Mariana Rojas-Aréchiga

Mariana Rojas-Aréchiga
Universidad Nacional Autónoma de México | UNAM · Department of Ecology of Biodiversity

PhD

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25
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Publications

Publications (25)
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Environmental factors are used by plants as spatio-temporal indicators of favorable conditions for seed germination. Thus, the objective of this study was to determine the effect of light and temperature on seed germination of 30 taxa of Cactaceae occurring in northeastern Brazil and to evaluate whether fluctuations in temperature are capable of al...
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The response of seed germination towards light and the relationship to seed traits has been studied particularly well in tropical forests. Several authors have shown a clear adaptive response of seed size and photoblastism, however, the evolutionary significance of this relationship for species inhabiting arid environments has not been fully unders...
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We determined the effect of three concentrations of gibberellic acid on germination and photoblastic behavior of five species of Opuntioideae from the Mapimi Biosphere Reserve, southern Chihuahuan Desert, Durango, Mexico. For Cylindropuntia imbricata, addition of high concentrations (1,500 ppm) of gibberellic acid gave a 30% germination similar to...
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The effects of constant and alternating temperatures on seed germination in the Cactaceae have been reported to vary, probably as a result of the different temperature regimes used and the species considered. We determined the cardinal temperatures for, and evaluated the effects of a wide range of constant and alternating temperatures on, seed germ...
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Resumen *Abstract see below. Echinomastus unguispinus es una cactácea globosa que se distribuye en el Desierto Chihuahuense y se encuentra en la categoría de protección especial según la nom-ECOL-2001. En este estudio se determinaron las características morfológicas de las semillas y se realizaron pruebas de germinación. Las semillas son de tamaño...
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In this study, we investigated the effect of light regimen (white light vs. darkness) on the germination of 12 species of the Echinopsis genus (tribe Trichocereeae, Cactaceae). This genus presents a variety of growth forms and relatively small and uniform seed size. These traits allowed us to test, within the same linage and removing seed mass effe...
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In the present study, we assessed the seed germination responses of Cereus jamacaru DC. ssp. jamacaru (Cactaceae) to environmental factors. The seeds were collected from an area within Caatinga, a semiarid vegetation area located in north-eastern Brazil. We determined the optimal temperature for germination of C. jamacaru seeds and evaluated the ef...
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La germinación de 4 especies del género Mammillaria (Cactaceae) del Valle de Tehuacán-Cuicatlán, México, se comparó en 4 tratamientos: luz roja, roja lejana, blanca y oscuridad a 25°C y en luz blanca y oscuridad a 2 temperaturas alternantes (15/30°C y 20/35°C). Las semillas resultaron ser fotoblásticas positivas, aunque germinaron en rojo lejano. P...
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Seed dormancy and seed longevity partially determine the crucial stages of germination and establishment of seedlings for rare Cactaceae in arid environments. We studied the effect of seed age and seed dormancy on germination and seedling establishment of an endangered species of cactus (Mammillaria huitzilopochtli) from Oaxaca, Mexico, in controll...
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El peyote es una cactácea con propiedades alucinógenas, utilizada desde tiempos remotos con fines medicinales, terapéuticos y visionarios. Ha sido punto de interés tanto para diversas disciplinas científicas como para artistas y escritores. Debido principalmente a una presión de sobrecolecta, se encuentra bajo la NOM-059-ECOL-2001 como sujeta a pro...
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In this paper, we evaluated the effect of light and temperature and addition of gibberellic acid (GA3) in the germination of seeds of Trichocereus terscheckii in order to provide information about germination requirements which could be use for conservation studies. The germination response within a temperature gradient was evaluated for seeds aris...
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Abstract In this paper, we investigated if germination of after-ripened seeds of Opuntia rastrera Weber could be enhanced,using chemical,(acid) and mechanical,scarification pretreatments. O. rastrera seeds need,an,after-ripening period,to germinate,(E50%) after 1 year and,no germination,occurs,in younger,seeds. Germination,of 3-year old seeds of O....
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Abstract In the Tehuacán-Cuicatlán Valley in the state of Puebla and Oaxaca, four populations of Ferocactus robustus (Pfeiff.) Britton & Rose show risk factors to their conservation. This species is not actually considered in any risk category in the Norma Oficial Mexicana (NOM-059-Semarnat-2001). The geographical distribution of this species, as w...
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Germination rate and percentage, and seed weight were compared among wild and cultivated populations of the columnar cactus Stenocereus stellatus to analyse the effect of domestication on their seed behaviour and dormancy mechanisms. Experiments on germination capacity were tested on constant (25°C) and fluctuating temperature (20/35°C; 18/6 h) und...
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The present review tries to give a general overview of the available information on cactus seed germination. First, information about the family Cactaceae is discussed, concerning aspects such as distribution and general characteristics. Seed distinctive features are mentioned, such as colour, form, and size. Aspects of seed physiology, such as ger...
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The effect of seven different constant temperatures and five ranges of alternating temperatures on seed germination of seven species of cacti from Puebla, Mxico was analyzed. Six cacti species germinated in a wide range of temperature. Columnar cacti were more tolerant to low temperatures and germinated in a wider range of temperature than barrel c...
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Seed germination of seven species of cacti from Zapotitlán Valley, Puebla, Mexico, were compared at four different light treatments (red light, far-red light, white light and darkness) at a constant temperature of 25°C, and at two light treatments (white light and darkness) at two fluctuating temperatures (15–30°C and 20–30°C). Results allowed us t...
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The major components of annual seed deposition in the rain forest at Los Tuxtlas, Veracruz, México are seeds of the pioneer tree species Cecropia obtusifolia and those of some species of Ficus. Cecropia obtusifolia Bertol. forms a relatively persistent viable soil seed bank, whereas seeds of Ficus are seldom found in the soil. Both genera require l...