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      G-fibers and Florin ring-like structures in Dioon (Zamiaceae) Translated title: Fibras-G y estructuras de anillo tipo Florin en Dioon (Zamiaceae)

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          Abstract

          Abstract Cuticle information and epidermal characters have great potential in systematic studies. However, micromorphology and anatomical studies on cycads are relatively scarce in comparison to similar studies on other gymnosperms. In this study leaflet anatomy and cuticles in the genus Dioon have been investigated with bright field microscopy, epifluorescence, and scanning electron microscopy. Structures hitherto not completely studied for the genus are reported such as lignified hypodermis, girder sclerenchyma, especially G-fibers, and Florin ring-like structures associated with the stomatal apparatus.

          Translated abstract

          Resumen La información de cutículas y caracteres epidérmicas tienen gran potencial para estudios sistemáticos. Sin embargo, la micromorfología y estudios anatómicos en las cícadas son relativamente escasos en comparación de estudios similares con otras gimnospermas. En este estudio se investigó la anatomía de foliolos y cutículas del género Dioon con técnicas de microscopia de campo claro, epifluorescencia y de microscopía electrónica de barrido y se reportan estructuras no completamente estudiadas antes para el género. Se observó hipodermis lignificada, presencia de esclerénquima de trabe y particularmente fibras gelatinosas y estructuras semejantes a anillos de Florin asociados con los aparatos estomáticos.

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          Most cited references21

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          Cuticular studies as an aid to plant taxonomy

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            The Araucariaceae: An evolutionary perspective

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              Immunocytochemical characterization of tension wood: Gelatinous fibers contain more than just cellulose.

              Gelatinous fibers (G-fibers) are the active component of tension wood. G-fibers are unlike traditional fiber cells in that they possess a thick, nonlignified gelatinous layer (G-layer) internal to the normal secondary cell wall layers. For the past several decades, the G-layer has generally been presumed to be composed nearly entirely of crystalline cellulose, although several reports have appeared that disagreed with this hypothesis. In this report, immunocytochemical techniques were used to investigate the polysaccharide composition of G-fibers in sweetgum (Liquidambar styraciflua; Hamamelidaceae) and hackberry (Celtis occidentalis; Ulmaceae) tension wood. Surprisingly, a number of antibodies that recognize arabinogalactan proteins and RG I-type pectin molecules bound to the G-layer. Because AGPs and pectic mucilages are found in other plant tissues where swelling reactions occur, we propose that these polymers may be the source of the contractile forces that act on the cellulose microfibrils to provide the tension force necessary to bend the tree trunk.
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                Author and article information

                Contributors
                Role: ND
                Role: ND
                Journal
                bs
                Botanical Sciences
                Bot. sci
                Sociedad Botánica de México A.C. (México, DF, Mexico )
                2007-4298
                2007-4476
                June 2016
                : 94
                : 2
                : 263-268
                Affiliations
                [1] Xalapa Veracruz orgnameInstituto de Ecología Mexico
                Article
                S2007-42982016000200263
                10.17129/botsci.274
                70fceb6e-42c2-4bba-8afe-96fe616136fd

                This work is licensed under a Creative Commons Attribution-NonCommercial 4.0 International License.

                History
                : 09 October 2014
                : 02 March 2015
                Page count
                Figures: 0, Tables: 0, Equations: 0, References: 26, Pages: 6
                Product

                SciELO Mexico


                leaflets,Cycadales,cycads,cuticles,anatomy,cutícula,anatomía de foliolos,cícadas

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