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  • 1
    Online Resource
    Online Resource
    Los jardines botánicos y la crisis de la biodiversidad
    Botanical Sciences, Sociedad Botanica de Mexico, AC ; 2013
    In:  Botanical Sciences Vol. 91, No. 3 ( 2013-09-15), p. 239-250
    Details
    In: Botanical Sciences, Botanical Sciences, Sociedad Botanica de Mexico, AC, Vol. 91, No. 3 ( 2013-09-15), p. 239-250
    Abstract: Históricamente, los jardines botánicos se enfocaban sobre especies con interés económico, y no había mención alguna de la conservación hasta mediados del siglo XX. La destrucción de las selvas y bosques, pérdida de biodiversidad y el cambio climático son problemas reales y los jardines botánicos modernos desarrollaron estrategias para enfrentarlos; la conservación ex situ e in situ , y una alianza de jardines botánicos para la restauración ecológica. Los jardines botánicos cumplieron ocho de las 16 metas de la Estrategia Global para la Conservación Vegetal, entre ellas, la capacitación de horticultores, que aun hace falta impulsar en México. Se debe fomentar la horticultura a todos niveles, especialmente en la restauración. Los jardines botánicos modernos están repletos de conocimiento sobre la diversidad vegetal, y su acervo de especímenes documentados, respaldados en los herbarios, se utiliza para la sistemática molecular moderna entre otras disciplinas taxonómicamente más tradicionales. Son centros principales para la conservación y han tenido éxito en la educación ambiental. Gracias a las redes nacionales e internacionales, la localización de especies es posible y el concepto de Colecciones Nacionales fue adoptado por jardines botánicos mexicanos. La médula de los jardines botánicos es la calidad de sus bases de datos e información; es urgente reforzar lo anterior entre los jardines de México, incluso utilizar la tecnología del microchip que hace el control de ejemplares más eficiente. Hoy más que nunca, la sociedad necesita el apoyo de los expertos en los jardines botánicos, así como potenciar los mismos como lugares de esparcimiento y tranquilidad.
    Type of Medium: Online Resource
    ISSN: 2007-4476 , 2007-4298
    URL: Article
    DOI: 10.17129/botsci.5
    Language: Unknown
    Publisher: Botanical Sciences, Sociedad Botanica de Mexico, AC
    Publication Date: 2013
    detail.hit.zdb_id: 2679053-1
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  • 2
    Online Resource
    Online Resource
    G-fibers and Florin ring-like structures in Dioon (Zamiaceae)
    Botanical Sciences, Sociedad Botanica de Mexico, AC ; 2016
    In:  Botanical Sciences Vol. 94, No. 2 ( 2016-06-10), p. 263-268
    Details
    In: Botanical Sciences, Botanical Sciences, Sociedad Botanica de Mexico, AC, Vol. 94, No. 2 ( 2016-06-10), p. 263-268
    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.
    Type of Medium: Online Resource
    ISSN: 2007-4476 , 2007-4298
    URL: Article
    DOI: 10.17129/botsci.274
    Language: Unknown
    Publisher: Botanical Sciences, Sociedad Botanica de Mexico, AC
    Publication Date: 2016
    detail.hit.zdb_id: 2679053-1
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  • 3
    Online Resource
    Online Resource
    El uso ceremonial de la cícada amenazada "espadaña" ( Dioon merolae , Zamiaceae) por una comunidad de la depresión central de Chiapas, México
    Botanical Sciences, Sociedad Botanica de Mexico, AC ; 2006
    In:  Botanical Sciences , No. 78 ( 2006-06-15), p. 107-113
    Details
    In: Botanical Sciences, Botanical Sciences, Sociedad Botanica de Mexico, AC, , No. 78 ( 2006-06-15), p. 107-113
    Abstract: Dioon merolae De Luca, Sabato et Vázq.Torres, una especie de cícada de Chiapas conocida localmente como espadaña, juega un papel importante durante la festividad de la Santa Cruz del 3 de mayo entre la comunidad de Suchiapa de la Depresión Central del estado de Chiapas. Aparentemente ésta es una tradición nativa chiapaneca de origen prehispánico que se sincretizó con la religión católica durante la época colonial. Sus hojas se usan para adornar altares cada mayo durante esta festividad religiosa Católica. Las cícadas no parecen sufrir daño alguno por la poda anual de las hojas, pero la amenaza actual a las poblaciones y a esta tradición milenaria viene de activistas de otras tradiciones religiosas que provocan incendios al hábitat de la cícada durante el período del estiaje antes de la cosecha de las hojas.
