Teresa Terrazas | Universidad Nacional Autónoma de México (original) (raw)

Papers by Teresa Terrazas

Anales del Instituto de Biología. UNAM. Serie botánica, 2003

Willdenowia, Mar 14, 2017

Acta Botanica Mexicana, Mar 30, 2023

Este es un artículo de acceso abierto bajo la licencia Creative Commons 4.0 Atribución-No Comerci... more Este es un artículo de acceso abierto bajo la licencia Creative Commons 4.0 Atribución-No Comercial (CC BY-NC 4.0 Internacional).

Brittonia

Resumen. El complejo Myriopteris lendigera se encuentra integrado por las especies: M. lendigera,... more Resumen. El complejo Myriopteris lendigera se encuentra integrado por las especies: M. lendigera, M. marsupianthes y M. mexicana, que se caracterizan por su gran variación morfológica, lo que complica establecer límites claros entre estos taxones. Por ello, el objetivo del presente trabajo fue analizar características morfológicas y anatómicas con la finalidad de definir su status taxonómico. Se midieron 30 características morfológicas y 12 anatómicas, tanto en ejemplares botánicos recolectados en campo (en cuatro entidades de la República Mexicana) como en especímenes provenientes de diez herbarios mexicanos. Con los datos obtenidos se estimaron estadísticos descriptivos y se realizaron diferentes análisis: de varianza, de agrupamiento (CA), de componentes principales (ACP) y discriminante (AD). Las características anatómicas no difirieron significativamente entre especies, pero las morfológicas sí. La longitud del pecíolo, ancho del pseudoindusio, longitud de la fronda y ancho de la segunda pinna, fueron las variables que permitieron diferenciar entre sí a las especies. El porcentaje de varianza explicada por los datos fue alto y se relacionó con los dos primeros componentes (65.99%) en el ACP o funciones discriminantes (100%) en el AD. Las distancias de Mahalonobis corroboraron que la variación en las características morfológicas fue significativa entre taxones. Con base en estos resultados, así como en la agrupación de los individuos en los diagramas de árbol y de ordenación, se sugiere que M. lendigera, M. marsupianthes y M. mexicana son especies válidas o entidades definidas, con caracteres morfológicos cualitativos y cuantitativos únicos, que permiten su identificación.

Lembaga Kimia Nasional - LIPI, 1984

Brazilian Journal of Botany, 2022

The Sapindales are a large order comprised of trees, shrubs, lianas and rarely herbs. This lineag... more The Sapindales are a large order comprised of trees, shrubs, lianas and rarely herbs. This lineage is mostly pantropical with important temperate lineages, inclusing some of the most diverse, highly prized woods in the world, such as mahogany ( Swietenia ). In this study, we characterized the wood anatomy across eight of the nine Sapindales families, and leverage phylogenetic comparative methods to explore the evolution of wood traits in the order. We delimited 23 characters and reconstructed them onto the most recent time-calibrated phylogeny for the group. We found that ring-porosity is derived within the order, coinciding with the occupation of more seasonal climates; marginal parenchyma is ancestrally present, but largely lost in Anacardiaceae-Burseraceae-Kirkiaceae; vessels in radial chains are ancestrally absent but gained many times; scanty paratracheal parenchyma was ancestrally present with multiple evolutions of more abundant parenchyma. Anacardiaceae-Burseraceae-Kirkiaceae share tyloses and large vessel-ray pits. Radial ducts are exclusive to Anacardiaceae-Burseraceae, while traumatic ducts are exclusive to Meliaceae-Rutaceae-Simaroubaceae. Rays are generally 2–4 cells wide, heterocellular, but with multiple lineages evolving homocellular narrow rays or more heterocellular wide rays. Prismatic crystals are commonly located in rays in Anacardiaceae-Burseraceae while in the other families they are mainly in axial parenchyma. Silica bodies are abundant in Burseraceae, but also present in Anacardiaceae and Meliaceae. Lianas are exclusively in Anacardiaceae and Sapindaceae, with Sapindaceae displaying an enormous diversity of cambial variants. Our work unravels several potential synapomorphies of Sapindales major clades, and evolutionary patterns for the enormous wood anatomical diversity of the order. In addition, our work highlights variable characters worth of more detailed studies within individual families of the Sapindales.

