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  • Open Access

    ARTICLE

    Ectopic expression of the PttKN1 gene in Cardamine hirsuta mediated via the floral dip method

    Chen XJ1, RJ Guo2, YJ Tao2, X Hu2, QL Xu2

    Phyton-International Journal of Experimental Botany, Vol.84, No.2, pp. 368-374, 2015, DOI:10.32604/phyton.2015.84.368

    Abstract PttKN1 gene (Populus tremula × P. tremuloides KNOTTED1) was isolated from the vascular cambium of a hybrid aspen. Previous studies on transformed plants with the PttKN1 gene suggested that it plays roles in plant development (typically in meristem initiation), maintenance and organogenesis in simple-leaved species. To investigate the gene functions further, sequence analysis of the deduced amino acid was conducted. The results suggested that the gene belongs to the class I KNOX gene (KNOTTED1-like homeobox genes) family and might play important roles in plant development by coding a transcription factor. The gene was introduced into Cardamine hirsuta using… More >

  • Open Access

    ARTICLE

    Flower production of Gerbera jamesonii cv. Dream as a function of gibberellic and salicylic acids

    Morales-Pérez E1, EJ Morales-Rosales2, O Franco-Mora2, D de Jesús Pérez-López2, A González-Huerta2, E Urbina Sánchez3

    Phyton-International Journal of Experimental Botany, Vol.83, pp. 333-340, 2014, DOI:10.32604/phyton.2014.83.333

    Abstract The aim of this study was to assess different doses of gibberellic and salicylic acids for the production of flowers on Gerbera jamesonni after applications to their foliage or substrate under greenhouse conditions. The ten treatments (growth regulators) were evaluated in a 10 x 2 factorial experiment in a randomized complete block design with four replications. When F values were significant, the honestly significant difference test (HSD) at the 5% level of significance was used. The principal components analysis was also used to study the interrelationship among the ten treatments and the two forms of application… More >

  • Open Access

    ARTICLE

    Volatile compounds of unifloral honey and floral nectar from Quillaja saponaria

    Santander F1, C Fredes1, G Nuñez1, G Casaubon2, MI Espinoza2, G Montenegro1

    Phyton-International Journal of Experimental Botany, Vol.83, pp. 17-26, 2014, DOI:10.32604/phyton.2014.83.017

    Abstract Currently, the search for chemical markers related to the botanical origin of honey is an important issue because of its potential use as a complementary tool for melisopalinological analysis. The objective of this research was to compare the (1) volatile compounds of Quillaja saponaria Mol. (Fam. Quillajaceae) floral nectar with those of unifloral honey of this same species, and (2) volatile compounds in Q. saponaria honeys from the same geographical origin. For the identification and semiquantification of volatile compounds, Gas Chromatography with Mass Spectrometry (GC-MS) was performed. The nectar of Q. saponaria presented volatile compounds different from the… More >

  • Open Access

    ARTICLE

    Notes on the sexual condition of Myriophyllum aquaticum, Haloragaceae

    Torres Robles SS1, G Peter1,2, NM Tur3

    Phyton-International Journal of Experimental Botany, Vol.80, pp. 133-138, 2011, DOI:10.32604/phyton.2011.80.133

    Abstract Myriophyllum aquaticum (Vell.) Verdc. is native of South America and has a pantropical distribution. This species has been cited as dioecious, monoecious and polygamous. The purpose of this paper was to contribute to the discussion of its sexual condition, based on herbarium material, and supported by field observations. Herbarium material from Argentina was examined. Also, twenty branches from the Punta Lara Nature Reserve (Buenos Aires, Argentina) were periodically sampled to record the sex of flowers present on each whorl during the flowering period of 2002. Both in herbarium material and in field, we observed specimens with More >

  • Open Access

    ARTICLE

    Seventeen spp. new records for the Moss flora of Iraq

    Farhad H. Aziz

    Phyton-International Journal of Experimental Botany, Vol.80, pp. 35-46, 2011, DOI:10.32604/phyton.2011.80.035

    Abstract Samples and specimens of mosses were collected in different parts of Erbil, Sulaimani, Duhok and Even Kirkuk provinces in Iraq Kurdistan Region, since 1998 to April 2010. This collection could be taken as the representative species of mosses on the soil surface, rocks and tree barks of either terrestrial and aquatic habitats of foothills, mountains and plains. A total of 67 species distributed in 32 genera, 16 families and 9 orders were found. Among them there were 17 species in 10 genera, the 2 families Schistogaceae and Ephemeraceae and the single order Schistostegales. The rarest More >

