Results 31 to 40 of about 1,802 (206)
Evolution of plant reproduction: from fusion and dispersal to interaction and communication [PDF]
, 2009 Based on the existing data concerning the evolution of the sexual reproduction, it is argued that the processes of sex differentiation and interactions play a key role in evolution. From the beginning environment and organism are unified.
Willemse, M.T.M.
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Historia natural de Dioon Merolae (Zamiaceae)en Chiapas, México
Botanical Sciences, 2012 Se recopilan observaciones sobre la espadaña (Dioon merolae, Zamiaceae) de la Depresión Central (530-600 m) y de la Sierra Madre de Chiapas (1,100-1,200 m).
Julia Manuela Lázaro-Zermeño +3 more
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Middle Jurassic vegetation dynamics based on quantitative analysis of spore/pollen assemblages from the Ravenscar Group, North Yorkshire, UK [PDF]
, 2016 Quantitative analysis of the distribution of dispersed spores and pollen (sporomorphs) has been used to assess temporal floral variation through the Middle Jurassic Ravenscar Group (Aalenian–Bathonian), North Yorkshire, UK.
Slater, S.M., Wellman, C.H.
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Publishing trends for the Cycadales, the most threatened plant group
Journal of Threatened Taxa, 2016 Trends in published cycad research within various fields of study were determined using proceedings from international conferences on cycad biology and Google Scholar to access the primary literature.
April N. Cascasan, Thomas E. Marler
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On the taxonomic resolution of pollen and spore records of Earth’s vegetation [PDF]
, 2014 Premise of research. Pollen and spores (sporomorphs) are a valuable record of plant life and have provided information on subjects ranging from the nature and timing of evolutionary events to the relationship between vegetation and climate.
Mander, Luke, Punyasena, Surangi W.
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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 +3 more
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La determinación del sexo en Cícadas (Cycadales) [PDF]
Cuadernos de biodiversidad, 2012 Plants are organisms that offer unique reproductive systems to study sex determination, in other words, the expression of masculinity or femininity. Within the plant kingdom, the separation of sex has emerged over the evolutionary history in more than one hundred occasions.
Iglesias Andreu, Lourdes Georgina +4 more
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Characterization of the complete chloroplast genome of endangered Cycads Zamia fischeri Miq. ex Lem
Mitochondrial DNA. Part B. Resources, 2018 The whole chloroplast (cp) genome sequence of Zamia fischeri has been characterized. The cp genome length was 164,767 bp in length, with a GC content of 39.7%, containing a large single copy (LSC) of 90,226 bp, a small single copy (SSC) of 23,223 bp, and
Jin-Yan Lei +2 more
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Botanical Sciences, 1974 Se dan a conocer los resultados del estudio de cutículas fósiles del Cretácico inferior de Argentina mediante el uso del microscopio electrónico de barrido.
Sergio Archangelsky
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Cícadas, fósiles vivientes del reino vegetal [PDF]
, 2017 Fil: Martínez, Leandro Carlos Alcides. Instituto de Botánica Darwinion; ArgentinaFil: Artabe, Analía Emilia Eva. Universidad Nacional de La Plata.
Artabe, Analía Emilia Eva +1 more
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