Sustainable Development and Biodiversity, 2019

Phylogenies based on molecular characters has dominated publications rather than those based on m... more Phylogenies based on molecular characters has dominated publications rather than those based on morphological characters. Some authors have defended the use of morphology in phylogenetic reconstruction. In Cactaceae few studies have been made combining molecular and morphological characters. A good example about the use of morphology in phylogenetic analysis has been addressed in Echinocereus. Echinocereus is a morphologically diverse genus including 67 species that have been grouped into eight taxonomic sections based on morphological traits. Previous molecular phylogenetic analyses did not show entirely the relationships in Echinocereus species, and did not provide useful characters to recognize clades. Therefore, we performed a combined phylogenetic analysis with a set of 44 morphological characters and six chloroplast DNA sequences. Topologies from parsimony and Bayesian analyses resulted mostly congruent. However, relationships of E. poselgeri did not agree between analyses. A ...

Tree Physiology, 2021

Plants from arid environments display covarying traits to survive or resist drought. Plant drough... more Plants from arid environments display covarying traits to survive or resist drought. Plant drought resistance and ability to survive long periods of low soil water availability should involve leaf phenology coordination with leaf and stem functional traits related to water status. This study tested correlations between phenology and functional traits involved in plant water status regulation in 10 Sonoran Desert tree species with contrasting phenology. Species seasonal variation in plant water status was defined by calculating their relative positions along the iso/anisohydric regulation continuum based on their hydroscape areas (HA)—a metric derived from the relationship between predawn and midday water potentials—and stomatal and hydraulic traits. Additionally, functional traits associated with plant water status regulation, including lamina vessel hydraulic diameter (DHL), stem-specific density (SSD) and leaf mass per area (LMA) were quantified per species. To characterize leaf p...

Journal of Arid Environments, 2020

The introduction of exotic buffelgrass (Pennisetum ciliare) to the Sonoran Desert has modified th... more The introduction of exotic buffelgrass (Pennisetum ciliare) to the Sonoran Desert has modified the structure and fuel loads of desert scrub, creating a continuous fuel bed and altering fire frequencies and intensities. The damage to native vegetation has been widely acknowledged, but the mechanisms underlying the response have been little studied. Considering bark as one of the important characteristics to protect stems from fire, this study aimed to compare bark traits of two native Sonoran desert trees (Bursera microphylla and Olneya tesota) that may promote cambium survival from fire. Physical features of trees and fuel that influence fire behavior were analyzed, and bark characteristics were examined, including anatomy and chemical composition, to determine how these properties may influence their survival to fire. Surprisingly, drought-resistant traits of Bursera microphylla, such as thicker inner bark and greater stem water reserves make this species better able to survive fires, providing up to ten times more resistance to heat inputs from buffelgrass. In contrast, Olneya tesota has a dry and narrow inner bark, a flammable outer bark, fuel material accumulation under its crown, and large branches close to the soil surface, characteristics that increase fire intensity and give less protection to stem live tissues.

Phytotaxa, 2018

The foliar architecture of 18 genera (Barkleyanthus, Digitacalia, Erechtites, Nelsonianthus, Pack... more The foliar architecture of 18 genera (Barkleyanthus, Digitacalia, Erechtites, Nelsonianthus, Packera, Pentacalia, Pippenalia, Pittocaulon, Psacaliopsis, Psacalium, Pseudogynoxys, Robinsonecio, Roldana, Senecio, Telanthophora, Tetradymia, Villasenoria and Werneria) of the tribe Senecioneae (Asteraceae) distributed in Mexico is described. The aim was to identify leaf characters to be used in the taxonomy and phylogenetics of the tribe, as well as a source to identify at the generic rank the genera distributed in Mexico. More than 400 specimens were revised and several leaves were cleared to analyze leaf venation patterns. Four patterns of primary venation (actinodromous suprabasal, paralelodromous, pinnate and radiate-palmate) and five patterns of secondary venation (brochidodromous, weak-brochidodromous, craspedodromous, mixed-craspedodromous and festooned-semi-craspedodromous) were identified. Terminal tracheids were observed only in veinlets of Pentacalia, Pseudogynoxys and Werneri...

Journal of Analytical and Applied Pyrolysis, 2020

This is a PDF file of an article that has undergone enhancements after acceptance, such as the ad... more This is a PDF file of an article that has undergone enhancements after acceptance, such as the addition of a cover page and metadata, and formatting for readability, but it is not yet the definitive version of record. This version will undergo additional copyediting, typesetting and review before it is published in its final form, but we are providing this version to give early visibility of the article. Please note that, during the production process, errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain.

