Home / Advanced Search

  • Title/Keywords

  • Author/Affliations

  • Journal

  • Article Type

  • Start Year

  • End Year

Update SearchingClear
  • Articles
  • Online
Search Results (1,101)
  • Open Access

    ARTICLE

    SHORT NOTE - Cylindrocladium spathiphylli, a causal agent of root and crown rot of Spathiphyllum wallisii in Buenos Aires, Argentina

    Grijalba PE, HE Palmucci

    Phyton-International Journal of Experimental Botany, Vol.76, pp. 79-84, 2007, DOI:10.32604/phyton.2007.76.079

    Abstract A new disease of Spathiphyllum wallisii plants, characterized by leaf yellowing and wilting due to root and crown rot, was observed in nurseries of the Great Buenos Aires, Argentina. A fungus was consistently isolated from diseased tissue and identified as Cylindrocladium spathiphylli, on the base of its morphological and cultural characteristics. Inoculation tests were carried out which confirmed this fungus as the causal agent of the disease. This is the first report of C. spathiphylli causing root and crown rot of S. wallisii in Buenos Aires. More >

  • Open Access

    ARTICLE

    Germination as a selection parameter in Karwinskia for its productivity potential in peroxisomicine A1

    Luján-Rangel1 R, E Olivares-Sáenz2, RE Vázquez-Alvarado2, L Garza-Ocañas3, O Torres-Alanís3

    Phyton-International Journal of Experimental Botany, Vol.76, pp. 61-77, 2007, DOI:10.32604/phyton.2007.76.061

    Abstract Karwinskia parvifolia (Kp) and Karwinskia humboldtiana (Kh) are poisonous plants of the rhamnacea family. Toxicological and clinical studies performed with one of the compounds present in the fruit [peroxisomicine A1 (PA1)] suggest its possible pharmacological usefulness in the treatment of certain types of cancer. This is why these plants are cultivated: to increase their productivity of PA1. We studied the effects of nitrogen and species on seed viability. The germination curve was determined for Kp with (Kp-WN) and without (Kp-NN) nitrogen, and for Kh without nitrogen (Kh-NN) using the probit model. This is characterized by the probability of germination in… More >

  • Open Access

    ARTICLE

    Seed rain in and between vegetation patches in arid Patagonia, Argentina

    Bonvissuto1 GL, CA Busso2

    Phyton-International Journal of Experimental Botany, Vol.76, pp. 47-59, 2007, DOI:10.32604/phyton.2007.76.047

    Abstract Seed rain has ecological consequences on plant community structure. This study was conducted in the Monte Austral Neuquino nearby the town of Picún Leufú, Province of Neuquén, Argentina, within an area of 15 km x 15 km (39º 20 32' S; 69º19 30' W). Studies were conducted at two sites, distant 1.5 km from one another. Vegetation is distributed on the soil surface as vegetation patches. Four superficial locations may be found in the soil of these patches: location 1, small dune accumulated under the lee; location 2, found at the edge of the small dune, and below the major… More >

  • Open Access

    ARTICLE

    Alkaloids in Solanum torvum Sw (Solanaceae)

    Pérez-Amador1 MC, V Muñoz Ocotero1, JM García Castañeda1, AR González Esquinca2

    Phyton-International Journal of Experimental Botany, Vol.76, pp. 39-45, 2007, DOI:10.32604/phyton.2007.76.039

    Abstract A comparison was made between plants of Solanum torvum Sw that grow in Chiapas, Mexico, and plants of the same species originating from India. This was effected to establish either similarities or differences between these plants in total alkaloid contents and presence of solasodine, an important alkaloid for the partial synthesis of steroids. The total alkaloid content (0.12%) of the plants coming from Chiapas and India was the same. However, solasodine was found only in the plants of Chiapas. In addition, the total amount of glycoalkaloids (0.038%) and two glycosilated compounds derived from solasodine, solasonine (0.0043%) and solamargine (0.0028%), were… More >

  • Open Access

    ARTICLE

    Light and temperature effects on seed germination of four native species of Mediterranean high mountains (Spain)

    Serrano-Bernardo F1, JL Rosúa1, M Díaz-Miguel2

    Phyton-International Journal of Experimental Botany, Vol.76, pp. 27-38, 2007, DOI:10.32604/phyton.2007.76.027

    Abstract The Mediterranean region is considered one of the most important zones worldwide in terms of plant diversity. Sierra Nevada (S Spain) is a unique mountain massif within the high-mountain systems of the Mediterranean. It is of great floristic importance and very rich in endemic species. However, it requires numerous tasks for restoring plant cover due to the constant anthropic degradation, especially because of the ski station located near the second-highest peak of the mountain. One of the restoration efforts consists of trying to reproduce, in the laboratory, the ideal conditions to pre-germinate seeds of some of the species most threatened… More >

  • Open Access

    ARTICLE

    Pitaya (Stenocereus stellatus) fruit growth is associated to wet season in Mexican dry tropic

