H.V., M.F.-V., B.S., L.R., J.B., A.N.S., R.G.F.) and Department of Computer Science and Bioinformatics Research Center (Q.H., S.H.), North Carolina State University, Raleigh, North Carolina 27606;Università degli Studi di Milano Dip. di BioScienze, Sezione di Botanica Generale, Milan, Italy 20133 (S.M., L.C.); andDepartment of Plant Biology, Swedish University of Agricultural Sciences, Uppsala, Sweden 750 07 (E.S.)
| | - Miguel Flores-Vergara
- Department of Plant and Microbial Biology (G.H.V., M.F.-V., B.S., L.R., J.B., A.N.S., R.G.F.) and Department of Computer Science and Bioinformatics Research Center (Q.H., S.H.), North Carolina State University, Raleigh, North Carolina 27606;Università degli Studi di Milano Dip. di BioScienze, Sezione di Botanica Generale, Milan, Italy 20133 (S.M., L.C.); andDepartment of Plant Biology, Swedish University of Agricultural Sciences, Uppsala, Sweden 750 07 (E.S.)
| | - Bhupinder Sehra
- Department of Plant and Microbial Biology (G.H.V., M.F.-V., B.S., L.R., J.B., A.N.S., R.G.F.) and Department of Computer Science and Bioinformatics Research Center (Q.H., S.H.), North Carolina State University, Raleigh, North Carolina 27606;Università degli Studi di Milano Dip. di BioScienze, Sezione di Botanica Generale, Milan, Italy 20133 (S.M., L.C.); andDepartment of Plant Biology, Swedish University of Agricultural Sciences, Uppsala, Sweden 750 07 (E.S.)
| | - Linda Robles
- Department of Plant and Microbial Biology (G.H.V., M.F.-V., B.S., L.R., J.B., A.N.S., R.G.F.) and Department of Computer Science and Bioinformatics Research Center (Q.H., S.H.), North Carolina State University, Raleigh, North Carolina 27606;Università degli Studi di Milano Dip. di BioScienze, Sezione di Botanica Generale, Milan, Italy 20133 (S.M., L.C.); andDepartment of Plant Biology, Swedish University of Agricultural Sciences, Uppsala, Sweden 750 07 (E.S.)
| | - Javier Brumos
- Department of Plant and Microbial Biology (G.H.V., M.F.-V., B.S., L.R., J.B., A.N.S., R.G.F.) and Department of Computer Science and Bioinformatics Research Center (Q.H., S.H.), North Carolina State University, Raleigh, North Carolina 27606;Università degli Studi di Milano Dip. di BioScienze, Sezione di Botanica Generale, Milan, Italy 20133 (S.M., L.C.); andDepartment of Plant Biology, Swedish University of Agricultural Sciences, Uppsala, Sweden 750 07 (E.S.)
| | - Anna N Stepanova
- Department of Plant and Microbial Biology (G.H.V., M.F.-V., B.S., L.R., J.B., A.N.S., R.G.F.) and Department of Computer Science and Bioinformatics Research Center (Q.H., S.H.), North Carolina State University, Raleigh, North Carolina 27606;Università degli Studi di Milano Dip. di BioScienze, Sezione di Botanica Generale, Milan, Italy 20133 (S.M., L.C.); andDepartment of Plant Biology, Swedish University of Agricultural Sciences, Uppsala, Sweden 750 07 (E.S.)
| | - Lucia Colombo
- Department of Plant and Microbial Biology (G.H.V., M.F.-V., B.S., L.R., J.B., A.N.S., R.G.F.) and Department of Computer Science and Bioinformatics Research Center (Q.H., S.H.), North Carolina State University, Raleigh, North Carolina 27606;Università degli Studi di Milano Dip. di BioScienze, Sezione di Botanica Generale, Milan, Italy 20133 (S.M., L.C.); andDepartment of Plant Biology, Swedish University of Agricultural Sciences, Uppsala, Sweden 750 07 (E.S.)
| | - Eva Sundberg
- Department of Plant and Microbial Biology (G.H.V., M.F.-V., B.S., L.R., J.B., A.N.S., R.G.F.) and Department of Computer Science and Bioinformatics Research Center (Q.H., S.H.), North Carolina State University, Raleigh, North Carolina 27606;Università degli Studi di Milano Dip. di BioScienze, Sezione di Botanica Generale, Milan, Italy 20133 (S.M., L.C.); andDepartment of Plant Biology, Swedish University of Agricultural Sciences, Uppsala, Sweden 750 07 (E.S.)