    Type of Medium: Online Resource
    ISSN: 2007-4476 , 2007-4298
    URL: Article
    DOI: 10.17129/botsci.1724
    Language: Unknown
    Publisher: Botanical Sciences, Sociedad Botanica de Mexico, AC
    Publication Date: 2006
    detail.hit.zdb_id: 2679053-1
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  • 4
    Online Resource
    Online Resource
    Pollen morphology of the Megamexican cycads reveals the potential of morphometrics to identify cycad genera
    Botanical Sciences, Sociedad Botanica de Mexico, AC ; 2020
    In:  Botanical Sciences Vol. 99, No. 1 ( 2020-11-01), p. 182-197
    Details
    In: Botanical Sciences, Botanical Sciences, Sociedad Botanica de Mexico, AC, Vol. 99, No. 1 ( 2020-11-01), p. 182-197
    Abstract: Background: Although pollen morphology has always been an important tool in plant systematics, the possibility of distinguishing between related taxa is still debated. A difficult case is the cycads, where their morphology and small size is very similar. Pollen morphology has been important in plant systematics and determination at the species level is possible depending on the group. Controversial cases are the cycads, where their small pollen and smooth sculpture when observed under light microscopy present few useful characters for separation at the species level. Question: Will cycad pollen morphometry be useful to distinguish taxa? Study species: 15 species within the genera Ceratozamia, Dioon and Zamia were investigated with five species of each genus. Methods: Pollen was obtained from both live specimens from the Clavijero Botanic Garden of the Instituto de Ecología, A.C., as well as herbarium specimens. Acetolyzed pollen was used for descriptions and morphometry, and non-acetolyzed pollen for SEM images. Results: The thickness of the exine and pollen sculpture of Dioon differed from that of Ceratozamia and Zamia thus allowing its identification. The pollen morphology of Ceratozamia and Zamia is very similar and therefore difficult to distinguish between species. Conclusions: The thicker exine of Dioon allows its pollen to be distinguished from the other two genera. Morphometric methods must be applied to distinguish pollen between species of Ceratozamia and Zamia.
    Type of Medium: Online Resource
    ISSN: 2007-4476 , 2007-4298
    URL: Article
    DOI: 10.17129/botsci.2696
    Language: Unknown
    Publisher: Botanical Sciences, Sociedad Botanica de Mexico, AC
    Publication Date: 2020
    detail.hit.zdb_id: 2679053-1
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  • 5
    Online Resource
    Online Resource
    Validation of the name Zamia elegantissima Schutzaman, Vovides et Adams
    Botanical Sciences, Sociedad Botanica de Mexico, AC ; 2004
    In:  Botanical Sciences , No. 74 ( 2004-06-15), p. 97-97
    Details
    In: Botanical Sciences, Botanical Sciences, Sociedad Botanica de Mexico, AC, , No. 74 ( 2004-06-15), p. 97-97
    Abstract: -
    Type of Medium: Online Resource
    ISSN: 2007-4476 , 2007-4298
    URL: Article
    DOI: 10.17129/botsci.1688
    Language: Unknown
    Publisher: Botanical Sciences, Sociedad Botanica de Mexico, AC
    Publication Date: 2004
    detail.hit.zdb_id: 2679053-1
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  • 6
    Online Resource
    Online Resource
    Impact of Late Pleistocene-Holocene climatic fluctuations on the phylogeographic structure and historical demographics of Zamia prasina (Cycadales: Zamiaceae)
    Botanical Sciences, Sociedad Botanica de Mexico, AC ; 2019
    In:  Botanical Sciences Vol. 97, No. 4 ( 2019-12-19), p. 588-608
    Details
    In: Botanical Sciences, Botanical Sciences, Sociedad Botanica de Mexico, AC, Vol. 97, No. 4 ( 2019-12-19), p. 588-608
    Abstract: Background: Glacial periods during the Pleistocene have been hypothesized to have greatly influenced geographical patterns of genetic structure and demography of many tropical species. The Glacial Refugium Hypothesis proposes that, during cold, dry glacial periods, populations of moisture-affinities tropical species were restricted to sheltered, humid areas and that, during warmer and more humid interglacial periods, these populations expanded. Some mountain regions in the tropics acted as refugia during the cold, dry periods of the Pleistocene for several temperate forest taxa, which recolonized the humid areas farther north during the interglacial periods. Questions: (1) Did Late Pleistocene-Holocene climate changes affect the historical demophraphy of Zamia prasina ? (2) Does the historical distribution of Zamia prasina agree with the Glacial Refugium Hypothesis? Study species: Zamia prasina W.Bull. (Zamiaceae), the only cycad native to the Yucatan Peninsula Biotic Province (YPBP). Methods: Five individuals were collected in 23 populations and characterized using two DNA regions: plastid atpF-atpH , and nuclear ITS2. Genetic diversity, phylogeographic structure, historical demography, and potential distributions were assessed.  Results: Our results showed moderately high genetic diversity and low, but significant, phylogeographic structure. Two genetic groups were identified, one in the eastern part of the Peninsula, the other in the western. The changes in historical demography suggest that Z. prasina experienced a population expansion following the warm conditions of the Holocene. Conclusions: The population dynamics of Zamia prasina are in accordance with the Glacial Refugium Hypothesis.
