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  • Open Access

    ARTICLE

    Determination of insecticide resistance in four populations of potato psillid Bactericera cockerelli (Sulc.) (Hemiptera: Triozidae)

    Cerna E, Y Ochoa, LA Aguirre, M Flores, J Landeros

    Phyton-International Journal of Experimental Botany, Vol.82, pp. 63-68, 2013, DOI:10.32604/phyton.2013.82.063

    Abstract Southeastern potato growing regions from Coahuila and Nuevo León contribute with 15% to domestic production. Such production has been impacted by several factors, in particular Bactericera (=Paratrioza) cockerelli Sulc potato psyllid, one of the most important pests affecting this crop. Its control is based on Insecticide applications, leading to unsatisfactory results and high selection pressure. Five insecticides were evaluated in four field populations of B. cockerelli from the growing region, using a susceptible laboratory line for comparison. The field populations were collected from greenhouse and commercial orchards located at Huachichil, Saltillo, Raíces and San Rafael localities. All… More >

  • Open Access

    ARTICLE

    Yield and quality of tomato with organic sources of fertilization under greenhouse conditions

    Márquez-Hernández C1, P Cano-Ríos2, U Figueroa-Viramontes3, JA Avila-Diaz4, N Rodríguez-Dimas2, JL García-Hernández1

    Phyton-International Journal of Experimental Botany, Vol.82, pp. 55-61, 2013, DOI:10.32604/phyton.2013.82.055

    Abstract The scarcity of fertilizers that are allowed in organic agriculture (AO) encourages the search for alternatives, being the use of compost one of the most outstanding. AO has been recognized as a more sustainable system than conventional agriculture. AO is ruled by strict norms which forbid the use of most common fertilizers. The aim of this study was to evaluate the effect of various fertilization treatments on the organic production of greenhousegrown tomato. A completely randomized experimental design with five replications was used, with a 5x2 factorial arrangement. Factors A and B were: a) fertilization… More >

  • Open Access

    ARTICLE

    Variation of botanical composition, forage production and nutrient values along a grassland degradation gradient in the alpine region of Qinghai-Tibet Plateau

    Wen L1, SK Dong1, YY Li1, C Pulver2, XY Li1, JJ Shi3, YL Wang3, YS Ma3, DM Liu4

    Phyton-International Journal of Experimental Botany, Vol.82, pp. 45-54, 2013, DOI:10.32604/phyton.2013.82.045

    Abstract The alpine grassland in the Qinghai-Tibet Plateau is an extensive rangeland ecosystem sustaining a sparse population of traditional nomadic pastoralists in China. However, global climate change and anthropologic disturbances have severely degraded the alpine grasslands, and the consequences of this degradation are largely unknown. Forage is the only food source for livestock in the alpine region, and livestock is the major income source for nomadic herders. Therefore, it is critical to assess the forage quantity and quality along the current grassland degradation gradient. In this study, we examined the botanical composition, biomass of different functional More >

  • Open Access

    ARTICLE

    High fluorine and other associated trace elements in waters from the south of the Pampean plain

    Espósito ME1, ME Sequeira2, JD Paoloni3, MC Blanco4, N Amiotti1

    Phyton-International Journal of Experimental Botany, Vol.82, pp. 35-44, 2013, DOI:10.32604/phyton.2013.82.035

    Abstract We investigated the levels of F and its relationship with As, B and V in ground and surface waters of the southern Pampas, where cases of dental and skeletal fluorosis, and arsenic in hair and urine samples have been detected in the rural population. Eating vegetables and cereals grown in irrigated areas with excessive fluoride may increase the risk of fluorosis due to the addition of the extra F contributed from other sources such as drinking water. Moreover, if these elements exceed the tolerance of crops produce toxicity and, like salinity, they decrease the potential… More >

  • Open Access

    ARTICLE

    Role of macroalgae in biomonitoring of pollution in «Marchica», the Nador lagoon

    Ben Chekroun K1, A Moumen1, N Rezzoum2, E Sánchez3, M Baghour1

    Phyton-International Journal of Experimental Botany, Vol.82, pp. 31-34, 2013, DOI:10.32604/phyton.2013.82.031

    Abstract The Aquatic system contamination by organic pollutants and heavy metals is one of the most serious problems that might face the environment and organisms as a whole. Interestingly, the accumulation of these pollutants is due to the anthropogenic activity, namely the intensive use of fertilizers to obtain high yields in crop production. In this paper, we compared the levels of chlorophylls, proteins, dry weight and sucrose in some red (Alsidium sp. and Gracilaria sp.) and green algae (Ulva sp.) collected from Mohandis, near Kariat and Bou Areg. Our results indicate that the algae collected nearby Bou Areg, More >

  • Open Access

    ARTICLE

    Production of biomass and carotenoids of Dunaliella tertiolecta in nitrogen-limited cultures