| | - Steffen Heber
- Department of Plant and Microbial Biology (G.H.V., M.F.-V., B.S., L.R., J.B., A.N.S., R.G.F.) and Department of Computer Science and Bioinformatics Research Center (Q.H., S.H.), North Carolina State University, Raleigh, North Carolina 27606;Università degli Studi di Milano Dip. di BioScienze, Sezione di Botanica Generale, Milan, Italy 20133 (S.M., L.C.); andDepartment of Plant Biology, Swedish University of Agricultural Sciences, Uppsala, Sweden 750 07 (E.S.)
| | - Robert G Franks
- Department of Plant and Microbial Biology (G.H.V., M.F.-V., B.S., L.R., J.B., A.N.S., R.G.F.) and Department of Computer Science and Bioinformatics Research Center (Q.H., S.H.), North Carolina State University, Raleigh, North Carolina 27606;Università degli Studi di Milano Dip. di BioScienze, Sezione di Botanica Generale, Milan, Italy 20133 (S.M., L.C.); andDepartment of Plant Biology, Swedish University of Agricultural Sciences, Uppsala, Sweden 750 07 (E.S.)
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Lucero LE, Uberti-Manassero NG, Arce AL, Colombatti F, Alemano SG, Gonzalez DH. TCP15 modulates cytokinin and auxin responses during gynoecium development in Arabidopsis. THE PLANT JOURNAL : FOR CELL AND MOLECULAR BIOLOGY 2015; 84:267-82. [PMID: 26303297 DOI: 10.1111/tpj.12992] [Citation(s) in RCA: 72] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/30/2014] [Revised: 08/10/2015] [Accepted: 08/13/2015] [Indexed: 05/08/2023]
Abstract
We studied the role of Arabidopsis thaliana TCP15, a member of the TEOSINTE BRANCHED1-CYCLOIDEA-PCF (TCP) transcription factor family, in gynoecium development. Plants that express TCP15 from the 35S CaMV promoter (35S:TCP15) develop flowers with defects in carpel fusion and a reduced number of stigmatic papillae. In contrast, the expression of TCP15 fused to a repressor domain from its own promoter causes the development of outgrowths topped with stigmatic papillae from the replum. 35S:TCP15 plants show lower levels of the auxin indoleacetic acid and reduced expression of the auxin reporter DR5 and the auxin biosynthesis genes YUCCA1 and YUCCA4, suggesting that TCP15 is a repressor of auxin biosynthesis. Treatment of plants with cytokinin enhances the developmental effects of expressing TCP15 or its repressor form. In addition, treatment of a knock-out double mutant in TCP15 and the related gene TCP14 with cytokinin causes replum enlargement, increased development of outgrowths, and the induction of the auxin biosynthesis genes YUCCA1 and YUCCA4. A comparison of the phenotypes observed after cytokinin treatment of plants with altered expression levels of TCP15 and auxin biosynthesis genes suggests that TCP15 modulates gynoecium development by influencing auxin homeostasis. We propose that the correct development of the different tissues of the gynoecium requires a balance between auxin levels and cytokinin responses, and that TCP15 participates in a feedback loop that helps to adjust this balance.
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Affiliation(s)
- Leandro E Lucero
- Instituto de Agrobiotecnología del Litoral (CONICET-UNL), Cátedra de Biología Celular y Molecular, Facultad de Bioquímica y Ciencias Biológicas, Universidad Nacional del Litoral, 3000, Santa Fe, Argentina
| | - Nora G Uberti-Manassero
- Instituto de Agrobiotecnología del Litoral (CONICET-UNL), Cátedra de Biología Celular y Molecular, Facultad de Bioquímica y Ciencias Biológicas, Universidad Nacional del Litoral, 3000, Santa Fe, Argentina
| | - Agustín L Arce
- Instituto de Agrobiotecnología del Litoral (CONICET-UNL), Cátedra de Biología Celular y Molecular, Facultad de Bioquímica y Ciencias Biológicas, Universidad Nacional del Litoral, 3000, Santa Fe, Argentina
| | - Francisco Colombatti
- Instituto de Agrobiotecnología del Litoral (CONICET-UNL), Cátedra de Biología Celular y Molecular, Facultad de Bioquímica y Ciencias Biológicas, Universidad Nacional del Litoral, 3000, Santa Fe, Argentina
| | - Sergio G Alemano
- Laboratorio de Fisiología Vegetal, Universidad Nacional Río Cuarto, Campus Universitario, 5800, Río Cuarto, Argentina
| | - Daniel H Gonzalez
- Instituto de Agrobiotecnología del Litoral (CONICET-UNL), Cátedra de Biología Celular y Molecular, Facultad de Bioquímica y Ciencias Biológicas, Universidad Nacional del Litoral, 3000, Santa Fe, Argentina
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