Results 121 to 130 of about 428 (163)
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Biochemical Systematics and Ecology, 1975
Abstract Biflavanoid patterns of leaves of 82 species of the order Cycadales comprising 3 families and 10 genera have been determined. The biflavanoids were identified by TLC, UV, NMR and MS studies. Pattern differences between species, when detected, involve the position or degree of methylation of the base compounds.
Dossaji, Saifuddin F +2 more
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Abstract Biflavanoid patterns of leaves of 82 species of the order Cycadales comprising 3 families and 10 genera have been determined. The biflavanoids were identified by TLC, UV, NMR and MS studies. Pattern differences between species, when detected, involve the position or degree of methylation of the base compounds.
Dossaji, Saifuddin F +2 more
exaly +2 more sources
The Botanical Review, 1999
A survey of Cycadalean taxa of Argentina (including Antarctica) is presented. The record of leaves represented byNilssonia, Pseudoctenis, Ctenis, Mesodescolea, Ticoa, Almargemia,Kurtziana, andZamia genera are summarized. Recent investigations made of cuticles with transmission and scanning electron microscopy are included. In stems, a preliminary study
Analia E. Artabe, Dennis Wm. Stevenson
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A survey of Cycadalean taxa of Argentina (including Antarctica) is presented. The record of leaves represented byNilssonia, Pseudoctenis, Ctenis, Mesodescolea, Ticoa, Almargemia,Kurtziana, andZamia genera are summarized. Recent investigations made of cuticles with transmission and scanning electron microscopy are included. In stems, a preliminary study
Analia E. Artabe, Dennis Wm. Stevenson
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Karyotype evolution by centromeric fission inZamia (Cycadales)
Plant Systematics and Evolution, 1984The chromosome numbers of several species ofZamia from Mexico are reported.Z. paucijuga, distributed from central Oaxaca to Nayarit, has been found to have 2n = 23, 25, 26, 27 and 28. 2n = 28 is the highest chromosome number yet found in the cycads. Karyotypes of this species differ principally in the number of telocentric and metacentric chromosomes ...
MORETTI, ALDO, SABATO S.
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Somatic Embryogenesis in the Cycadales
1995The cycads (Fig. 1) constitute remnant species of an ancient class of gymnosperms, the cycadophytes, that evolved from the free-sporing progymnosperms, which also gave rise to the coniferophytes. According to Gifford & Foster (1989), the cycadophytes have included 3 orders of plants, the extinct Cycadeoidales and Pteridospermales (seed ferns), that are
Richard E. Litz +2 more
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Notes on Southern African Cycadales
Bulletin du Jardin botanique national de Belgique / Bulletin van de National Plantentuin van België, 1988Description de 3 nouveaux taxons, caracteres vegetatifs de taxons du complexe Encephalartos eugene ...
J. J. Lavranos, D. L. Goode
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General Traits of the Cycadales
1990Vegetative Morphology and Anatomy. Notable contributions to the study of cycad morphology were made by Chamberlain (1919, 1935 and numerous other publications) and his students. The bibliography in Read and Solt (1986) provides entry into the literature.
L. A. S. Johnson, K. L. Wilson
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RADIAL GROWTH IN THE CYCADALES
American Journal of Botany, 1980The development of radial growth which leads to the pachycaulous form was investigated in eight of the 10 genera of the Cycadales; i.e., Ceratozamia, Cycas, Dioon, Encephalartos, Macrozamia, Microcycas, Stangeria, and Zamia. In all taxa, development of radial growth is essentially the same: a primary thickening meristem is differentiated in the stelar ...
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Genome sizes for all genera of Cycadales
Plant Biology, 2011AbstractNuclear DNA content (2C) is reported for all genera of the Cycadales, using flow cytometry with propidium iodide. Nuclear DNA content ranges from 24 to 64 pg in cycads. This implies that the largest genome contains roughly 40 × 109 more base pairs than the smallest genome. The narrow range in nuclear DNA content within a genus is remarkable for
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