Cestrum

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

On the metabolism of cinnamic acid in Cestrum poepigii: identification of o-coumaric acid and an o-coumaroylquinic acid.

Abstract: L'acide o-coumarique et un acide o-coumaroyl quinique sont des metabolites de l'acide cinnamique chez Cestrum poepigii.

A new species of Cestrum (Solanaceae) from the Cordillera de Mérida, Venezuela

Abstract: A new species ofCestrum from the Cordillera de Merida in Trujillo state is described and illustrated.Cestrum darcyanum, morphologically similar toC. microcalyx Francey, is distinguished by dendritic pubescence on its branchlets and leaves, larger corolla, stamens distended and geniculate above their point of adnation to the corolla, and larger calyx. A key is provided for species of VenezuelanCestrum possessing dendritic pubescence.

Análisis morfométrico de Cestrum guatemalense, C. mexicanum y C. pacayense (Solanaceae)

Abstract: Ha existido una confusion taxonomica entre Cestrum guatemalense Francey, C. mexicanum Francey y C. pacayense Francey, especies distribuidas en el sur de Mexico, Guatemala, Honduras y El Salvador. La dificultad para reconocer estas especies se debe en parte a la plasticidad de algunos de sus caracteres morfologicos, por lo que incluso se han propuesto como sinonimos. Para tratar de diferenciar estas especies, se revisaron 158 ejemplares del acervo de los herbarios F, IEB, MEXU, MO, NY, TEX y US, evaluando 21 caracteres morfologicos vegetativos y florales, de los cuales 15 pasaron pruebas de normalidad, homocedasticidad y presentaron diferencias significativas. Con esta informacion se realizaron analisis de componentes principales y discriminante canonico. Las caracteristicas que tuvieron mas importancia en los analisis fueron las relacionadas con el caliz y filamentos de los estambres. El analisis de componentes principales presenta 2 agrupamientos, uno de estos es exclusivo de especimenes identificados como C. mexicanum , lo cual fue corroborado con el analisis discriminante. Por todo lo anterior, consideramos adecuado restablecer C. mexicanum como una especie valida y los individuos de las otras especies permanecen como un complejo que necesita estudios adicionales para determinar su delimitacion.

Estimación del tamaño del genoma en especies de la tribu Cestreae (Solanaceae) mediante citometría de imagen

Abstract: Estimation of genome size in species of the tribe Cestreae (Solanaceae) by image cytometry. Cestrum, Sessea and Vestia genera belong to Cestreae tribe and have several chromosome characteristics that differentiate it from other species of Solanaceae, such as number and size. Genome size would contribute to new hypotheses about evolution in basal clades of Solanaceae. To estimate the genome size Cestreae species was used image cytometry of telophase and interphase nuclei stained with Feulgen technique. The values of genome size in species analyzed ranging from 17.22 to 24.40 Gpb (2C), being the largest genome sizes of the family. Furthermore, the results show that the image cytometry is an alternative method to flow cytometry for the determination of the genome size in practical and economical way.

PROPAGAÇÃO DE Cestrum corymbosum POR SEMENTES E ESTAQUIA

Abstract: Cestrum corymbosum e um arbusto ornamental nativo do Brasil. A pesquisa visou estudar sua propagacao sexuada e vegetativa, avaliando a germinacao e o crescimento e testando o efeito do tamanho das estacas e do acido indolbutirico (AIB) no seu enraizamento e desenvolvimento. Para avaliar a germinacao, foram utilizadas seis repeticoes de 100 sementes. Em seguida, 200 plântulas foram transferidas para embalagens individuais mantidas em canteiro. O experimento de propagacao vegetativa, com delineamento inteiramente casualizado em arranjo fatorial 3 x 2, constituiu-se na combinacao de tres concentracoes de AIB (0, 1000 e 2000 mg.L-1) e dois tamanhos de estacas (8 e 15 cm). As estacas foram plantadas em substrato comercial Plantmax HA®. No experimento de propagacao sexuada, verificou-se elevada germinacao (92%), assim como alta taxa de sobrevivencia apos repicagem para recipientes individuais (99,5%). Para o experimento de propagacao vegetativa, foi detectada influencia significativa do tamanho das estacas em relacao a sobrevivencia, enraizamento (P < 0,01) e numero de folhas (P < 0,05). Estacas de 8 cm apresentaram melhor sobrevivencia (93,3%) e enraizamento (91,3%). A aplicacao de concentracoes de AIB nao resultou em diferencas significativas (P < 0,01), demonstrando nao ser necessaria para o enraizamento dessa especie. Palavras-chave: Germinacao; enraizamento; acido indolbutirico; especie nativa; Solanaceae. Abstract Propagation of Cestrum corymbosum by seeds and cuttings. Cestrum corymbosum is an ornamental bush native from Brazil. This research aimed to study the sexual and vegetative propagation of this species, evaluating germination and growth of the seedlings, and testing the influence of indolebutyric acid (IBA) and cuttings size on its rooting and development. In order to evaluate germination, six repetitions of 100 seeds were considered. After that, 200 seedlings have been transplanted to individual packages kept in a bed. The vegetative propagation experiment has been arranged in a 3 x 2 factorial completely randomized design that comprised the combination of three IBA concentrations (0, 1000 and 2000 mg.L-1) for two cuttings sizes (8 and 15 cm). The cuttings were planted in commercial substrate Plantmax HA®. A high germination (92%) has been verified. The survival after transplantation was very high (99.5%). It was detected statistically significant influence of the cuttings size on plants survival, rooting (P<0.01) and leaves number (P<0.05). The cuttings of 8 cm presented better survival (93.3%) and rooting (91.3%) rates. The treatment with IBA in distinct concentrations did not produce results with significant differences (P<0.01). Keywords: Germination; rooting; indolebutyric acid; native species; Solanaceae.