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24. GUNNERACEAE

Author

Mora-Osejo, Luis Eduardo, Pabón-Mora, Natalia, and González, Favio

Published
2011

37. Especies neotropicales de Aristolochia (Aristolochiaceae) en la obra de N. J. Jacquin: Taxonomía, tipificación y primeros apuntes etnobotánicos.

Author

González, Favio and Pabón-Mora, Natalia

Subjects
SALAMANDERS, ANTIVENINS, NATIVE Americans, ARISTOLOCHIA, SPECIES
Abstract

Copyright of Boletín Científico Centro de Museos de Historia Natural is the property of Universidad de Caldas and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Published
2024
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44. Comparative morphoanatomy and transcriptomic analyses reveal key factors controlling floral trichome development in Aristolochia (Aristolochiaceae)

Author

Departamento Administrativo de Ciencia, Tecnología e Innovación (Colombia), Universidad de Antioquia, Suárez-Baron, Harold, Alzate, Juan F., Ambrose, Barbara A., Pelaz, Soraya, González, Favio, Pabón-Mora, Natalia, Departamento Administrativo de Ciencia, Tecnología e Innovación (Colombia), Universidad de Antioquia, Suárez-Baron, Harold, Alzate, Juan F., Ambrose, Barbara A., Pelaz, Soraya, González, Favio, and Pabón-Mora, Natalia

Abstract

Trichomes are specialized epidermal cells in aerial plant parts. Trichome development proceeds in three stages, determination of cell fate, specification, and morphogenesis. Most genes responsible for these processes have been identified in the unicellular branched leaf trichomes from the model Arabidopsis thaliana. Less is known about the molecular basis of multicellular trichome formation across flowering plants, especially those formed in floral organs of early diverging angiosperms. Here, we aim to identify the genetic regulatory network (GRN) underlying multicellular trichome development in the kettle-shaped trap flowers of Aristolochia (Aristolochiaceae). We selected two taxa for comparison, A. fimbriata, with trichomes inside the perianth, which play critical roles in pollination, and A. macrophylla, lacking specialized trichomes in the perianth. A detailed morphoanatomical characterization of floral epidermis is presented for the two species. We compared transcriptomic profiling at two different developmental stages in the different perianth portions (limb, tube, and utricle) of the two species. Moreover, we present a comprehensive expression map for positive regulators and repressors of trichome development, as well as cell cycle regulators. Our data point to extensive modifications in gene composition, expression, and putative roles in all functional categories when compared with model species. We also record novel differentially expressed genes (DEGs) linked to epidermis patterning and trichome development. We thus propose the first hypothetical genetic regulatory network (GRN) underlying floral multicellular trichome development in Aristolochia, and pinpoint key factors responsible for the presence and specialization of floral trichomes in phylogenetically distant species of the genus.

Published
2023

49. Nephopterisout of the clouds: Molecular evidence places the enigmatic N. maxonii(Pteridaceae) within the Jamesoniaclade

Author

Pabón-Mora, Natalia and González, Favio

Abstract

The monospecific fern genus Nephopterisis restricted to four páramos in Colombia. Until now, its phylogenetic relationships have not been clarified, although morphological traits suggest that it belongs to the taenitidoid clade of the subfamily Pteridoideae in the Pteridaceae. We isolated four chloroplast (atpA, chlL, rbcL, and rps4) loci of N. maxoniiand performed maximum parsimony and maximum likelihood phylogenetic analyses, including a preliminary analysis based on rbcL of 424 accessions of leptosporangiate ferns. Then, we carried out separate and combined reconstructions for all four loci, focusing the sampling in the subfamily Pteridoideae (Pteridaceae). Our results show that Nephopterisbelongs to the taenitidoid clade of the subfamily Pteridoideae and is nested in Jamesonia. Thus, the new combination Jamesonia maxoniiis provided. Its dimorphic sterile and fertile leaves appear to be unique within the taenitidoids. Given that this species shares the same microhabitat with other Jamesoniaspecies, it is unlikely that leaf shape evolution within the entire clade is a result of adaptive processes to páramo conditions. El género monoespecífico de helechos Nephopterisestá restringido a cuatro páramos de Colombia. Hasta ahora, las relaciones filogenéticas del género no han sido precisadas, aunque los caracteres morfológicos sugieren que pertenece a la subfamilia Pteridoideae, de las Pteridaceae. Cuatro loci del cloroplasto (atpA, chlL, rbcL, and rps4) de N. maxoniifueron aislados y empleados para reconstruir la filogenia bajo Parsimonia y Máxima Verosimilitud, incluído un análisis preliminar basado en secuencias de rbcL de 424 muestras de helechos leptosporangiados. Enseguida, llevamos a cabo análisis separados para los cuatro loci, enfocando el muestreo en la subfamilia Pteridoideae (Pteridaceae). Nuestros resultados demuestran que Nephopterispertenece al clado taenitidoide de la subfamilia Pteridoideae, anidado dentro de Jamesonia. Por lo tanto, proponemos la nueva combinación, Jamesonia maxonii. Las hojas dimórficas de J. maxoniison únicas dentro del clado de helechos taenitidoides. Debido a que esta especie crece en los mismos microhabitat junto a otras especies de Jamesonia, es improbable que la evolución foliar en el clado Jamesoniasea el resultado de procesos adaptativos frente a condiciones de páramo.

Published
2024
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