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50 results for “Ephedra”
FIGURE 1. Ephedra strongylensis. A. Twig with female cones. B. Female cones. C in Ephedra strongylensis (Ephedraceae), a new species from Aeolian islands (Sicily)
FIGURE 1. Ephedra strongylensis. A. Twig with female cones. B. Female cones. C. Median longitudinal section of a female cone. D. Habit of a twig with female cones. Illustration by S. Brullo based on living material coming from type locality.
Data from: A high frequency of allopolyploid speciation in the gymnospermous genus Ephedra and its possible association with some biological and ecological features
The origin and evolution of polyploids have been studied extensively in angiosperms and ferns but very rarely in gymnosperms. With the exception of three species of conifers, all natural polyploid species of gymnosperms belong to Ephedra, in which more than half of the species show polyploid cytotypes. Here we investigate the origin and evolution of polyploids of Ephedra distributed in the Qinghai-Tibetan Plateau (QTP) and neighboring areas. Flow cytometry (FCM) was used to measure the ploidy levels of the sampled species that are represented by multiple individuals from different populations, and then two single-copy nuclear genes (LFY and DDB2) and two chloroplast DNA fragments were used to unravel the possible origins and maternal donors of the polyploids. The results indicate that the studied polyploid species are allopolyploids, and suggest that allotetraploidy is a dominant mode of speciation in Ephedra. The high percentage of polyploids in the genus could be related to some of its biological attributes such as vegetative propagation, a relatively high rate of unreduced gamete formation, and a small genome size relative to most other gymnosperms. Significant ecological divergences between allotetraploids and their putative progenitors were detected by PCA analyses and ANOVA and Tukey's tests, with the exception of E. saxatilis. The overlap of geographical distributions and ecological niches of some diploid species could have provided opportunities for interspecific hybridization and allopolyploid speciation.
FIGURE. Distribution map of Ephedra aurea (red dots) in Sicily based on herbarium materials. in Ephedra aurea (Ephedraceae), a new species from Sicily
FIGURE. Distribution map of Ephedra aurea (red dots) in Sicily based on herbarium materials.
FIGURE 6 in Ephedra strongylensis (Ephedraceae), a new species from Aeolian islands (Sicily)
FIGURE 6. Twigs of Ephedra strongylensis with leaves
Data from: A high frequency of allopolyploid speciation in the gymnospermous genus Ephedra and its possible association with some biological and ecological features
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FIGURE 4 in A new cicada species of Psalmocharias Kirkaldy feeding on an Ephedra plant from China (Hemiptera: Cicadidae)
FIGURE 4. Host plant and habitat of Psalmocharias akesensis sp. nov. A. host plant with cicadas feeding on the twigs; B. habitat; C. a cicada perching on the host plant.
FIGURE. Phenological features of Ephedra aurea. A. San Vito lo Capo (locus classicus), natural habitat. B. Habit in natural places. C–D. Detail of ripe female cones. E. Twigs with male cones. F. Twigs with female cones. G. Internodes with scale-leaf. (Photos A, C, D, G by V. Ilardi, B, E, F by S. Cambria). in Ephedra aurea (Ephedraceae), a new species from Sicily
FIGURE. Phenological features of Ephedra aurea. A. San Vito lo Capo (locus classicus), natural habitat. B. Habit in natural places. C–D. Detail of ripe female cones. E. Twigs with male cones. F. Twigs with female cones. G. Internodes with scale-leaf. (Photos A, C, D, G by V. Ilardi, B, E, F by S. Cambria).
FIGURE 1 in Ephedra pangiensis, a new synonym of E. intermedia (Ephedraceae)
FIGURE 1. Ephedra intermedia collected from Pangi Nala (a) Erect and procumbent habit (b & c) Bark (d) Hanging habit; Leaves (e) Fresh trimerous (f) Dried; (g) Fresh bimerous leaf with more than 80 % connation (h) Fresh trimerous leaf with 80 % connation.
Temporal gene expression by Ephedra herba in brain, heart and liver of mouse
GEO Series GSE20084. Mus musculus. 24 samples. Type: Expression profiling by array.
Reciprocal regulation of genes expression by Ephedra herba in mouse brain
GEO Series GSE15536. Mus musculus. 7 samples. Type: Expression profiling by array.
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