    López-Elías JA1, D Fimbres-Olivarría3, LA Medina-Juárez1, A Miranda-Baeza2, LR Martínez-Córdova1, DMA Molina-Quijada3

    Phyton-International Journal of Experimental Botany, Vol.82, pp. 23-30, 2013, DOI:10.32604/phyton.2013.82.023

    Abstract Microalgae have a high content of antioxidant compounds (carotenoids, phycobilins and fatty acids) used in biotechnology industry. Under stress conditions Dunaliella cells produce more carotenoids. Because of this, we evaluated growth, biomass and carotenoid production under control (indoor) and outdoor conditions using mass cultures of Dunaliella tertiolecta Butcher, under nitrogenlimited media. Control medium was f/2 (nitrates: 18.75 g/L), and limited media were f/4 (nitrates: 37.5 g/L), f/6 (nitrates: 25 g/L) and f/8 (nitrates: 18.75 g/L). The highest cell concentrations were found in cultures using medium f/2 maintained indoor (1.28 x 106 cells/mL) and outdoor (0.76 x 106 cell/mL). More >

  • Open Access

    ARTICLE

    In vitro biocontrol of tomato pathogens using antagonists isolated from chicken-manure vermicompost

    Barocio-Ceja NB1, LF Ceja-Torres1*, JL Morales-García2, HV Silva-Rojas3, R Flores-Magallón1, S Ochoa-Estradav1

    Phyton-International Journal of Experimental Botany, Vol.82, pp. 15-22, 2013, DOI:10.32604/phyton.2013.82.015

    Abstract The objectives of this study were to (1) isolate and identify pathogenic fungi from vegetative material with wilt symptoms in tomato plantations belonging to the Cienega of Chapala, Michoacán, Mexico, and (2) determine the antagonistic capacity of Trichoderma sp. and Aspergillus spp. isolated from chicken-manure vermicompost. Pathogens were isolated by means of a completely randomized sampling in 6 locations; 9 plantations were inspected and 45 plants with symptoms of the disease were selected. Portions of root and stem were disinfected and placed on potato-dextroseagar acidified (PDA). Antagonists isolation was made from a dilution of chicken-manure vermicompost… More >

  • Open Access

    ARTICLE

    Biological evaluation of bee pollen from native Chilean plants

    Montenegro G, R Pizarro, E Mejías, S Rodríguez

    Phyton-International Journal of Experimental Botany, Vol.82, pp. 7-14, 2013, DOI:10.32604/phyton.2013.82.007

    Abstract Bee pollen has gained increased interest in recent decades due to its therapeutic, antioxidant, antifungal and anticariogenic properties, as well as its potential use as a functional food product in the food industry because of its nutritional properties. Therefore, it is necessary to identify the chemical components of pollen extracts with different botanical origin, supporting the hypothesis that bee products inherit the characteristics and bioactive properties from the plants they come from. The purpose of this study was to conduct a chemical characterization of samples of pollen collected by Apis mellifera L. from plants native to… More >

  • Open Access

    ARTICLE

    Leaf epidermis in three Asteraceae native species of Argentina with ornamental potential

    Gil SP, L Seisdedos, ME Reyna, MM Cerana

    Phyton-International Journal of Experimental Botany, Vol.81, pp. 205-210, 2012, DOI:10.32604/phyton.2012.81.205

    Abstract The goals of this study were (1) to make a careful study of the foliar epidermis of Grindelia cabrerae var. cabrerae, Solidago chilensis y Wedelia buphthalmiflora, native Asteraceae from Argentina which have ornamental potential, and (2) to determine variables that indicate adaptation to xeromorphic environments. Five adult leaves from five plants were selected from each population. All the material was fixed in FAA. The epidermis of both foliar sides were macerated in hypochlorite of sodium, and obtained by scraping. They were stained with safranine and mounted in water-glycerine (1:1). From each slide, five fields were chosen and… More >

  • Open Access

    ARTICLE

    Mnesithea selloana: morphology of sinflorescence, maturity and caryopsis quality

    Galussi AA1,2, ME Moya1,2, LR Zimmermann1, FG Marchese1,2, YG Gillij1,2, F Torres1,2

    Phyton-International Journal of Experimental Botany, Vol.81, pp. 255-260, 2012, DOI:10.32604/phyton.2012.81.255

    Abstract Mnesithea selloana (known as cola de largarto, teyú ruguay) is a spring-summer-fall species that flowers and fructifies in that period; it has good forage quality, and it is in danger of extinction in the natural grasslands at the study region. The objectives of this work were to study the sinflorescence morphology, and the maturity and quality of the caryopsis to know its reproductive aspects in relation to the dissemination of this especies in grazing areas. The sinflorescence was studied in two plants during a period of 45 days, between October and December 2010, within an experimental… More >

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