    García-Suárez1 F, L Carreto-Montoya2, R Cárdenas-Navarro3, JC Díaz-Pérez4, R López-Gómez

    Phyton-International Journal of Experimental Botany, Vol.76, pp. 19-26, 2007, DOI:10.32604/phyton.2007.76.019

    Abstract In this work we contribute to the knowledge of the reproductive phenology of Stenocereus stellatus (Pfeiffer,Riccobono), a columnar cactus that produces fruits of high commercial perspectives known as “pitayas”. This kind of pitayas are produced for local commercialization in back orchards in some regions of the Mexican dry tropics. These fruits are produced only in the apical part of the cactus “arms”. Our results show that fruit development of pitayas is highly associated to the rainy season of the year. This behavior is different from the reproductive strategy of other columnar cactus species that produce other kinds of pitaya in… More >

  • Open Access

    ARTICLE

    Effects of water stress at different temperatures on germination of Bulnesia retama seeds (Gill. ex. Hook.) Griseb. -Zigofiláceas- in San Luis, Argentina

    Rodríguez Rivera M F, LR Sosa, EA Fernández, M I Reale, V Villarreal

    Phyton-International Journal of Experimental Botany, Vol.76, pp. 5-17, 2007, DOI:10.32604/phyton.2007.76.005

    Abstract We studied the germination capacity of Bulnesia retama seeds to conditions of water stress simulated by PEG6000 at different temperatures. We also evaluated their recovery to water stress conditions. Seeds were collected in San Luis city, Argentina. They were placed in polyethylene bags with different concentrations of PEG6000 to simulate water potentials of 0 (control); -0.25; -0.5; -0.75; -1; -1.25 and -1.5 MPa. Seeds were placed in culture oven without light to three temperatures: 18º, 25º and 32 ºC. Non-germinated seeds were washed and placed again to germinate in distilled water to 25 ºC. We registered the percentage and the… More >

  • Open Access

    ARTICLE

    Essential oil and phototoxic compounds in Clibadium surinamense L. and Montanoa grandiflora D.C. (Asteraceae)

    Pérez-Amador* MC, V Muñoz*, A Noyola*, F García-Jiménez**

    Phyton-International Journal of Experimental Botany, Vol.75, pp. 145-150, 2006, DOI:10.32604/phyton.2006.75.145

    Abstract Two Asteraceae species, Clibadium surinamense L. and Montanoa grandiflora D.C., were analyzed to determine the composition of the essential oil and to search for phototoxic compounds.
    Three parts of the plants were studied, inflorescence, stems and leaves. Intra and interspecific differences were found in the essential oil composition, which was determined by gas chromatography.
    In the chromatographic profiles, run for phototoxic compounds, spots for these products were present in the Clibadium surinamense extracts, but were absent in Montanoa grandiflora.
    From the hexane extract of Clibadium surinamense inflorescence 2 new polyacetylene esters were isolated, ichtyothereol capric ester and… More >

  • Open Access

    ARTICLE

    Variability in leaf morphology and anotomy in Lippia turbinata (Verbenaceae) in the Province of San Luis (Argentina)

    Andersen A, Lucchini F, J Moriconi, EA Fernández

    Phyton-International Journal of Experimental Botany, Vol.75, pp. 137-143, 2006, DOI:10.32604/phyton.2006.75.137

    Abstract Medicinal plants with mesomorphic and xeromorphic characteristics are a significant component of the indigenous flora of San Luis province. In popular medicine, Lippia turbinata “poleo” has emmenagogic, diuretic and stomach properties.
    The morphological and anatomical aspects of foliar leaves were studied according to their environmental conditions, in order to contribute to the identification of samples of commercial drugs. From the studied sections, differences in the following aspects were detected, namely the form and type of epidermic cells, the presence of idioblasts in adaxial epidermic position, thickness of cuticle, density of nonglandular trichomes, the structure of the mesophyll and the… More >

  • Open Access

    ARTICLE

    Classification and estimation of genetic diversity in Nopal Opuntia spp based on phenotypic descriptors and genetic-molecular markers

    García-Zambrano2 Eduardo A, Adriana Gutiérrez-Díez, Gilberto E Salinas-García, Elizabeth Cárdenas-Cerda, Rigoberto E Vázquez-Alvarado, Francisco Zavala-García, Jesús Martínez de la Cerda

    Phyton-International Journal of Experimental Botany, Vol.75, pp. 125-135, 2006, DOI:10.32604/phyton.2006.75.125

    Abstract The objective of this investigation was to develop and apply molecular markers (type RAPD) for estimating the genetic diversity of 100 Opuntia accessions from the Germoplasma Bank of the FAUANL. The molecular data were evaluated by multivariate analysis using the methods of Ward and UPGMA. These results were compared with phenotypic data taken from the same accessions, already evaluated by the above mentioned methods. The protocol was modified for the extraction of the Opuntia DNA to reduce the quantity of polysaccharides and their influence in its quality. Later on, a protocol was developed for the generation of molecular markers of… More >

Displaying 971-980 on page 98 of 1101. Per Page