Foliar secretory structures in Crotoneae (Euphorbiaceae): Diversity, anatomy, and evolutionary significance

Vitarelli, Narah Costa; Riina, Ricarda; Caruzo, Maria Beatriz Rossi; Cordeiro, Inês; Aguilar, Javier Fuertes; Meira, Renata Maria Strozi Alves

doi:10.3732/ajb.1500017

Cited by 53 publications

(44 citation statements)

References 66 publications

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“…The diversity of types and different positions reported for colleters in Chamaecrista, both by us and other authors, emphasizes how important and poorly understood this structure is. Such data promise to be useful for both taxonomic and phylogenetic studies, as has been the case for other taxa (Lersten 1975;Curtis & Lersten 1980;Thomas 1991;González 1998;Simões et al 2006;González & Tarragó 2009;Sheue et al 2012;Silva et al 2012;Vitarelli et al 2015;Fernandes et al 2016). However, further studies are necessary to thoroughly evaluate the evolutionary history of colleters in Chamaecrista.…”

Section: Discussionmentioning

confidence: 99%

Colleters in Chamaecrista (L.) Moench sect. Chamaecrista and sect. Caliciopsis (Leguminosae-Caesalpinioideae): anatomy and taxonomic implications

et al. 2017

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Th e genus Chamaecrista contains ca. 330 species organized into six sections, of which section Chamaecrista is the second largest (ca.75 species) distributed among six series, while the section Caliciopsis contains only two species. Colleters have been described in the genus Chamaecrista and they show potential taxonomic and phylogenetic signifi cance. Th ey are associated with lubrication, desiccation prevention and protection from microbial attacks of young developing organs. Although six types of colleters have been described for the genus Chamaecrista, there have been no studies focusing on the diversity of colleters in the sections Chamaecrista and Caliciopsis. Samples from developing leaves and fl owers of both sections were obtained from herbarium and fi eld collections and subjected to standard methodologies for both light and scanning electron microscopy. Histochemical tests were also performed to determine the nature of the exudates. Five types of non-vascularized colleters were found: short digitiform, long digitiform, club-shaped, pyriform and short bottle-shaped. Polysaccharides, pectins, lipids and proteins were detected in the exudates of all types of colleters. Among the fi ve types of colleters observed, pyriform is a novelty for Chamaecrista, reinforcing the signifi cant morphological diversity of these secretory structures in this genus.

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Section: Discussionmentioning

confidence: 99%

Colleters in Chamaecrista (L.) Moench sect. Chamaecrista and sect. Caliciopsis (Leguminosae-Caesalpinioideae): anatomy and taxonomic implications

et al. 2017

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“…Standard type colleters have been described for other species of Malpighiales (Sheue, Chen & Yang, ; Vitarelli et al ., ). Colleter type and position have been used as taxonomic characters (Thomas, ; Klein et al ., ; Coutinho et al ., ; Silva et al ., ; Vitarelli et al ., ). The present study is the first record of colleters in Salicaceae and their taxonomic potential deserves to be investigated further.…”

Section: Discussionmentioning

confidence: 97%

“…The necessity of studying young leaves to identify marginal glands, as these structures could necrose or abscise, was reinforced by this author (Wilkinson, ). The presence of colleters on the leaf margin has already been recorded for 21 species of Croton L., Astraea lobata (L.) Klotzch and Brasiliocroton mamoninha P.E.Berry & Cordeiro (Euphorbiaceae, Vitarelli et al ., ), Croton echinocarpus Müll. Arg.…”

Section: Discussionmentioning

confidence: 99%

“…The presence of colleters in Malpighiales seems to be common, as they have been reported on the adaxial face of stipules (Paiva & Machado, ; Sheue et al ., ), the margin of leaf primordia and young leaves (Vitarelli et al ., ) and leaves and the base, margins and apex of stipules and in pistillate and staminate flowers (Feio et al ., ). The present work demonstrates the presence of colleters in 42 Casearia spp.…”

