Meiosis and pollen grain development in Isolepis cernua f. cernua (Cyperaceae)
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چکیده
منابع مشابه
Phytotoxic compounds from Flourensia cernua.
Bioassay-directed fractionation of a CH(2)Cl(2)-MeOH (1:1) extract of the aerial parts of Flourensia cernua led to the isolation of three phytotoxic compounds, namely, dehydroflourensic acid (1), flourensadiol (2) and methyl orsellinate (3). Dehydroflourensic acid is a new natural product whose structure was established by spectral means. In addition, the known flavonoid ermanin and seven hithe...
متن کاملA new triterpenoid saponin from Pulsatilla cernua.
A new triterpenoid saponin was isolated from Pulsatilla cernua, along with eight known triterpenoids and triterpenoid glycosides. The new compound was identified as 3-O-beta-D-glucopyranosyl-(1-->4)-alpha-L-arabinopyranosyl-bayogenin-28-alpha-L-rhamnopyranosyl-(1-->4)-beta-D-glucopyranosyl-(1-->6)-beta-D-glucopyranosyl ester (1) on the basis of 1D, 2D-NMR techniques, including COSY, HMBC, and H...
متن کاملSaponins with neuroprotective effects from the roots of Pulsatilla cernua.
Four new oleanene-type triterpenoid saponins together with six known saponins were isolated from the roots of Pulsatilla cernua and their structures were elucidated on the basis of spectroscopic data, including 2D NMR spectra and chemical evidence. Among these one of the aglycones (gypsogenin) is reported for the first time from this genus. Some of these compounds showed significant neuroprotec...
متن کاملRespiratory Shifts in Developing Petals of Saxifraga cernua.
Changes in the oxygen uptake of petal slices by the cytochrome and alternative respiratory pathways were monitored during petal development in the arctic herb Saxifraga cernua. As the petals developed, rates of total respiration increased to a maximum rate during petal unfolding (day 4.5), and thereafter declined. Respiration in petals of all ages was at least partially resistant to cyanide, in...
متن کاملIsopalhinine A, a Unique Pentacyclic <italic>Lycopodium</italic> Alkaloid from <italic>Palhinhaea cernua</italic>
A new pentacyclic (5/6/6/6/7) Lycopodium alkaloid named isopalhinine A (1), which possesses a sterically congested architecture built with a tricyclo[4.3.1.0]decane (isotwistane) moiety and a 1-azabicyclo[4.3.1]decane moiety, and palhinines B (2) and C (3) were isolated from Palhinhaea cernua. The structure and absolute configuration of 1 were elucidated by a combination of NMR spectra, optical...
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ژورنال
عنوان ژورنال: Caryologia
سال: 1999
ISSN: 0008-7114,2165-5391
DOI: 10.1080/00087114.1998.10589173