Results 71 to 80 of about 1,693 (224)

G-fibers and Florin ring-like structures in Dioon (Zamiaceae)

Botan‪ical Sciences, 2016
Cuticle information and epidermal characters have great potential in systematic studies.  However, micromorphology and anatomical studies on cycads are relatively scarce in comparison to similar studies on other gymnosperms.
Andrew P. Vovides, Sonia Galicia
doaj   +1 more source

Analysis of the extranucleolar ribonucleoprotein particles of Cycas revoluta Thunb. (Cycadaceae) and Ceratozamia mexicana Brongn. (Zamiaceae)

Botan‪ical Sciences, 2022
Background: Nuclear ribonucleoprotein particles play a key role in RNA processing and in the gene expression pathway. Interchromatin granules (GICs) involved in the metabolism of pre-messenger RNA (pre-mRNA) were described in Allium cepa and ...
L. Agredano-Moreno, M. de Lourdes Segura-Valdez, J. Jiménez-Ramírez, L. Jiménez-García   +3 more
semanticscholar   +1 more source

Intraspecific chromosome variation inZamia(Zamiaceae, Cycadales) [PDF]

Caryologia, 1991
SUMMARYIntraspecific chromosome variation in three species of Zamia (Zamiaceae, Cycadales) from Mexico and Belize is reported. Zamia fischeri has 2n = 16 and 18, Z. picta has 2n = 21 and 22, and Zamia sp. nov. has 2n = 22 and 26. All cytotypes have two submetacentric and two acrocentric chromosomes but differ in number of metacentric and telocentric ...
A. MORETTI, P. CAPUTO, GAUDIO, LUCIANO, D. W. S. STEVENSON   +3 more
openaire   +2 more sources

Ceratozamia guatemalensis (Zamiaceae): A new cycad species from Mesoamerica

Phytotaxa
Ceratozamia guatemalensis, a new cycad species from the Sierra de los Cuchumatanes, Huehuetenango, Guatemala, is described and compared with the geographically proximal congeners C. vovidesii and C. matudae, with which C.
M. A. Pérez‐Farrera, Pedro DÍAZ-JIMÉNEZ, Maura L. Quezada, Andrea MARROQUÍN-TINTÍ, Héctor M. Delgado Montejo, Sandy A. MENDOZA-MONTEJO, José Saíd Gutiérrez-Ortega   +6 more
semanticscholar   +1 more source

A first characterization of the leaflet endophytic prokaryotic community in Dioon cycads

Plant Species Biology, Volume 40, Issue 6, Page 547-555, November 2025.
This study presents the first characterization of leaflet endophytic prokaryotic communities in Mexican cycads of the genus Dioon. Using 16S rRNA metabarcoding, we describe the composition and diversity of foliar bacterial communities across species and biogeographic regions, highlighting patterns potentially shaped by environmental conditions.
Gonzalo Contreras‐Negrete, Antonio Hernández‐López, Jimena Jazmín Hurtado‐Olvera, Miguel Ángel Pérez‐Farrera, José Said Gutiérrez‐Ortega   +4 more
wiley   +1 more source

Progress in the study of dioecy in Mexican cycad species and its implications for conservation

Plant Species Biology, Volume 40, Issue 6, Page 556-571, November 2025.
Cycads are endangered dioecious plants of great ornamental value that have a long period of sexual maturity. Therefore, it is crucial to have methods for early sex determination that can help to develop effective strategies for their conservation. Abstract Dioecy is a system of sexual reproduction in plants, characterized by the spatial separation of ...
Lourdes Georgina Iglesias Andreu, María Ydelia Sánchez‐Tinoco, Miguel Angel Perez‐Farrera   +2 more
wiley   +1 more source

Distribución espacial y respuesta fototrópica de Dioon merolae (Zamiaceae) en poblaciones relictuales del centro de Chiapas, México

Botan‪ical Sciences, 2012
Dioon merolae (Zamiaceae) es una especie arborescente, longeva, con tallos curvados e inclinados, posiblemente por fototropismo, que crece en laderas de montículos abruptos con suelos arenosos delgados.
Mario González-Espinosa, Beatriz Adriana Pérez-Espinosa, Neptalí Ramírez-Marcial   +2 more
doaj   +1 more source

Variabilidad y estructura genética de Ceratozamia zaragozae Medellín-Leal (Cycadales, Zamiaceae) en San Luis Potosí, México. [PDF]

, 2018
Ceratozamia zaragozae Medellin-Leal (Zamiaceae), es una cícada considerada en "Peligro Crítico”. Por lo anterior, en este trabajo se estudiaron nuevas poblaciones encontradas en San Luis Potosí para determinar su diversidad y estructura genética mediante
Gutiérrez Arroyo, Naishla Miroslava
core   +2 more sources

Assessing evolutionarily significant units in a widespread species: morphology, demography, and adaptive divergence support multiple lineages in the southern range of Dioon tomasellii (Zamiaceae)

Conservation Genetics
A majority of cycad species face multiple challenges to their long-term survival, including habitat loss and illegal collecting. Confronting these threats is made more difficult by a lack of understanding of species genetic diversity and an unstable ...
Brian L. Dorsey, J. S. Gutiérrez-Ortega, M. A. Pérez-Farrera, Timothy J. Gregory   +3 more
semanticscholar   +1 more source

FIGURE 6 in Ceratozamia sanchezae (Zamiaceae): a new cycad species from Chiapas Highlands (Mexico)

, 2021
FIGURE 6. Ceratozamia sanchezae. sp. nov. in situ. (A) Adult plant. Emerging leaves can be either light green (B) or reddish-brown (C-D) until maturation.Published as part of Gutiérrez-Ortega, José Said, Pérez-Farrera, Miguel A., Vovides, Andrew P ...
Santos-Hernández, Nancy Gabriela, López, Sergio, Vovides, Andrew P., Gutiérrez-Ortega, José Said, Ruíz-Roblero, Shirley K., Pérez-Farrera, Miguel A., Chávez-Cortázar, Angélica   +6 more
core   +1 more source