Home / Journals / PHYTON / Vol.76, 2007
  • 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

    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

    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

    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

    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

    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 >

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    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

    Phaeosphaeria avenaria f. sp. triticea (anamorph Stagonospora avenae f. sp. triticea) on wheat, in Argentina

    Kiehr M, R Delhey
    Phyton-International Journal of Experimental Botany, Vol.76, pp. 85-94, 2007, DOI:10.32604/phyton.2007.76.085
    Abstract Wheat (Triticum aestivum) plants showing leaf spots associated with pycnidia of Stagonospora sp. were collected near the city of Tres Arroyos (Province of Buenos Aires, Argentina). The fungus was isolated in artificial media where it formed asexual and sexual fructifications which permitted its identification as Phaeosphaeria avenaria f. sp. triticea (anamorph S. avenae f. sp. triticea). The fungus was experimentally transmitted to wheat and barley plants and re-isolated, fulfilling Koch´s Postulates. This is the first record of P. avenaria f. sp. triticea in Argentina. More >

  • Open Access

    ARTICLE

    Forage characteristics for double purpose wheats

    Morant AE, HD Merchán, EE Lutz
    Phyton-International Journal of Experimental Botany, Vol.76, pp. 95-102, 2007, DOI:10.32604/phyton.2007.76.095
    Abstract Length of the vegetative period and forage production were evaluated in ten commercial, long term cycle wheat varieties: Buck Charrúa, Cooperación Nanihué, Buck Cacique, Cooperación Maipún, Buck Catriel, ProINTA Pigüé, Buck Poncho, ProINTA Pincén, ProINTA Super and Cooperación Liquén. The study was conducted in the experimental field of the Departmento de Agronomia, Universidad Nacional del Sur, Bahía Blanca, Argentina, under dry land conditions. A completely Randomized Block Design with five replicates was used. Seeding was effected on 9 April 1996. From the time the plant had three leaves to the Double Ridge (DA) apex stage, the apex development, tiller number… More >

  • Open Access

    ARTICLE

    Chlorination: Phytotoxicity and effects on the production and quality of Lactuca sativa var. Mantecosa grown in a closed, soil-less system

    Premuzic1 Z, HE Palmucci1, J Tamborenea1, M Nakama2
    Phyton-International Journal of Experimental Botany, Vol.76, pp. 103-117, 2007, DOI:10.32604/phyton.2007.76.103
    Abstract The addition of chlorine constitutes an economical disinfection method for closed, soil-less systems. Three quantities of sodium hypochlorite (0.55, 5.5 and 11 ppm) were applied to closed, soil-less greenhouse- grown lettuce (Lactuca sativa), to study the effect on its production (fresh weight and dry matter) and some commercial and nutritional quality factors (phytotoxicity, Vitamin C, nitrates). Sodium hypochlorite was weekly added within the nutrient solution, and the chemical properties (pH, EC and chlorides) of the recycled solution were measured. Damage to leaves was evaluated 15 days before harvest. Chlorination produced different effects regarding both production and quality. All treatments presented… More >

  • Open Access

    ARTICLE

    Germination of grasses and shrubs under various water stress and temperature conditions

    Bonvissuto GL1, CA Busso2
    Phyton-International Journal of Experimental Botany, Vol.76, pp. 119-131, 2007, DOI:10.32604/phyton.2007.76.119
    Abstract The effects of various temperature combinations and water potentials were determined on the germination of Atriplex lampa Gill. ex Moquin, Larrea divaricata Cav., Leymus erianthus (Phil.) Dubcovsky, Stipa neaei Nees ex Steudel and Poa ligularis Nees ap. Steudel under controlled conditions. The tested hypothesis was that seed germination increases with increasing temperatures and water potentials in A. lampa, L. divaricata, L. erianthus, S. neaei and P. ligularis, and that time to reach 50% of total germination is greater at lower than higher water potentials. PEG 2000 was used to impose water stress conditions. In general, obtained results conducted to accept… More >

  • Open Access

    ARTICLE

    Production of a double purpose wheat defoliated at different developmental stages of the growth apex

    Merchán HD, EE Lutz, AE Morant
    Phyton-International Journal of Experimental Botany, Vol.76, pp. 133-142, 2007, DOI:10.32604/phyton.2007.76.133
    Abstract In mixed systems (beef and grain), double purpose wheat is an alternative to reduce competition between the winter cereals for grazing and wheat for harvesting. In order to optimize grass production and avoid grain yield decreases, it is necessary to use varieties with long vegetative periods and the last defoliation should be made before the apex changes to the reproductive developmental stage. A study was conducted in the experimental field of the Asociación de Cooperativas Argentinas in Cabildo (38º 36' S, 61º 58' W) to evaluate grass and grain production of the facultative wheat variety (Triticum aestivum L) Buck Charrúa,… More >

  • Open Access

    ARTICLE

    Biosynthesis of proline in fruits of green bean plants: deficiency versus toxicity of nitrogen

    Sánchez E1, G Ávila-Quezada1, AA Gardea1, JM Ruiz2, L Romero2
    Phyton-International Journal of Experimental Botany, Vol.76, pp. 143-152, 2007, DOI:10.32604/phyton.2007.76.143
    Abstract The objective of this work was to determine the effect of deficiency versus toxicity of N on biosynthesis of proline in fruits of green bean plants (Phaseolus vulgaris L. cv. Strike). Nitrogen was applied to the nutritive solution in the form of NH4NO3 at 1.5 mM (N1), 3.0 mM (N2), 6.0 mM (N3, optimal level), 12.0 mM (N4), 18.0 mM (N5), and 24.0 mM (N6). Nitrogen deficiency (N1 and N2) was characterized by having lower proline accumulation in pods and seeds, mainly because proline degradation was stimulated by the enzyme proline dehydrogenase. On the other hand, N toxicity (N4, N5,… More >

  • Open Access

    ARTICLE

    Nitrogen fertilization of irrigated soybean

    Brevedan RE, MN Fioretti, SS Baioni, IR Palomo, H Laborde
    Phyton-International Journal of Experimental Botany, Vol.76, pp. 153-167, 2007, DOI:10.32604/phyton.2007.76.153
    Abstract A long-term study was conducted at different locations of Southwestern Buenos Aires to evaluate the effects of N fertilization at different growth stages of soybean on yield, plant nitrogen concentration and seed protein and oil concentrations. Yields were increased in six out of ten trials, and the response was highest with N fertilization at the beginning of grain development (R5). Different nitrogen sources were applied at seeding which gave higher yields and increased seed protein content than the non-fertilized, non-nodulated treatment. Urea was the most effective N source. More >

  • Open Access

    ARTICLE

    Corn production under subsurface drip irrigation and application of cow manure.

    Salazar-Sosa1 E, H I Trejo-Escareño2, C Vázquez-Vázquez1, JD López-Martínez1
    Phyton-International Journal of Experimental Botany, Vol.76, pp. 169-185, 2007, DOI:10.32604/phyton.2007.76.169
    Abstract This research was performed at the agricultural experimental center of the Facultad de Agricultura y Zootecnia, Universidad de Durango, Mexico. The main objetive was to determine the best amount of cow manure application and its effect on corn production, quality and nutrient uptake. Two factors were studied in this experiment that started in 2000. The results presented in this paper correspond to 2001. The factors were (1) crop, with the levels corn alone and corn-soybean, and (2) cow manure (with the levels: 0, 40, 80, 120, 160 Mgr/ha) and chemical fertilizer (100-150-0 kg/ha of N, P2O5 and K, respectively). The… More >

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