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      Interconnected idioblasts in Peltaea polymorpha: a novel component of the mucilage-secretory apparatus in Malvaceae

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          Abstract

          The anatomical and cytological characteristics of the mucilage-secretory system have been widely studied in Malvaceae. However, conflicting information regarding the morphological nature of secretory structures exists, and some remain poorly understood. In this sense, some secretory structures in Malvaceae are not characterized as typical isolated idioblasts, canals, or cavities. Here, we describe a novel component of the mucilage-secretory apparatus in the Malvaceae family. Samples of the shoot apex, mature stem and fully expanded leaves were obtained from adult Peltaea polymorpha, which grow in the Cerrado (Brazilian savanna). The samples were processed using standard light and transmission electron microscopy methods. Mucilage cells occurred in the cortex and pith of petioles and stems, and in the midrib of leaves. These cells originate early in the stem apex from successive divisions of cells of the fundamental meristem, resulting in a row of interconnected secretory cells enveloped by a sheath of parenchyma cells devoid of secretory activity. Mucilage is stored in both protoplast and apoplast. In the same row, some cells filled with mucilage become very swollen and compress the neighbouring idioblasts that become flattened. This phenomenon results in a sandwich panel structure consisting of the swollen transversal walls of adjacent cells. As the differentiation progresses, the transversal walls of the rowed mucilage cells became very swollen, multilayered, and porous. Cytoplasmic strands cross such transversal walls connecting rowed cells. Mucilage-secreting cells in P. polymorpha are interconnected idioblasts and represent a novel component of the mucilage-secretory apparatus in Malvaceae. These findings open new avenues for understanding the structure and dynamics of mucilage-secreting cells from a functional perspective.

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                Author and article information

                Contributors
                Role: Associate Editor
                Journal
                AoB Plants
                AoB Plants
                aobpla
                AoB Plants
                Oxford University Press (US )
                2041-2851
                January 2025
                10 January 2025
                10 January 2025
                : 17
                : 1
                : plae063
                Affiliations
                Department of Biodiversity and Biostatistics, Institute of Biosciences of Botucatu, São Paulo State University (UNESP) , Professor Antônio Celso Wagner Zagnin street, 250, District of Rubião Júnior, 18618-970, Botucatu City, São Paulo State, Brazil
                Interunit Postgraduate Program in Plant Biology, Institute of Biosciences of Botucatu and Rio Claro, São Paulo State University (UNESP) , Brazil
                Department of Biodiversity and Biostatistics, Institute of Biosciences of Botucatu, São Paulo State University (UNESP) , Professor Antônio Celso Wagner Zagnin street, 250, District of Rubião Júnior, 18618-970, Botucatu City, São Paulo State, Brazil
                Interunit Postgraduate Program in Plant Biology, Institute of Biosciences of Botucatu and Rio Claro, São Paulo State University (UNESP) , Brazil
                Interunit Postgraduate Program in Plant Biology, Institute of Biosciences of Botucatu and Rio Claro, São Paulo State University (UNESP) , Brazil
                Department of Biodiversity and Biostatistics, Institute of Biosciences of Botucatu, São Paulo State University (UNESP) , Professor Antônio Celso Wagner Zagnin street, 250, District of Rubião Júnior, 18618-970, Botucatu City, São Paulo State, Brazil
                Interunit Postgraduate Program in Plant Biology, Institute of Biosciences of Botucatu and Rio Claro, São Paulo State University (UNESP) , Brazil
                Author notes
                Corresponding author’s e-mail address: tatiane.rodrigues@ 123456unesp.br
                Article
                plae063
                10.1093/aobpla/plae063
                11773387
                39876986
                20ed69d8-710e-4ccd-90ee-7abe3b2f2021
                © The Author(s) 2025. Published by Oxford University Press on behalf of the Annals of Botany Company.

                This is an Open Access article distributed under the terms of the Creative Commons Attribution License ( https://creativecommons.org/licenses/by/4.0/), which permits unrestricted reuse, distribution, and reproduction in any medium, provided the original work is properly cited.

                History
                : 17 July 2024
                : 25 November 2024
                : 09 November 2024
                : 28 January 2025
                Page count
                Pages: 9
                Funding
                Funded by: São Paulo Research Foundation—FAPESP;
                Award ID: 2021/13392-0
                Award ID: 312900/2021-0
                Award ID: 308982/2020-7
                Funded by: National Council for Scientific and Technological Development (CNPq);
                Award ID: 140744/2019-3
                Award ID: 140386/2023-8
                Funded by: CNPq/PROPe UNESP;
                Funded by: Coordenação de Aperfeiçoamento de Pessoal de Nível Superior—CAPES, Brazil;
                Award ID: 001
                Categories
                Studies
                AcademicSubjects/SCI01210
                Editor's Choice

                Plant science & Botany
                interconnected secretory cells,mucilage secretion, peltaea polymorpha (a. st.-hill) krapov. & cristóbal,rowed idioblasts,transversal walls

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