Results 171 to 180 of about 1,583 (196)
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Perspectives in Plant Ecology, Evolution and Systematics, 2016
Abstract Mating systems and long-term climatic fluctuations have large impact on genetic diversity and population structure of plants; however, the genetic consequences have been poorly documented in species with geographic variation in mating systems. Here we used genetic variation from microsatellite markers to investigate the biogeographic pattern
Carina Gutiérrez-Flores +3 more
semanticscholar +2 more sources
Abstract Mating systems and long-term climatic fluctuations have large impact on genetic diversity and population structure of plants; however, the genetic consequences have been poorly documented in species with geographic variation in mating systems. Here we used genetic variation from microsatellite markers to investigate the biogeographic pattern
Carina Gutiérrez-Flores +3 more
semanticscholar +2 more sources
Wood biomechanics and anatomy of PACHYCEREUS PRINGLEI
American Journal of Botany, 2000We report the longitudinal, biomechanical, and anatomical trends observed for tissue samples drawn from the parallel aligned, prismatic woody vascular bundles running the length of a Pachycereus pringlei plant measuring 5.22 m in height. The main vertical stem of this plant was cut into five segments (labeled A through E in the acropetal direction ...
K J, Niklas +3 more
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The biomechanics of Pachycereus pringlei root systems
American Journal of Botany, 2002We report on the root system of the large columnar cactus species Pachycereus pringlei to explore the hypothesis that increasing plant size decreases the ability to resist wind‐throw but increases the capacity to absorb and store nutrients in roots (i.e., plant size limits the performance of these functions and may shift the performance of one function
Karl J, Niklas +3 more
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Seed morphology and variation in the genus Pachycereus (Cactaceae)
Journal of Plant Research, 2004Seeds of 13 Pachycereus species and two Stenocereus species that have been suggested as closely related were examined with the scanning electron microscope. Quantitative features were evaluated using multivariate analysis in order to identify characters that distinguish them.
Salvador, Arias, Teresa, Terrazas
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Environmental Entomology, 2014 The positive relationship between productivity and species diversity is well-known. Insect communities associated with the flowers of Cactaceae species represent an interesting system to explore the productivity-diversity relationship because branches facing the equator receive more photosynthetically active radiation and have higher productivity. Thus,
D. M. Figueroa‐Castro +3 more
semanticscholar +4 more sources
Tetrahydroisoquinoline alkaloids of the Mexican columnar cactus Pachycereus Weberi
Phytochemistry, 1980Abstract Eight tetrahydroisoquinoline alkaloids have been crystallized and identified from the nonphenolic and phenolic extracts of the giant Mexican cereoid cactus, Pachycereus weberi (Coult.) Br. and R. The identities were established as 5,6,7-trimethoxy-1,2,3,4- tetrahydroisoquinoline (nortehuanine) 1; 7,8-dimethoxy-1,2,3,4-tetrahydroisoquinoline (
Rachel Mata, Jerry L. MeLaughlin
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Flora, 2017
Abstract Studies on breeding systems and flower morphology are valuable to infer how environmental factors impose evolutionary change in plants. This study focused on the characterization of floral morphs and reproductive systems in Pachycereus pringlei and how this iconic columnar cactus might be a useful genus to understand the evolution of these
Carina Gutiérrez-Flores +3 more
semanticscholar +2 more sources
Abstract Studies on breeding systems and flower morphology are valuable to infer how environmental factors impose evolutionary change in plants. This study focused on the characterization of floral morphs and reproductive systems in Pachycereus pringlei and how this iconic columnar cactus might be a useful genus to understand the evolution of these
Carina Gutiérrez-Flores +3 more
semanticscholar +2 more sources
Análisis cladístico del género Pachycereus (Cactaceae) con caracteres morfológicos
Brittonia, 2006Abstract The genus Pachycereus is restricted to Guatemala, Mexico, and the SW United States and includes 13 species according to the most recent classification. A phylogenetic analysis was conducted in order to test the monophyly of Pachycereus with respect to other genera of subtribe Pachycereinae.
Salvador Arias, Teresa Terrazas
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Journal of Arid Environments, 2011
Abstract Few studies have determined the importance of orientation on flower reproductive success. Flower orientation may affect reproduction of Cactaceae; the interception of photosynthetic active radiation (PAR) differs along the different sides of cacti stems, and translocation of resources between cacti ribs does not appear to occur.
D. M. Figueroa‐Castro, P. L. Valverde
semanticscholar +2 more sources
Abstract Few studies have determined the importance of orientation on flower reproductive success. Flower orientation may affect reproduction of Cactaceae; the interception of photosynthetic active radiation (PAR) differs along the different sides of cacti stems, and translocation of resources between cacti ribs does not appear to occur.
D. M. Figueroa‐Castro, P. L. Valverde
semanticscholar +2 more sources
Pollination biology of the columnar cactus Pachycereus pecten-aboriginum in north-western México
Journal of Arid Environments, 2004Columnar cacti in tropical deserts depend on nectar-feeding bats for their reproduction while species from extra-tropical deserts show a relatively generalized pollination system with both nocturnal and diurnal pollinators. Pachycereus pecten-aboriginum is a columnar cactus with a broad distribution along the Pacific coast of Mexico, from Oaxaca to ...
Francisco Molina-Freaner +3 more
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