Ceratozamia microstrobila is described from southeastern San Luis Potosí, Mexico. It is compared ... more Ceratozamia microstrobila is described from southeastern San Luis Potosí, Mexico. It is compared with C. zaragozae Medellin-Leal and C. hildae Landry & Wilson, to which it is mostly closely related.
... áreas de extracción de minerales y zonas industriales acompañadas de otras similares de deshe... more ... áreas de extracción de minerales y zonas industriales acompañadas de otras similares de deshechos, vastos campos de cultivo y sólo algunos fragmentos aislados de vegetación remanente que servirán de reserva para la vegetación que aún exista (Robles Gil y Dirzo, 99 ). ...
The diversity and genetic structure of seven populations of Microcycas calocoma (Miq.) A. DC, wer... more The diversity and genetic structure of seven populations of Microcycas calocoma (Miq.) A. DC, were analyzed by gel electrophoresis using 19 allozymes. The mean number of alleles per locus (A) was 1.49 and the percentage of polymorphic loci was relatively high (P ¼ 48.09). The mean observed (H o ) and expected heterozygosity (H e ) were 0.20 and 0.17, respectively. The F-statistics revealed a high population structure (F ST ¼ 0.34). Mean gene flow between population pairs was Nm ¼ 0.96. Results were compared with those of other cycad species, and indicate that M. calocoma populations have become fragmented due to increasing pressures of habitat conversion and disturbance. Also, geographical isolation among populations has generated allele loss in relation to altitude. The establishment and maintenance of protected areas for in situ conservation is critical to preserve the high genetic diversity of M. calocoma. Conservation strategy guidelines have been specified.
Se presenta un listado revisado de algunas especies de plantas mexicanas silvestres consideradas ... more Se presenta un listado revisado de algunas especies de plantas mexicanas silvestres consideradas como raras, amenazadas o en peligro de extinción, desglosadas por categoría UICN, tipo de vegetación y entidad federativa (estado); también por primera vez se incluye una relación ...
Excising the taproot of one year old seedlings of Dioon angustifolium resulted in the development... more Excising the taproot of one year old seedlings of Dioon angustifolium resulted in the development of one to three primary roots and multiple fibrous roots when inspected one year after excision, as compared to un-excised controls. These were grown on for a second year and one set of two-year old pruned seedlings was inoculated with native arbuscular mycorrhizal fungus (AMF) Glomus and cultivated in a greenhouse. A significant increase in plant growth and development was observed one year after inoculation and confirmed after a second year. From a practical point of view, taproot excision that results in development of more primary and fibrous roots enables better management of the cycad in pots and at the time of transplanting, and AMF colonization.
Propagation of threatened native plants at the Jardín Botánico Francisco Javier Clavijero (JBC) h... more Propagation of threatened native plants at the Jardín Botánico Francisco Javier Clavijero (JBC) has been on going since its foundation in 1977 with emphasis on native species. The cycad collection began in the late 1970’s and established as a national collection in the 1980’s and ongoing research on this group of plants has been in process ever since (Vovides et al. 1995, 2003). Extension to rural communities has been made for the propagation of cycads. We answer questions such as; how were the farmers convinced to cultivate the cycads? How were they taught? What problems were encountered? What was their reaction? What outcome and follow-up is there?
Six species of arbuscular micorrhizal fungi (AMF) were isolated for the first time from three cyc... more Six species of arbuscular micorrhizal fungi (AMF) were isolated for the first time from three cycad species managed in situ sustainable management nurseries; Dioon merolae, Ceratozamia matudae, and Zamia soconuscensis. The AMF species Glomus claroideum and G. fulvum, were found on the three cycad species; Acaulospora denticulata and A. scrobiculata were present in both C. matudae and Z. soconuscensis. The latter cycad species presented two additional AMF species; Acaulospora aff. delicata and G. microaggregatum. No Acaulospora species were detected on Dioon merolae. Colonization of AMF in the cycad roots reached an asymptote after 16 months with 70%, 90% and 98% colonization for Z. soconuscensis, C. matudae and D. merolae respectively, reaching 100% after 28 months for the latter two species only, Z. soconuscensis remaining at 70%.
The book is aimed at further education level and university professors and students. It gives a p... more The book is aimed at further education level and university professors and students. It gives a preabmble on environmental deterioraton due to human activities and what is a botanic garden, its importance as an educational, research and conservation institution. It includes chapters on ex situ conservationon, the history of botanic gardens worldwide and exchange of species, Mexican pre-Hispanic botanic gardens, a chapter on ecological diversity in Mexico by Jerzy Rzedowski. The concept of regional, in situ and thematic botanic gardens has been covered, such as botanic gardens established on pre exisiting vegetation, medicinal and ethnobotanic gardens, also botanic gardens involved in propagation and sustainable management as part of their mission for extension. The role of botanic gardens and education in Mexico is an important topic since more than 80% of these gardens have some kind of environmental education programme. Finally a catalogue of botanic gardens registered with the Me...
