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Anastomosing laticifer in the primary and secondary structures of Calotropis procera (Aiton) W.T.Aiton (Apocynaceae) stems

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Abstract

An in-depth understanding of the development and distribution of laticifer (latex secretory structure) will be important for the production of both rubber and medicines and will support studies on plant adaptations to their environments. We characterize here and describe the ontogenesis of the laticifer sytem in Calotropis procera (Apocynaceae), an invasive subshrub species in arid landscapes. Anatomical and histochemical evaluations of the primary and secondary structures of the stem were carried out on a monthly basis during a full year, with ultrastructural evaluations of laticifer on the stem apex during the rainy season. In the primary structure, laticifer differentiate early from procambium and ground meristem cells of the cortex and medulla and become concentrated adjacent to the external and internal phloem of the bicollateral bundles. In the secondary structure, laticifer differentiates from fusiform derivative cells of the phloem close to the sieve-tube elements. The laticifer is of the articulated, anastomosing, branched type, and it originates from precursor cells that loose the transversal and longitudinal walls by dissolution. Latex is a mixture of terpenes, alkaloids, flavonoids, mucilage, and proteins. The apical meristem and vascular cambium where the laticifer system begins its development are active throughout the year, including during the dry season. The vascular cambium produces phloem with laticifer precursor cells during the rainy season, with high temperatures and long days. The ability of C. procera to grow under water deficit conditions and produce laticifer throughout the year contribute to its wide distribution in arid environments.

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Acknowledgements

The authors acknowledge the Centro de Microscopia da Universidade Federal de Minas Gerais (CM/UFMG) for the ultrastructural analyses.

Funding

The authors thank the Fundação de Amparo à Pesquisa do Estado de Minas Gerais (FAPEMIG) (CRA-APQ-00468–15, CRA-PPM-00539–18, CRA-PPM-00544–18); the Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq) (441440/2016–9, 441583/2020–2 – Long-term Ecological Research Network—PELD-VERE; APQ—303806/2019–2) for funding and for the Research Productivity Grants awarded to MO Mercadante-Simões (423340/2018–2) and LM Ribeiro (308337/2021–2); and the Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES) (88887.601422/2021–00) for Master’s Scholarship awarded to BMC Salomé.

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MO Mercadante-Simões conceived and designed the research and performed the ultrastructural analyses. LM Ribeiro analyzed the quantitative data. BMCS and AFS performed the anatomical, histochemical, morphometric, and micromorphometric analyses. IFPA performed the field work. All authors contributed to writing the text.

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Correspondence to Maria Olívia Mercadante-Simões.

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The authors declare no competing interests.

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Handling Editor: Alexander Schulz.

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Salomé, B.M.C., Santos, A.F., Ribeiro, L.M. et al. Anastomosing laticifer in the primary and secondary structures of Calotropis procera (Aiton) W.T.Aiton (Apocynaceae) stems. Protoplasma 260, 497–508 (2023). https://doi.org/10.1007/s00709-022-01792-9

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  • DOI: https://doi.org/10.1007/s00709-022-01792-9

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