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Anatomical variation of five plant species along an elevation gradient in Mexico City basin within the Trans-Mexican Volcanic Belt, Mexico

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Journal of Mountain Science 2017年第11期14卷 2182-2199页

作者： P Mayte S.JIMéNEZ-NORIEGA teresa terrazas Lauro LóPEZ-MATA Arturo SáNCHEZ-GONZáLEZ Heike VIBRANS Department of Botany Postgraduate College at Campus Montecillo Institute of Biology Autonomous National University of Mexico Center of Biological Research Autonomous University of State of Hidalgo Mineral de la Reforma

Change in environmental conditions with altitudinal gradients induces morpho-anatomical variations in plants that have been poorly documented in intertropical regions. Five species with three life forms, cryptophyte(Alchemilla procumbens, Geranium seemannii), hemicryptophyte(Acaena elongata, Lupinus montanus), and phanerophyte(Symphoricarpos microphyllus), distributed along an altitudinal gradient in the Sierra Nevada of central Mexico, were studied. The aims were to identify and evaluate their morpho-anatomical modifications under the hypothesis that the sizes of individuals and of their wood and leaf cell types decrease as elevation increases. Three individuals per species per site were collected at seven locations along the altitudinal gradient(2949-3952 m). Their morpho-anatomical characters were analyzed through multiple regression analyses. Elevation was the variable that best explained anatomical changes in the leaf and wood ofthe five species. Canopy density and potassium content in the soil also contributed to explain the variation in anatomical variables along the gradient. As elevation increased a bimodal pattern was observed in various anatomical characters as in the leaf width of A. elongata, A. procumbens and G. seemannii and in the vessel diameter of A. procumbens, G. seemannii, and L. montanus. Other features as the vessel diameter of A. elongata, the fiber length of S. microphyllus, and the ray width of A. elongata increased as the elevation increased. Anatomical traits have a tendency to decrease in size but just toward the end of the gradient, which is probably related to changes in canopy density. The plant response to the altitudinal gradient is more focused on anatomical adaptations than morphological variation; it is also species dependent.

关键词： Altitude Foliar anatomy Mount Tlaloc Wood anatomy Alchemilla procumbens Geraniumseemannii Cryptophyte Bimodal pattern

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Ab Initio Study of Aluminum-Phosphorus Co-doped Graphene

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Journal of Physical Science and Application 2017年第1期7卷 1-7页

作者： Victor Eduardo Comparan Padilla Maria teresa Romero de la Cruz Carlos Eduardo Rodriguez Garcia ReyesGarcia Diaz Gregorio Hernandez Cocoletzi Facultad de Ciencias Quimicas Universidad Autonoma de Coahuila Blvd. Venustiano Carranza C.P. 25280 Saltillo CoahuilaMexico Facultada de Ciencias Fisico Matematica Universidad Autonoma de Coahuila Blvd. Venustiano Carranza C.P. 25280 SaltilloCoahuila Mexico Instituto de Fisica Luis Rivera terrazas Benemerita Universidad Autonoma de Puebla Av. San Claudio y Blvd. 18 Sur C.P.72570 Puebla Puebla Mexico

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