Foliar micromorphology of Mexican oaks (Quercus: Fagaceae)
Mexico is the main center of diversity of the genus Quercus in the Western Hemisphere. Despite recent advances in the knowledge of Mexican oaks, a degree of taxonomic confusion still remains, mainly within particular species complexes. In this study, scanning electron microscopy was used to describe...
| Main Authors: | , , , |
|---|---|
| Format: | Online |
| Language: | spa |
| Published: |
Instituto de Ecología, A.C.
2013
|
| Online Access: | https://abm.ojs.inecol.mx/index.php/abm/article/view/56 |
| _version_ | 1799771101340893184 |
|---|---|
| author | Scareli-Santos, Claudia L., María González-Rodríguez, Antonio Oyama, Ken |
| author_facet | Scareli-Santos, Claudia L., María González-Rodríguez, Antonio Oyama, Ken |
| author_sort | Scareli-Santos, Claudia |
| collection | ABM |
| description | Mexico is the main center of diversity of the genus Quercus in the Western Hemisphere. Despite recent advances in the knowledge of Mexican oaks, a degree of taxonomic confusion still remains, mainly within particular species complexes. In this study, scanning electron microscopy was used to describe micromorphological foliar structures (trichomes, epicuticular waxes and stomata) from the abaxial and adaxial leaf surfaces of Mexican oak species, with the main goal of assessing the taxonomical utility of these characters. In total, 27 species belonging to sections Quercus (white oaks) and Lobatae (red/black oaks) were examined, particularly focusing on several groups of closely related species with problematic taxonomic delimitation and on species that are known to hybridize. Several trichome types were observed, including both glandular (simple and bulbous) and eglandular (solitary, multiradiate, stellate, fused stellate and fasciculate stipitate). Epicuticular waxes were structured as films, grooved films, crusts, granules, platelets and platelets arranged in rosettes. Stomata were elliptical and raised above or leveled with the foliar surface. Among the three types of structures examined, trichomes appeared to be the most useful for taxonomical purposes, followed by epicuticular waxes. All species had different combinations of character states for these micromorphological structures, which permitted the elaboration of keys to identify species within the problematic groups. |
| format | Online |
| id | oai:oai.abm.ojs.inecol.mx:article-56 |
| institution | Acta Botanica Mexicana |
| language | spa |
| publishDate | 2013 |
| publisher | Instituto de Ecología, A.C. |
| record_format | ojs |
| spelling | oai:oai.abm.ojs.inecol.mx:article-562023-02-14T01:20:34Z Foliar micromorphology of Mexican oaks (Quercus: Fagaceae) Micromorfología foliar del género Quercus (Fagaceae) en México Scareli-Santos, Claudia L., María González-Rodríguez, Antonio Oyama, Ken epicuticular waxes foliar trichomes Quercus stomata taxonomy ceras epicuticulares estomas Quercus taxonomía tricomas foliares Mexico is the main center of diversity of the genus Quercus in the Western Hemisphere. Despite recent advances in the knowledge of Mexican oaks, a degree of taxonomic confusion still remains, mainly within particular species complexes. In this study, scanning electron microscopy was used to describe micromorphological foliar structures (trichomes, epicuticular waxes and stomata) from the abaxial and adaxial leaf surfaces of Mexican oak species, with the main goal of assessing the taxonomical utility of these characters. In total, 27 species belonging to sections Quercus (white oaks) and Lobatae (red/black oaks) were examined, particularly focusing on several groups of closely related species with problematic taxonomic delimitation and on species that are known to hybridize. Several trichome types were observed, including both glandular (simple and bulbous) and eglandular (solitary, multiradiate, stellate, fused stellate and fasciculate stipitate). Epicuticular waxes were structured as films, grooved