  • Open Access

    ARTICLE

    Antibacterial and antifungic activity of the unifloral honeys of Quillaja saponaria, an endemic Chilean species

    Montenegro G, F Salas, RC Peña, R Pizarro

    Phyton-International Journal of Experimental Botany, Vol.78, pp. 141-146, 2009, DOI:10.32604/phyton.2009.78.141

    Abstract The detection of phenolics, flavonoids and related compounds by HPLC in extracts of unifloral honey of Quillay (Quillaja saponaria) showed phenolic compounds such as caffeic, coumaric and salicylic acids, the flavanone naringenin and the flavonol kaempferol. These extracts showed antibacterial activity against Pseudomonas aureginosa, Escherichia coli, Staphylococcus typhi, S. aureus, Streptococcus pneumoniae type β, and Vibrio cholerae, and antifungal activity against Candida albicans. Additionally, some aroma and decomposition compounds were identified in the ethanol extract. More >

  • Open Access

    ARTICLE

    Analysis of volatile compounds in three unifloral native Chilean honeys

    Montenegro G1,*, M Gómez1, G Casaubon2, A Belancic2, AM Mujica1, RC Peña1

    Phyton-International Journal of Experimental Botany, Vol.78, pp. 61-65, 2009, DOI:10.32604/phyton.2009.78.067

    Abstract Three unifloral honeys were identified by the pronounced presence of specific compounds by means of sensorial analysis and SPME-GC-MS. Smoky and resinous (‘propolis’) odors characterized unifloral “quillay” (Quillaja saponaria) honey. “Corontillo” (Escallonia pulverulenta) honey was characterized by caramel and vanillin aromas, and “ulmo” (Eucryphia cordifolia) honey by having an anise scent with a floral jasmine note. Safranal was a useful marker for “corontillo” honey. Isophorone and cetoisophorone were the distinctive compounds of unifloral “ulmo” honey. In “quillay” honeys, megastigmatrienone, 2-p-hydroxyphenylalcohol and minor quantities of β-pinene and linalool oxide were correlated with their sensory properties such as resinous. More >

  • Open Access

    ARTICLE

    Characterization of associated environments to natural populations of Pavonia cymbalaria (Malvaceae) in rangelands of Sierra de la Ventana (Buenos Aires)

    Torres1 YA, MA Long2, SM Zalba1

    Phyton-International Journal of Experimental Botany, Vol.77, pp. 225-240, 2008, DOI:10.32604/phyton.2008.77.225

    Abstract The objective of this work is to contribute to the biology of Pavonia cymbalaria A. St. Hil & Naudin (Malvaceae), a native species of the Southern mountains of Buenos Aires Province. This knowledge will contribute to (1) promote its use as an ornamental species, (2) its conservation and (3) stimulate the interest and public valuation of mountain systems biodiversity. Seven populations of P. cymbalaria were selected. Two of them were growing under Pinus halepensis forests to characterize different environments were the herbaceous species is growing in the wild. Environmental characteristics immediately associated to six individuals of the species More >

  • Open Access

    ARTICLE

    Water stress and forage production in Tetrachne dregei Nees, Panicum coloratum L. and Eragrostis curvula (Schrad) Nees

    Ruiz1 MA, AD Golberg1,2, O Martínez2

    Phyton-International Journal of Experimental Botany, Vol.77, pp. 7-20, 2008, DOI:10.32604/phyton.2008.77.007

    Abstract Tetrachne dregei, Panicum coloratum and Eragrostis curvula are perennial forage C4 grasses, introduced from South Africa to the pampean semiarid region. This work was carried out to compare water stress tolerance; forage production and quality of T. dregei, P. coloratum and E. curvula. Studies were conducted under greenhouse and field conditions. In the greenhouse, watering was stopped after eighty one days of plant emergency in the water stress treatment. Water potential (ψ), stomatal resistance (SR) and shoot and root weights were evaluated. Under water stress, ψ diminished earlier and SR increases were higher in P. coloratum than in T. dregei and E.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 its More >

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