The contamination of 137Cs in wild-growing medicinal plants was studied with regards to the species, type of forest vegetation conditions and soil specific activity of 137Cs in Zhytomyr polissya forest phytocenoses (Ukraine). The research was carried out in two plots planted in the most region typical edatopes - fresh and wet subor (Querceto-Pinetum). Species composition of phytocenoses was analyzed and the plants that can be harvested for pharmaceutical industry were identified on these test plots,. The herbal substance samples were tested to determine the specific activity of 137Cs. The studies have shown significant variability in the content of radionuclides due to differences in the level of radioactive contamination in the soil and accumulative capacity of plant species. For European blueberry, the peculiarities of 137Cs accumulation in vegetative and generative organs were studied. Comparison of the content of 137Cs in pants of different edatopes showed more higher intensity of radionuclide accumulation in wet suborbs compared to fresh suborbs. The average values of concentration factors were calculated and their rankings were built according to the intensity of 137Cs accumulation for the plants in each edatope. All studied medicinal plants were divided into four groups according to the contration factor: with weak accumulation, moderate accumulation, strong accumulation, and very strong accumulation. Based on the permissible content of 137Cs in wild-growing medicinal plants (600 Bq/kg), the maximum permissible level of soil contamination with radionuclides was determined for each medicinal plant species.

Antecedentes y Objetivos: Govenia purpusii es una especie de la familia Orchidaceae, tiene una distribución restringida dentro de los bosques subalpinos de los estados de Chiapas, Colima, Durango, Guerrero, Hidalgo, Jalisco, México, Michoacán, Oaxaca, Puebla, Querétaro, Veracruz y Zacatecas. El propósito de este trabajo fue describir el hallazgo de esta especie presente en el Parque Nacional La Malinche, Tlaxcala, para incluirla en el inventario florístico. Métodos: Se identificó una población de G. purpusii en campo y se realizaron colectas. A través del cotejo de material botánico recolectado con ejemplares de herbario, se determinó la especie considerando caracteres vegetativos y florales para su identificación. Resultados clave: La especie se encontró en una vegetación de Quercus-Pinus a 2780 m de altitud; comparte el espacio con Selaginella sp., Oxalis sp., Peperomia sp. y Pinguicula moranensis. Conclusiones: Se recomienda monitorear esta población debido a la reducida área de distribución dentro del Parque Nacional La Malinche y al escaso conocimiento sobre orquídeas terrestres en la entidad. La extinción local representaría una pérdida de material genético para la especie. No se debe interpretar este registro como una ampliación reciente de área de distribución; la presencia dentro de esta zona puede ser el resultado de la fragmentación de los bosques en la Faja Neovolcánica Transmexicana.

Normal 0 21 false false false MicrosoftInternetExplorer4 Os oleos essenciais obtidos por hidrodestilacao das folhas e caules de Peperomia pellucida coletadas de um fragmento de Mata Atlântica no estado da Bahia, Brasil, foram analisados utilizando cromatografia gasosa e cromatografia gasosa-espectrometria de massa. Independentemente da parte da planta, sesquiterpenos foram a classe de compostos mais abundantes nos oleos, seguido de fenilpropanoides. Os principais constituintes do oleo das folhas foram ? -gurjuneno (11,34%), 1,10-di- epi -cubenol (11,27%), ( E )-cariofileno (8,71%) e dillapiole (8,50%), enquanto que carotol (9,77%), dillapiole (9,18%), trans - ? -guaieno (9,05%) e ( E )-cariofileno (8,53%) foram os principais constituintes do oleo de caule. A atividade dos oleos contra Tetranychus urticae foi avaliada por 24 h. O oleo do caule (LC 50 = 1 x 10 -2 µL/L of air) foi quatro vezes mais toxico do que o oleo de folha (LC 50 = 4 x 10 -2 µL/L of air), mas 2,5 vezes menos ativo do que o eugenol, o qual foi utilizado como o controle positivo .

Se estudió la composición del aceite esencial de las hojas de Peperomia hernandiifolia (Piperaceae) de Costa Rica, mediante la técnica de cromatografía de gases capilar y espectrometría de masas (GC/MS). Se identificaron ocho compuestos que representan cerca de 99% del aceite obtenido. El aceite está constituido casi exclusivamente por derivados de ácidos grasos. El decanal (85.0%) es el constituyente mayoritario, seguido por el ácido decanoico (12.6%).

Bacterial soft rot can be a destructive disease of ornamental plants. To identify the pathogenic soft rot bacteria occurring in ornamental plants in Tehran and Markazi provinces (Iran), 57 isolates were obtained from 12 different mono- and dicotyledonous hosts and investigated with regard to phenotypic, genotypic and pathogenicity features. Based on phenotypic characteristics, the bacterial strains were identified as Pectobacterium carotovorum subsp. carotovorum. This was confirmed by subspecies-specific primers using PCR. Inoculation of all isolates into Aglaonema leaves confirmed the pathogenecity of the isolated strains. To assess the genetic diversity within Pectobacterium carotovorum subsp. carotovorum populations by rep-PCR, 26 isolates were selected according to their host and geographic distribution as well as two strains from Guilan province. Cluster analysis was conducted using the UPGMA method and revealed a possible close relationship between DNA fingerprints and geographical origins of isolates. Our results showed significant genetic variation among the populations of this pathogen. To the best of our knowledge, this is the first report of Pectobacterium carotovorum subsp. carotovorum on Peperomia obtusifolia, P. caperata, Pilea cadierei, Plectranthus australis, Saintpaulia ionantha and Kalanchoe tubiflora in Iran.

Shoot Formation from Leaf Explants and Apical Meristems of "Peperomia obtusifolia" A. Dietr. : Stability of Ploidy Level in Their Subcultures.