Journal of Mountain Science, 2017

Change in environmental conditions with altitudinal gradients induces morpho-anatomical variation... more 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 of the 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.

IAWA Journal, 2003

Stress generation in Calamus merrillii Becc. -(Paper *) Growth stress development was investigate... more Stress generation in Calamus merrillii Becc. -(Paper *) Growth stress development was investigated in a monoeotyledons plant particularly rattan eanes (Calamus merrillii Beee.). Following the procedures used in trees, longitudinal eompressive stresses were observed at the peripheral region while longitudinal tensile stresses were deteeted at the eore. This oeeurrenee was attributed to the cell wall structure of rattan fibers. The fibers are polylamellated or are composed of several altemating broad and narrow layers. As a new layer is being deposited on the fiber lumen aecompanied by a large microfibril angle (MFA) (> 20°), it will cause fiber expansion. However, because of other cells adjacent to this particular fiber, such expansion will be prevented, thus, compressive stress will be generated within that fiber. The intensity of the stress varied from base to top and from periphery to core because of the variation in fiber proportion along these points. For this reason, longitudinal eompressive stress was higher at the base than at the top and very large at the peripheral region. As a response to this peripheral stress, longitudinal tensile stress was indueed at the eore. *) Not presented at the Portland meeting due to late cancellation .

Revista Brasileira de Botânica, May 15, 2024

Investigating water flow in the vascular system of plants is important to identify the water path... more Investigating water flow in the vascular system of plants is important to identify the water path and conduction capacity of different plant species, mainly in succulent species living in dry regions. This study aimed to standardize a method to track water flow in the xylem of Mammillaria bocasana and Echinocereus reichenbachii var. fitchii (Cactaceae) and test it under different drought conditions. The plants were kept under greenhouse conditions to perform the split root method, water flow tracing, and different drought treatments. The plants of each species were separated into three treatments: constant irrigation, drought with water and dye, and drought with dye. Plants were cut 24 h after staining, total and lumen diameters were taken, and the relative theoretical hydraulic conductivity was calculated. The absorption method was adequate for the tracing of water flow, and it worked in all the treatments of the drought experiment. Conducting elements, including wide-band tracheids, were stained violet and were located near the vascular cambium. In Mammillaria bocasana, half of the vascular cylinder was stained, while in Echinocereus reichenbachii var. fitchii, the entire cylinder was stained due to the cortical bundles. M. bocasana had a higher lumen diameter and relative theoretical hydraulic conductivity than E. reichenbachii var. fitchii. With the absorption staining method, the flow of water was traced, and differences in conduction under water stress conditions between the two species of cacti were detected. These results suggest that cacti species living under water stress solve the water movement in different ways.

Phytotaxa, Aug 21, 2023

Otatea is a Neotropical woody bamboo genus with thirteen described species. It is distributed fro... more Otatea is a Neotropical woody bamboo genus with thirteen described species. It is distributed from Mexico to Central America and northeastern Colombia. In Mexico, the archaeological evidence suggests that the culms of Otatea have been used for centuries by some ethnic groups. It is important to explore morphological and anatomical characters for species identification in woody bamboos as consequence of its monocarpic nature. Most studies on culm anatomy are centered on commercially used species describing their physical and mechanical properties. The aim of this work was to find culm anatomical characters with taxonomic value. To perform this, we collected internode samples from adult plants at mid culm of 15 specimens that represent 10 described species and two putative new species of Otatea. Our results include descriptions of culm anatomy at a cross section accompanied with images that detail all the structures measured and described. Additionally, we elaborate a key based on anatomical characters. This contribution is the first to explore culm anatomy of the genus Otatea in search for characters with taxonomic value, providing useful evidence for species identification, including samples from archaeological sites.

PLOS ONE

In tropical dry forests, studies on wood anatomical traits have concentrated mainly on variations... more In tropical dry forests, studies on wood anatomical traits have concentrated mainly on variations in vessel diameter and frequency. Recent research suggests that parenchyma and fibers also play an important role in water conduction and in xylem hydraulic safety. However, these relationships are not fully understood, and wood trait variation among different functional profiles as well as their variation under different water availability scenarios have been little studied. In this work, we aim to (1) characterize a set of wood anatomical traits among six selected tree species that represent the economic spectrum of tropical dry forests, (2) assess the variation in these traits under three different rainfall regimes, and (3) determine the relationships between wood anatomical traits and possible functional trade-offs. Differences among species and sites in wood traits were explored. Linear mixed models were fitted, and model comparison was performed. Most variation occurred among spec...