Showing papers on "Isovitexin published in 1985"

Effect of some Flavonoids and Phenolic Acids on Seed Germination and Rooting

Abstract: Effects of isovitexin (isolated from leaves of Rhynchosia minima), leucocyanidin, gallic acid, and protocatechuic acid on seed germination and subsequent seedling growth of a crucifer Brassica campestris, and two legumes Lens esculenta and R minima, as well as effects of isovitexin on rooting of onion bulbs are described Neither of the flavonoids affected seed germination in any of the three systems studied However, both the flavonoids promoted seedling growth in B campestris and L esculenta; the promotion of root growth was more marked At 10 −5 and 10 −7 M, isovitexin also promoted rooting of onion bulbs In the range of 227 × 10 −4 M to 328 × 10 −3 M, leucocyanidin promoted growth of both root and shoot in L esculenta, whereas in the range 328 × 10 −3 M to l64 × lO −3 M it suppressed seedling growth In contrast to the flavonoids, the two phenolic acids tested inhibited seed germination at 10 −3 M, and at lower concentrations they suppressed seedling growth The promotive effects of the flavonoids isovitexin and leucocyanidin, especially on root growth, hold promise for the use of such naturally occurring plant substances in studies on the physiology of plant growth and development

UV-microscopic studies on the vacuolar changes caused by the flavone “aglycone” isovitexin inSilene pratensis plants

Abstract: UV-microscopic and chromatographic studies have been performed on the variation in contents and configuration of the flavones present in epidermal cells of the petals, stem leaves, rosette leaves and cotyledons ofSilene pratensis plants. Most of the flavone contents is located in the vacuole of the upper epidermis cells, the concentration depending on the light intensity at which the plants were grown. In plants able to glycosylate isovitexin in the petals (genotypegG/. gl/gl fg/fg, accumulating isovitexin 7-O-glucoside) the vacuole is completely filled with the UV absorbing flavone. In plants which are unable to glycosylate isovitexin in their petals (genotypeg/g gl/gl fg/fg, accumulating only isovitexin) the upper epidermal cells of stem leaves and petals contain droplet like structures in their vacuoles. At high light intensities these structures increase in mass and become detectable in the visible light. These denser structures often condense to structures with radiating threads.

The Flavonoids and Flavonoid Systematics of Circaea (Circaeeae, Onagraceae)

Abstract: Foliar flavonoid data are given for 13 of the taxa recognized in Circaea and for six of the nine known naturally occurring hybrids. Analysis of 113 populations revealed the presence of eight glycoflavones, two flavones, and two flavonols in the genus. The glycoflavones are orientin, isoorientin, isoorientin 0-acylate, vitexin, vitexin 0-acylate, isovitexin, isovitexin 0-acylate, and vicinin-1. Apigenin 7-0-glucoside and luteolin 7-0-glucoside are the two flavones and kaempferol 3-0-glucoside and quercetin 3-0-glucoside are the two flavonols. Circaea differs from other genera of the Onagraceae investigated in exhibiting considerable interspecific and interpopulational vari- ation in flavonoid composition. Two groups of species can be recognized in Circaea based on flavonoid data; the same two groups are also recognized using morphological criteria. As in other Onagraceae, Circaea shows reduction in structural diversity and overall number of compounds with