Results 11 to 20 of about 428 (163)

Cronología reproductora de Ceratozamia mexicana (Cycadales)

Botan‪ical Sciences, 2000
En Cemtozamia mexicana Brongn. el desarrollo de la semilla se cumple en 24 meses desde la iniciación de los óvulos en agosto hasta el desarrollo completo del cuerpo del embrión.
María Ydelia Sánchez-Tinoco, E. Mark Engleman, Andrew P. Vovides   +2 more
doaj   +3 more sources

Spermatophyta Molecular Clock: Time Drift and Recent Acceleration. [PDF]

Plant Environ Interact
Exponential increase in the base substitution rate in recent geologic time. ABSTRACT Angiospermae radiation is widely recognized as a mid‐Cretaceous event, but the adaptive radiation of Asarum and Viola as spring ephemerals also occurred during the Quaternary. To better understand the evolution of Angiospermae through geological time, a robust and well‐
Osozawa S.
europepmc   +2 more sources

Phylogenetic reconciliation provides new insights into the evolutionary diversification of the glutamine synthetase gene family in seed plants. [PDF]

FEBS J
Phylogenetic analyses of glutamine synthetase (GS) in seed plants revealed that all three major evolutionary lineages (GS2, GS1a, and GS1b) must have been present in the common ancestor, with GS2 being the first lineage to diverge. Unlike GS1b, GS1a and GS2 are usually single‐copy genes, even though they underwent duplications that resulted in ...
Aledo E, Cañas RA, Cantón FR, Aledo JC.   +3 more
europepmc   +2 more sources

Orden cycadales [PDF]

Biochemical Systematics and Ecology, 2001
ilustraciones, fotografías, mapas Se presenta el tratamiento sistematico de las especies pertenecientes al orden Cycadales que crecen en Colombia. En los capitulos introductorios se presentan la historia taxonémica, la morfologia de los érganos vegetativos y reproductivos, la citologta, la biologta de la polinizacién y la conservacién de estas plantas.
Barbara Meurer-Grimes, Dennis W. Stevenson   +1 more
openaire   +4 more sources

Unraveling Biogeographic Boundaries Within the Sierra Madre Oriental, México: An Endemicity Analysis Using a Taxonomically Diverse Dataset. [PDF]

Ecol Evol
We provide boundaries of the Sierra Madre Oriental in Mexico through a multi‐taxa endemicity analysis. ABSTRACT The Sierra Madre Oriental (SMO) is a significant mountain range and one of Mexico's 14 biogeographical provinces. Its delimitation has been debated.
Goyenechea Mayer-Goyenechea I, Montiel-Canales G, Márquez J, Hornung-Leoni CT, Castillo-Cerón JM, Manríquez-Morán NL.   +5 more
europepmc   +2 more sources

A Phytochemical and Biological Investigation of Some Plants Belong to Cycadales Order Cultivated in Egypt: Thesis Abstract [PDF]

Egyptian Journal of Cancer and Biomedical Research, 2021
Background: Gymnosperms are naked seed-producing plants and still a dark area in scientific researches although they considered as a rare gift of the nature. Cycads are one of the largest groups of living Gymnosperms.
Walaa Negm, Kamilia Abo El-Seoud, Amal Kabbash, Mona El-Aasr   +3 more
doaj   +1 more source

Recent advances on phylogenomics of gymnosperms and a new classification

Plant Diversity, 2022
Living gymnosperms comprise four major groups: cycads, Ginkgo, conifers, and gnetophytes. Relationships among/within these lineages have not been fully resolved.
Yong Yang, David Kay Ferguson, Bing Liu, Kang-Shan Mao, Lian-Ming Gao, Shou-Zhou Zhang, Tao Wan, Keith Rushforth, Zhi-Xiang Zhang   +8 more
doaj   +1 more source

1039 ZAMIA DECUMBENS: Cycadales, Zamiaceae

Curtis's Botanical Magazine, 2022
SummaryZamia decumbens Calonje, Meerman, M.P.Griff. & Hoese, a threatened cycad species from Belize, is showcased and illustrated based on field observations as well as plants cultivated in the ex situ conservation living collections of Montgomery Botanical Center (MBC) in Coral Gables, Florida.
Natalia Herrera‐Blitman, Michael Calonje, Jan Meerman, Rudy Aguilar, Alan W. Meerow, Javier Francisco‐Ortega, M. Patrick Griffith   +6 more
openaire   +1 more source

Pollen morphology of the Megamexican cycads reveals the potential of morphometrics to identify cycad genera

Botan‪ical Sciences, 2020
Background: Although pollen morphology has always been an important tool in plant systematics, the possibility of distinguishing between related taxa is still debated. A difficult case is the cycads, where their morphology and small size is very similar.
Andrew P. Vovides, Roger Guevara, Mario Coiro, Sonia Galicia, Carlos Iglesias   +4 more
doaj   +1 more source

Estimating clade‐specific diversification rates and palaeodiversity dynamics from reconstructed phylogenies

Methods in Ecology and Evolution, 2023
Understanding palaeodiversity dynamics through time and space is a central goal of macroevolution. Estimating palaeodiversity dynamics has been historically addressed with fossil data because it directly reflects the past variations of biodiversity ...
Nathan Mazet, Hélène Morlon, Pierre‐Henri Fabre, Fabien L. Condamine   +3 more
doaj   +1 more source