Results 151 to 160 of about 1,228 (178)
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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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Seedling performance in a trioecious cactus,Pachycereus pringlei: Effects of maternity and paternity
Plant Systematics and Evolution, 1999We studied seed germination and the growth and survivorship of seedlings of females and hermaphrodites ofPachycereus pringlei (cardon), a Mexican columnar cactus whose geographically variable breeding system includes trioecy and gynodioecy. Results of a two-year field experiment conducted near Bahia Kino, Sonora, Mexico and a ten-month laboratory ...
Vinicio J. Sosa, Theodore H. Fleming
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Evolutionary Ecology, 1998
The Sonoran Desert columnar cactus Pachycereus pringlei has a geographically variable, non-hermaphroditic breeding system. It is trioecious (separate males, females and hermaphrodites) in the northern two-thirds of its range in Sonora, Mexico, and in the southern three-quarters of its range in Baja California, Mexico, and is gynodioecious (separate ...
Fleming, Theodore H +2 more
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The Sonoran Desert columnar cactus Pachycereus pringlei has a geographically variable, non-hermaphroditic breeding system. It is trioecious (separate males, females and hermaphrodites) in the northern two-thirds of its range in Sonora, Mexico, and in the southern three-quarters of its range in Baja California, Mexico, and is gynodioecious (separate ...
Fleming, Theodore H +2 more
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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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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
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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
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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
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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
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Plant Ecology, 2006
Understanding the mechanisms that determine the distribution and abundance of plants is a major problem in ecology. However, very few studies have explored the factors controlling the abundance of columnar cacti throughout their range of distribution.
Alfonso Medel-Narvaez +3 more
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Understanding the mechanisms that determine the distribution and abundance of plants is a major problem in ecology. However, very few studies have explored the factors controlling the abundance of columnar cacti throughout their range of distribution.
Alfonso Medel-Narvaez +3 more
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Journal of Arid Environments, 2008
Abstract The abundance of microorganisms in desert soil environments is closely related to the accumulation of resources around individual plants, called “islands of fertility”. This research was undertaken (1) to study the formation of islands of fertility in soils under Prosopis laevigata and Pachycereus hollianus in a preserved terrace and a ...
T.G. Ruiz, S.R. Zaragoza, R.F. Cerrato
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Abstract The abundance of microorganisms in desert soil environments is closely related to the accumulation of resources around individual plants, called “islands of fertility”. This research was undertaken (1) to study the formation of islands of fertility in soils under Prosopis laevigata and Pachycereus hollianus in a preserved terrace and a ...
T.G. Ruiz, S.R. Zaragoza, R.F. Cerrato
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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
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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
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