Clonal and fine-scale genetic structure in populations of a restricted Korean endemic, Hosta jonesii (Liliaceae) and the implications for conservation. (1/6)
BACKGROUND AND AIMS: In plant populations the magnitude of spatial genetic structure of apparent individuals (including clonal ramets) can be different from that of sexual individuals (genets). Thus, distinguishing the effects of clonal versus sexual individuals in population genetic analyses could provide important insights for evolutionary biology and conservation. To investigate the effects of clonal spread on the fine-scale spatial genetic structure within plant populations, Hosta jonesii (Liliaceae), an endemic species to Korea, was chosen as a study species. METHODS: Using allozymes as genetic markers, spatial autocorrelation analysis of ramets and of genets was conducted to quantify the spatial scale of clonal spread and genotype distribution in two populations of H. jonesii. KEY RESULTS: Join-count statistics revealed that most clones are significantly aggregated at < 3-m interplant distance. Spatial autocorrelation analysis of all individuals resulted in significantly higher Moran's I values at 0-3-m interplant distance than analyses of population samples in which clones were excluded. However, significant fine-scale genetic structure was still observed when clones were excluded. CONCLUSIONS: These results suggest that clones enhance the magnitude of spatial autocorrelation due to localized clonal spread. The significant fine-scale genetic structure detected in samples excluding clones is consistent with the biological and ecological traits exhibited by H. jonesii including bee pollination and limited seed dispersal. For conservation purposes, genetic diversity would be maximized in local populations of H. jonesii by collecting or preserving individuals that are spaced at least 5 m apart. (+info)The shape of a long leaf. (2/6)
(+info)New steroidal saponin from Hosta sieboldiana. (3/6)
An extract of the edible parts of Hosta sieboldiana suppressed the growth of P388 mouse leukemic cells. A new steroidal saponin was isolated from Hosta sieboldiana in this study, and the structure was determined by a spectroscopic analysis to be (25R)-3beta-(alpha-L-rhamnopyranosyl-(1-->4)-beta-D-glucopyranosyl-(1-->3)-[beta- D-glucopyranosyl-(1-->2)]-beta-D-glucopyranosyl-(1-->4)-beta-D-galactopyranosyl)- 5alpha-spirostan-2alpha-ol. (+info)The relative importance of architecture and resource competition in allocation to pollen and ovule number within inflorescences of Hosta ventricosa varies with the resource pools. (4/6)
(+info)Biological and molecular characterization of a U.S. isolate of Hosta virus X. (5/6)
(+info)Increased signals from short-wavelength-excited fluorescent molecules using sub-Ti:Sapphire wavelengths. (6/6)
(+info)I'm sorry for any confusion, but "Hosta" is not a medical term. It is the name of a genus of plants commonly known as plantain lilies or hostas. They are popular ornamental plants in gardens due to their attractive foliage. If you have any questions about botanical or horticultural topics, I'd be happy to try and help with those!
I'm sorry for any confusion, but "Spirostans" is not a recognized term in medical terminology. It seems like it might be a reference to a specific chemical compound or class of compounds, possibly related to steroids, based on the prefix "spiro-" and the suffix "-stan." However, I cannot provide a precise definition without more context.
If you're referring to a specific medical or scientific concept, could you please provide more information or check the spelling? I'm here to help, and I want to make sure I give you the most accurate and helpful response possible.