films, crusts, granules, platelets and platelets arranged in rosettes. Stomata were elliptical and raised above or leveled with the foliar surface. Among the three types of structures examined, trichomes appeared to be the most useful for taxonomical purposes, followed by epicuticular waxes. All species had different combinations of character states for these micromorphological structures, which permitted the elaboration of keys to identify species within the problematic groups. México es el principal centro de diversidad del género Quercus en el Hemisferio Occidental. A pesar de los avances recientes en el conocimiento de los encinos mexicanos, aún existe cierto grado de confusión taxonómica, particularmente dentro de algunos complejos de especies. En este estudio se utilizó microscopía electrónica de barrido para describir las estructuras micromorfológicas foliares (tricomas, ceras epicuticulares y estomas) de ambas superficies foliares (haz y envés) en representantes seleccionados de encinos mexicanos, con el objetivo de evaluar la utilidad taxonómica de estos caracteres. En total se examinaron 27 especies, pertenecientes a las secciones Quercus (encinos blancos) y Lobatae (encinos rojos y negros), incluyendo varios grupos de plantas cercanamente relacionadas con problemas de delimitación taxonómica, así como especies que presentan hibridación. Se encontraron varios tipos de tricomas, tanto los de tipo glandular (simples y bulbosos) como los no glandulares (solitarios, multirradiados, estrellados, estrellados fusionados y fasciculado estipitados). Las ceras epicuticulares se observaron en forma de capas, capas fisuradas, costras, gránulos, placas y placas en rosetas. Los estomas fueron elípticos y se encontraron elevados con respecto a la superficie foliar o al mismo nivel que ésta. Entre los tres tipos de estructuras examinadas, los tricomas fueron los más útiles para propósitos taxonómicos, seguidos por las ceras epicuticulares. Todas las especies tuvieron diferentes combinaciones de estados de carácter para estas estructuras micromorfológicas, lo que permitió la elaboración de claves para identificar a las especies dentro de los grupos problemáticos. Instituto de Ecología, A.C. 2013-07-01 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion artículo evaluado por pares application/pdf text/html https://abm.ojs.inecol.mx/index.php/abm/article/view/56 10.21829/abm104.2013.56 Acta Botanica Mexicana; No. 104 (2013); 31-52 Acta Botanica Mexicana; Núm. 104 (2013); 31-52 2448-7589 0187-7151 spa https://abm.ojs.inecol.mx/index.php/abm/article/view/56/106 https://abm.ojs.inecol.mx/index.php/abm/article/view/56/107 Derechos de autor 2015 Acta Botánica Mexicana https://creativecommons.org/licenses/by-nc/4.0 |
| spellingShingle | Scareli-Santos, Claudia L., María González-Rodríguez, Antonio Oyama, Ken Foliar micromorphology of Mexican oaks (Quercus: Fagaceae) |
| title | Foliar micromorphology of Mexican oaks (Quercus: Fagaceae) |
| title_full | Foliar micromorphology of Mexican oaks (Quercus: Fagaceae) |
| title_fullStr | Foliar micromorphology of Mexican oaks (Quercus: Fagaceae) |
| title_full_unstemmed | Foliar micromorphology of Mexican oaks (Quercus: Fagaceae) |
| title_short | Foliar micromorphology of Mexican oaks (Quercus: Fagaceae) |
| title_sort | foliar micromorphology of mexican oaks (quercus: fagaceae) |
| url | https://abm.ojs.inecol.mx/index.php/abm/article/view/56 |
| work_keys_str_mv | AT scarelisantosclaudia foliarmicromorphologyofmexicanoaksquercusfagaceae AT lmaria foliarmicromorphologyofmexicanoaksquercusfagaceae AT gonzalezrodriguezantonio foliarmicromorphologyofmexicanoaksquercusfagaceae AT oyamaken foliarmicromorphologyofmexicanoaksquercusfagaceae AT scarelisantosclaudia micromorfologiafoliardelgeneroquercusfagaceaeenmexico AT lmaria micromorfologiafoliardelgeneroquercusfagaceaeenmexico AT gonzalezrodriguezantonio micromorfologiafoliardelgeneroquercusfagaceaeenmexico AT oyamaken micromorfologiafoliardelgeneroquercusfagaceaeenmexico |