    Type of Medium: Online Resource
    ISSN: 2007-4476 , 2007-4298
    URL: Article
    DOI: 10.17129/botsci.2195
    Language: Unknown
    Publisher: Botanical Sciences, Sociedad Botanica de Mexico, AC
    Publication Date: 2019
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  • 7
    Online Resource
    Online Resource
    What is Ceratozamia mexicana (Zamiaceae)?
    Botanical Sciences, Sociedad Botanica de Mexico, AC ; 2016
    In:  Botanical Sciences Vol. 94, No. 2 ( 2016-06-10), p. 419-429
    Details
    In: Botanical Sciences, Botanical Sciences, Sociedad Botanica de Mexico, AC, Vol. 94, No. 2 ( 2016-06-10), p. 419-429
    Abstract: Explorations in central Veracruz on the Transvolcanic Mexican Belt and regions explored by 19th century botanists we found various populations of Ceratozamia whose taxonomic status is not yet completely clear. Especially two populations of C. mexicana with distinct morphology; one population at El Esquilón considered as C. mexicana by Chamberlain and other authors, and another population at El Mirador that Stevenson found a voucher at the herbarium in Paris with oblanceolate leaflets collected by Ghiesbrecht and designated it as Brongniart’s holotype. The plants from El Mirador are comparable to the holotype of C. mexicana , but those at El Esquilón do not. Stevenson later also found a voucher at Kew by Thiselton-Dyer as C. mexicana var. tenuis from Mexico with linear-lanceolate leaflets that is similar to the plants at the El Esquilón population. An analysis of 11 leaflet anatomical characters gave a significant discriminant pattern (Wilk’s lambda 0.00015 P 〈 0.01). The squared Mahalanobis distances were also significant ( P 〈 0.05) and the first canonic variable showed that 93.4 % of the variation was due to the anatomical characters. A new nomenclatural combination is proposed and Thiselton-Dyer’s voucher assigned as the lectotype of Ceratozamia tenuis . Epitypes were also designated for the two species in support of the anatomical analysis as well as a description for both species given.
    Type of Medium: Online Resource
    ISSN: 2007-4476 , 2007-4298
    URL: Article
    DOI: 10.17129/botsci.449
    Language: Unknown
    Publisher: Botanical Sciences, Sociedad Botanica de Mexico, AC
    Publication Date: 2016
    detail.hit.zdb_id: 2679053-1
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  • 8
    Online Resource
    Online Resource
    Cronología reproductora de Ceratozamia mexicana (Cycadales)
    Botanical Sciences, Sociedad Botanica de Mexico, AC ; 2000
    In:  Botanical Sciences , No. 66 ( 2000-06-15), p. 15-23
    Details
    In: Botanical Sciences, Botanical Sciences, Sociedad Botanica de Mexico, AC, , No. 66 ( 2000-06-15), p. 15-23
    Abstract: En Cemtozamia mexicana Brongn. el desarrollo de la semilla se cumple en 24 meses desde la iniciación de los óvulos en agosto hasta el desarrollo completo del cuerpo del embrión. Durante los tres primeros meses ocurre la megasporogénesis y la megagametofitogénesis. Al finalizar febrero el gametofito es cenocítico. La celularización del gametofito termina en mayo y comienzan otros cambios: endurecimiento del gametofito, lignificación de la capa pétrea, desaparición de tricomas y acumulación de almidón en el gametofito. La polinización probablemente ocurre entre febrero y marzo. Al inicio de septiembre, aparecen proteínas y gotas de aceite en el gametofito. La semilla se dispersa en septiembre; puede presentar arquegonios y ocasionalmente suspensores en desarrollo. La fertilización ocurre aproximadamente en el período de la dispersión fuera de la planta madre. Los suspenso res crecen durante cinco meses y el cuerpo del embrión se desarrolla en cuatro meses. Previo a la presencia de un embrión, esta semilla se dedica a proveerse de nutrimentos y protegerse.
    Type of Medium: Online Resource
    ISSN: 2007-4476 , 2007-4298
    URL: Article
    DOI: 10.17129/botsci.1607
    Language: Unknown
    Publisher: Botanical Sciences, Sociedad Botanica de Mexico, AC
    Publication Date: 2000
    detail.hit.zdb_id: 2679053-1
    SSG: 7,36
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