Ceratozamia microstrobila is described from southeastern San Luis Potosí, Mexico. It is compared ... more Ceratozamia microstrobila is described from southeastern San Luis Potosí, Mexico. It is compared with C. zaragozae Medellin-Leal and C. hildae Landry & Wilson, to which it is mostly closely related.
... áreas de extracción de minerales y zonas industriales acompañadas de otras similares de deshe... more ... áreas de extracción de minerales y zonas industriales acompañadas de otras similares de deshechos, vastos campos de cultivo y sólo algunos fragmentos aislados de vegetación remanente que servirán de reserva para la vegetación que aún exista (Robles Gil y Dirzo, 99 ). ...
The diversity and genetic structure of seven populations of Microcycas calocoma (Miq.) A. DC, wer... more The diversity and genetic structure of seven populations of Microcycas calocoma (Miq.) A. DC, were analyzed by gel electrophoresis using 19 allozymes. The mean number of alleles per locus (A) was 1.49 and the percentage of polymorphic loci was relatively high (P ¼ 48.09). The mean observed (H o ) and expected heterozygosity (H e ) were 0.20 and 0.17, respectively. The F-statistics revealed a high population structure (F ST ¼ 0.34). Mean gene flow between population pairs was Nm ¼ 0.96. Results were compared with those of other cycad species, and indicate that M. calocoma populations have become fragmented due to increasing pressures of habitat conversion and disturbance. Also, geographical isolation among populations has generated allele loss in relation to altitude. The establishment and maintenance of protected areas for in situ conservation is critical to preserve the high genetic diversity of M. calocoma. Conservation strategy guidelines have been specified.
Se presenta un listado revisado de algunas especies de plantas mexicanas silvestres consideradas ... more Se presenta un listado revisado de algunas especies de plantas mexicanas silvestres consideradas como raras, amenazadas o en peligro de extinción, desglosadas por categoría UICN, tipo de vegetación y entidad federativa (estado); también por primera vez se incluye una relación ...
Excising the taproot of one year old seedlings of Dioon angustifolium resulted in the development... more Excising the taproot of one year old seedlings of Dioon angustifolium resulted in the development of one to three primary roots and multiple fibrous roots when inspected one year after excision, as compared to un-excised controls. These were grown on for a second year and one set of two-year old pruned seedlings was inoculated with native arbuscular mycorrhizal fungus (AMF) Glomus and cultivated in a greenhouse. A significant increase in plant growth and development was observed one year after inoculation and confirmed after a second year. From a practical point of view, taproot excision that results in development of more primary and fibrous roots enables better management of the cycad in pots and at the time of transplanting, and AMF colonization.
Propagation of threatened native plants at the Jardín Botánico Francisco Javier Clavijero (JBC) h... more Propagation of threatened native plants at the Jardín Botánico Francisco Javier Clavijero (JBC) has been on going since its foundation in 1977 with emphasis on native species. The cycad collection began in the late 1970’s and established as a national collection in the 1980’s and ongoing research on this group of plants has been in process ever since (Vovides et al. 1995, 2003). Extension to rural communities has been made for the propagation of cycads. We answer questions such as; how were the farmers convinced to cultivate the cycads? How were they taught? What problems were encountered? What was their reaction? What outcome and follow-up is there?
Six species of arbuscular micorrhizal fungi (AMF) were isolated for the first time from three cyc... more Six species of arbuscular micorrhizal fungi (AMF) were isolated for the first time from three cycad species managed in situ sustainable management nurseries; Dioon merolae, Ceratozamia matudae, and Zamia soconuscensis. The AMF species Glomus claroideum and G. fulvum, were found on the three cycad species; Acaulospora denticulata and A. scrobiculata were present in both C. matudae and Z. soconuscensis. The latter cycad species presented two additional AMF species; Acaulospora aff. delicata and G. microaggregatum. No Acaulospora species were detected on Dioon merolae. Colonization of AMF in the cycad roots reached an asymptote after 16 months with 70%, 90% and 98% colonization for Z. soconuscensis, C. matudae and D. merolae respectively, reaching 100% after 28 months for the latter two species only, Z. soconuscensis remaining at 70%.
The book is aimed at further education level and university professors and students. It gives a p... more The book is aimed at further education level and university professors and students. It gives a preabmble on environmental deterioraton due to human activities and what is a botanic garden, its importance as an educational, research and conservation institution. It includes chapters on ex situ conservationon, the history of botanic gardens worldwide and exchange of species, Mexican pre-Hispanic botanic gardens, a chapter on ecological diversity in Mexico by Jerzy Rzedowski. The concept of regional, in situ and thematic botanic gardens has been covered, such as botanic gardens established on pre exisiting vegetation, medicinal and ethnobotanic gardens, also botanic gardens involved in propagation and sustainable management as part of their mission for extension. The role of botanic gardens and education in Mexico is an important topic since more than 80% of these gardens have some kind of environmental education programme. Finally a catalogue of botanic gardens registered with the Me...
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