Section: Discussionmentioning

confidence: 99%

“…Colleters occur on the adaxial surface of young reproductive and (or) vegetative organs in several families of eudicots (Fahn, ; Thomas, ; Klein et al ., ; Martins, ; Coelho et al ., ; Dalvi et al ., ; Lopes‐Mattos et al ., ) and only Orchidaceae among monocots (Leitão & Cortelazzo, ; Mayer et al ., ). Recently, colleters have also been reported at the leaf margins for some species (Paiva, ; Mercadante‐Simões & Paiva, ; Vitarelli et al ., ; Feio, Riina & Meira, ). Therefore, anatomical studies and histochemical tests of Casearia are necessary to identify the type of gland that is associated with the teeth and to determine the chemical composition of the secretion, respectively.…”

Section: Introductionmentioning

confidence: 98%

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Colleters inCasearia(Salicaceae): a new interpretation for the theoid teeth

et al. 2016

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Salicaceae possess a range of leaf teeth types, many characterized as nectariferous salicoid or violoid teeth. One large genus, Casearia, deviates from this generalization in having theoid teeth. Although taxonomic descriptions of Casearia have included reports of glands at the apex of teeth, there have been no descriptions of their anatomy or functional role. Here, we aim to describe the anatomy of the theoid teeth of 43 Casearia spp. Leaf samples from herbarium specimens were processed for light and scanning electron microscopy. Leaves of C. sylvestris were collected and fixed in the field for histochemical tests, revealing only polysaccharides in secretory epidermal cells and outside of these cells. The glands have precocious development and are composed of a non-vascular central axis covered with a palisade-like secretory epidermis. During senescence, the cells of the palisade-like secretory epidermis and central axis appear to lose their typical form, with some cell walls disintegrating. In the mature leaf, an abscission zone at the base of the gland causes detachment of the gland. The placement, anatomical structure, precocious activity and polysaccharide secretion (in C. sylvestris) allow the recognition of the glands associated with the marginal teeth in Casearia as colleters. Similar studies are needed for other genera in order to clarify how colleters have evolved in Salicaceae and how they are functionally and anatomically related to other teeth types in the family.

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Leaf anatomy of two medicinal Croton species: Contribution to plant recognition

Rosa

Ferraro

Silva

et al. 2021

Microscopy Res & Technique

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Croton L. (Euphorbiaceae) is the second largest genus of the Euphorbiaceae s.l. family, which is composed of about 1,200 taxa. Several species are widely used medicinally in various parts of the world to treat cancer, digestive problems, skin diseases, malaria, ulcers, and obesity. The leaves and stems are sold as dehydrated fragments, or in powder form, and used in the preparation of teas and various types of formulations. The aim of this study was to accurately characterize the leaf anatomy of Croton bonplandianus Baill. and Croton gracilipes Baill. and to perform histochemical analysis of laticifers to provide subsidies for botanical certification. To accomplish this, leaf blade and petiole samples were fixed and prepared following standard techniques for scanning electron and light microscopy. Histochemical tests were carried out on sections to detect the compounds present in the secretions. Results showed neutral and acidic lipids, as well as phenolic compounds, in the latex. In addition, leaf anatomical structures of these two species were studied for specific identification of morphological characters and for quality assessment of these medicinal plants.

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Foliar secretory structures in Crotoneae (Euphorbiaceae): Diversity, anatomy, and evolutionary significance

Abstract: This study revealed a high diversity of secretory structures, including novel ones, in one of the largest clades of Euphorbiaceae. Our results are promising for investigations on the anatomical and ecophysiological bases of species diversification within Euphorbiaceae.

Cited by 53 publications

References 66 publications

Colleters in Chamaecrista (L.) Moench sect. Chamaecrista and sect. Caliciopsis (Leguminosae-Caesalpinioideae): anatomy and taxonomic implications

Colleters in Chamaecrista (L.) Moench sect. Chamaecrista and sect. Caliciopsis (Leguminosae-Caesalpinioideae): anatomy and taxonomic implications

Colleters inCasearia(Salicaceae): a new interpretation for the theoid teeth

Leaf anatomy of two medicinal Croton species: Contribution to plant recognition

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