Cestrum

About: Cestrum is a research topic. Over the lifetime, 110 publications have been published within this topic receiving 1158 citations.

Karyotype differentiation of four Cestrum species (Solanaceae) revealed by fluorescent chromosome banding and FISH

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.

Solanaceae na Serra Negra, Rio Preto, Minas Gerais

Abstract: Resumo Apresenta-se o estudo taxonomico da familia Solanaceae A Juss na Serra Negra, municipio de Rio Preto, Minas Gerais A familia esta representada na area por oito generos e 26 especies As especies encontradas sao: Athenaea picta, Aureliana fasciculata, Brugmansia suaveolens, Cestrum bracteatum, Dyssochroma viridiflorum, Nicotiana tabacum, Physalis pubescens, Solanum bullatum, S capsicoides, S cinnamomeum, S decorum, S leptostachys, S leucodendron, S luridifuscescens, S lycocarpum, S melissarum, S palinacanthum, S piluliferum, S pseudoquina , S schizandrum, S sellowianum, S sisymbriifolium, S subumbellatum, S swartzianum, S vaillantii e S velleum Solanum e o genero mais representativo com 19 especies Sao apresentadas chave de identificacao, descricoes, ilustracoes, comentarios taxonomicos, ecologicos e distribuicao geografica para as especies Palavras-chave: Mata Atlântica, Serra da Mantiqueira, Solanum, taxonomia Abstract The taxonomic study of the family Solanaceae A Juss is represented in Serra Negra, Rio Preto municipality, Minas Gerais state is presented In this area the family is represented by eight genera and 26 species The species are: Athenaea picta, Aureliana fasciculata, Brugmansia suaveolens, Cestrum bracteatum, Dyssochroma viridiflorum, Nicotiana tabacum, Physalis pubescens , Solanum bullatum, S capsicoides, S cinnamomeum, S decorum, S leptostachys, S leucodendron, S luridifuscescens, S lycocarpum, S melissarum, S palinacanthum, S piluliferum, S pseudoquina , S schizandrum, S sellowianum, S sisymbriifolium, S subumbellatum, S swartzianum , S vaillantii e S velleum Solanum is the most representative genus with 19 species A key for identification, as well as, descriptions, illustrations, and comments about of the species taxonomy, ecology and geographic distribution is presented Key words: Atlantic Forest, Mantiqueira Range, Solanum, taxonomy

Occurrence of the Drosophila flavopilosa species group (Diptera, Drosophilidae) in the state of São Paulo (Brazil) with description of one new species

Abstract: One new Brazilian species of Drosophila belonging to the nesiota subgroup of the flavopilosa group, which is recorded for the first time from the State of Sao Paulo, is illustrated and described as D. mariaehelenae, sp. nov. It has been found breeding on flowers of Cestrum intermedium Sendtn., together with D. cestri Brncic, D. cordeiroi Brncic, D. cordeiroi Brncic, D. flavopilosa Frey and D. incompta Wheeler & Takada, Zygothrica vittimaculosa Burla and one undetermined species of the Drosophila tripunctata species group. Photographs are provided of the male genitalia of the first four species.

Insecticidal activity of some medicinal plants of Sri Lanka

Abstract: A wide range of solvent extracts prepared from different parts of Sri Lankan medicinal plants (101 extracts from 55 plants) were evaluated for insecticidal activity on the groundnut aphid, Aphis craccivora Koch. and the diamond back moth, Plutella xylostella (L). Of the 94 plant extracts tested for insecticidal activity againstAphis craccivora Koch., Celtiscinnamomea, Cestrum aunmticum, Costusspecious, Curcumazedoaria, Hortoniaangustifolia Ocimum gratissimum, Pleiospermium alatum and Zingiber zerumbet reported signifi- cantly high mortality (56-90%). Of the 23 extracts tested for activity against P. xylostella, only Cestrum aurantiacum, Hortonia angustifolia, Pleiospermium alatum, Curcuma zedoaria showed insecticidal activity, low pupation, adult emergence and anti-feedant activity.

The occurrence of different Bs in Cestrum intermedium and C. strigilatum (Solanaceae) evidenced by chromosome banding

Abstract: In this study, we examine the morphology, mitotic stability, meiotic behavior and the composition of heterochromatin of B chromosomes in Cestrum intermedium and C. strigilatum. The results showed that B chromosome number shows intraindividual variation in the root meristem, which seems to lead to a slight rate of B elimination in this somatic tissue. B chromosomes in both species were similar in size and shape, but differed with regard to the type, size and distribution of heterochromatin. Possible evolutionary pathways for B chromosome origin in Cestrum are discussed.