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Glandular trichomes and laticifers in leaves of Ipomoea pes-caprae and I. imperati (Convolvulaceae) from coastal Restinga formation: structure and histochemistry

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Abstract

Glandular trichomes and laticifers occur in I. pes-caprae (L.) Stweet (Convolvulaceae) and I. imperati (Vahl) Griseb. However, the importance of their secretion for the species survival in “Restinga” environments had not yet been investigated. This study aimed to anatomically and histochemically characterize such secretory structures in the two species, indicating which type of laticifers they have and whether or not the trichomes secret saline solution. Moreover, knowing the composition of secretion can help to clarify the species strategies of survival under the stressful conditions in halophilous ecosystems. Leaf samples were used in light microscopy analyses. Both species have multicellular glandular trichomes on the leaf blade, and laticifers on the mesophyll and midrib. Trichome secretion is mucilaginous, but sodium was not detected, and therefore, such trichomes are not salt glands. Laticifers are typical and classified as articulated non-anastomosing, and are not covered by an epithelium, as reported in some studies. Mucilage secretion by the glandular trichomes can aid in the species survival in the “Restinga”. The species latex contains terpenoids and rubber, which may constitute important defenses against herbivores.

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Acknowledgments

The authors thank CAPES (Coordenação de Aperfeiçoamento de Pessoal de Nível Superior) for providing a M.Sc. scholarship to V. C. Kuster, and CNPq (Conselho Nacional de Desenvolvimento Científico e Tecnológico) for providing a research productivity scholarship to L.C. Silva (309480/2015–9), A. A. Azevedo, and R. M. S. A. Meira. The authors also thank the direction of Paulo César Vinha State Park for providing open access to it, and the “Laboratório de Anatomia Vegetal e Morfogênese In Vitro” of Universidade Federal de Viçosa.

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  1. Departamento de Biologia Vegetal, Universidade Federal de Viçosa (UFV), Av. P.H. Rolfs, s.n, Viçosa, Minas Gerais, 36570-900, Brazil

    Vinícius Coelho Kuster, Luzimar Campos da Silva, Renata Maria Strozi Alves Meira & Aristéa Alves Azevedo

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  1. Vinícius Coelho Kuster
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  2. Luzimar Campos da Silva
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Correspondence to Luzimar Campos da Silva.

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Kuster, V.C., da Silva, L.C., Meira, R.M.S.A. et al. Glandular trichomes and laticifers in leaves of Ipomoea pes-caprae and I. imperati (Convolvulaceae) from coastal Restinga formation: structure and histochemistry. Braz. J. Bot 39, 1117–1125 (2016). https://doi.org/10.1007/s40415-016-0308-5

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