Showing papers on "Cestrum published in 2009"
TL;DR: The differences in band patterns among the species studied here, along with data from other nine species reported in the literature, suggest that the bands are dispersed in an equilocal and non-equilocal manner and that structural rearrangements can be responsible for internal karyotype diversification.
Abstract: The karyotypes of four South American species of Cestrum (C. capsulare,C. corymbosum,C. laevigatum and C. megalophylum) were studied using conventional staining, C-CMA/DAPI chromosome banding and FISH with 45S and 5S rDNA probes. The karyotypes showed a chromosome number of 2n = 2x = 16, with metacentric chromosomes, except for the eighth submeta- to acrocentric pair. Several types of heterochromatin were detected, which varied in size, number, distribution and base composition. The C-CMA(+) bands and 45S rDNA were located predominantly in terminal regions. The C-CMA (+) /DAPI (+) bands appeared in interstitial and terminal regions, and the C-DAPI (+) bands were found in all chromosome regions. The 5S rDNA sites were observed on the long arm of pair 8 in all species except C. capsulare, where they were found in the paracentromeric region of the long arm of pair 4. The differences in band patterns among the species studied here, along with data from other nine species reported in the literature, suggest that the bands are dispersed in an equilocal and non-equilocal manner and that structural rearrangements can be responsible for internal karyotype diversification. However, it is important to point out that the structural changes involving repetitive segments did not culminate in substantial changes in the general karyotype structure concerning chromosome size and morphology.
21 citations
Journal Article•
TL;DR: A survey of the Solanaceae family from inselbergs in the semi-arid region of Bahia State is presented, finding the genus Solanum L is the most representative with eight species, corresponding to about 58 % of the total Solan Families species.
Abstract: In this study we present a survey of the Solanaceae family from inselbergs in the semi-arid region of Bahia State. The plant collections and fi eld observations were carried out in the following municipalities: Feira de Santana, Iacu, Milagres, Itatim, Santa Teresinha, and Itaberaba, situated between 12o 14’- 12o 52’S and 39o 03’- 40o 04’W, from April 2005 to March 2006. Solanaceae is represented by fi ve genera and fourteen species: Brunfelsia unifl ora (Pohl) D. Don, Capsicum parvifolium Sendtn., Capsicum sp., Cestrum obovatum Sendtn., Nicotiana glauca Graham, Schwenkia americana L., Solanum agrarium Sendtn., S. americanum Mill, S. depauperatum Dunal, S. gardneri Sendtn., S. megalonyx Sendtn., S. paniculatum L., S. stipulaceum Roem & Schult, and Solanum sp. The genus Solanum L is the most representative with eight species, corresponding to about 58 % of the total Solanaceae species, followed by Capsicum with two species (14%) and Brunfelsia, Cestrum, Nicotiana and Schwenkia with one specie each (7%).
14 citations
01 Jan 2009
TL;DR: Molluscicidal properties of two Cestrum spp were confirmed, active principle was isolated, purified and identified as steroidal saponin and pulmonate exhibit behavior similar to contact toxicants.
Abstract: Synthetic molluscicides have proved too expensive for most countries wanting to include snail control in their anti-Schistosomiasis programme. An alternative that is not only cheaper but also safe, non-hazardous and degradable bio-molluscicides. It promotes self-reliance and empowerment of the affected communities, is the use of molluscicidal plants. Molluscicidal properties of two Cestrum spp were confirmed and active principle was isolated, purified and identified as steroidal saponin. The Lc 50 value of isolated saponin along with aqueous and alcoholic extracts of leaves of two Solanaceous plants viz. Cestrum nocturnum Linn and Cestrum diurnum Linn were determined. The Lc 50 values were obtained for 24 h, 48 h and 72 h by bioassay method against freshwater snail, Lymnea. During experimentation, the pulmonate exhibit behavior similar to contact toxicants.