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Galatro Andrea, Ivan Rousseau, Susana Puntarulo
Phyton-International Journal of Experimental Botany, Vol.75, pp. 7-20, 2006, DOI:10.32604/phyton.2006.75.007
Abstract Electron Paramagnetic Resonance (EPR) has been developed as a versatile field that uses different techniques sharing the common feature of resonant micro-wave radiation absorption by paramagnetic substances. Certain free radicals, such as ascorbyl radical (A•), show an stable spectrum, and can be directly detected by EPR at room temperature. Studies included in this work clearly show that this highly sensitive methodology can be successfully applied to biological systems. Exposure of plants to UV-B radiation was studied as a factor of oxidative stress in plants, and the effect on A^• steady state concentration was analyzed. A kinetic More >

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Carolina Saint Pierre, Carlos Alberto Busso
Phyton-International Journal of Experimental Botany, Vol.75, pp. 21-30, 2006, DOI:10.32604/phyton.2006.75.021
Abstract This article has no abstract. More >

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Rincón-Tuexi¹, Sergio Castro-Nava², José Alberto López-Santillán², Alfredo J Huerta³, Carlos Trejo-López⁴, Florencio Briones-Encinia
Phyton-International Journal of Experimental Botany, Vol.75, pp. 31-40, 2006, DOI:10.32604/phyton.2006.75.031
Abstract Effects of water and high temperature stresses, either separately or in combination, over biomass accumulation, grain yield and its direct components grain number per ear and individual grain weight], as well as harvest index were determined in four tropical maize populations. Results indicated that water stress do not significantly affect the studied variables, due to the absence of a severe water stress during flowering. This was the result of the fallen precipitation at this time. The most important factor in this study was high temperature, which significantly reduced all studied variables, except individual grain weight.… More >

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Merchán HD, EE Lutz, AE Morant^*
Phyton-International Journal of Experimental Botany, Vol.75, pp. 41-46, 2006, DOI:10.32604/phyton.2006.75.041
Abstract In the mixed systems (beef and grain) of the semiarid Pampa, double purpose wheat use might diminish competition by the soil resource, external inputs into the system and money, which are often associated between winter cereals for grazing and/or grain harvest. In the experimental station of the Asociación de Cooperativas Argentinas in Cabildo (wheat semiarid subregion V S), a trial to evaluate shoot and grain production was conducted. The wheat (Triticum aestivum L.) variety Buck Charrúa, commercially recommended for double purpose use was utilized. Grain production of autumn-sown plots, which were defoliated 0, 1, 2 or… More >

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Montemayor Trejo^1,* José Alfredo, Alejandro Zermeño González², Jesús Olague Ramirez¹, Rogelio Aldaco Nuncio¹, Manuel Fortis Hernández¹, Enrique Salazar Sosa^1,3, José Cruz Rodríguez Rios¹, Cirilo Vázquez-Vázquez³
Phyton-International Journal of Experimental Botany, Vol.75, pp. 47-53, 2006, DOI:10.32604/phyton.2006.75.047
Abstract The objective of this study was to analyze the effect of different population densities and corn foliage structure in the penetration of photosynthetically active radiation, and its relationship to some yield parameters. The work was developed in the spring-summer cycle 2000 at the Ranch Hill Water, located in the kilometer 154 in the highway Saltillo – Matehuala. The Prime Time maize hybrid was established in a 3x2 factorial arrengement under a completely randomized block design and three replications. Two factors were studied: as factor a, three population densities (5.5, 7.4 and 11.1 plants m^-2), and as… More >

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Bonvissuto GL¹, CA Busso^2,*
Phyton-International Journal of Experimental Botany, Vol.75, pp. 55-70, 2006, DOI:10.32604/phyton.2006.75.055
Abstract This study was conducted in the Monte Austral Neuquino (MAN), Provincia de Neuquén, Argentina (39°20’ S; 69°19’ W). Vegetation is distributed at the site as vegetation patches. There are two contrasting sites on the soil of these patches: location 1, under the canopy of major perennial grasses and shrubs, and location 2, which includes the vegetation uncovered interspaces between the patches. The hypothesis of this work was that hydraulic lift is greater under than between the vegetation patches. Thermocouple psychrometers were placed under the shrubs and in the interspaces in each of two vegetation patches,… More >

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Amado Alvarez^1,2, Enrique Rubiños Panta¹, Francisco Gavi Reyes¹, Juan José Alarcón Cabañero², Elizabeth Hernández Acosta³, Carlos Ramírez Ayala¹, Enrique Mejía Saenz¹, Francisco Pedrero Salcedo², Emilio Nicolas Nicolas², Enrique Salazar Sosa⁴
Phyton-International Journal of Experimental Botany, Vol.75, pp. 71-83, 2006, DOI:10.32604/phyton.2006.75.071
Abstract A water quality index as a standardized method to compare the category in an integral way, between locations and through time, of the different water, river and stream storages of the Amajac river basin was developed. In addition, it is possible to predict the degree of contamination and establish planning strategies in the management of the water resources for the river basin in issue. The used methodology was based in the quantitative expression of water quality. Three samplings were made (2005-2006) and Dissolved Oxygen, Coliform in feaces, pH, Oxygen Biochemical Demand, Nitrates, Total Phosphorus, Turbidity… More >

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Lutz EE, HD Merchán, AE Morant^*
Phyton-International Journal of Experimental Botany, Vol.75, pp. 85-89, 2006, DOI:10.32604/phyton.2006.75.085
Abstract Management of a double purpose wheat is not easy. Therefore, a simpler management alternative was studied: the mixture of two wheat varieties, one of long- cycle and the other one of short-cycle. Research was effected in the experimental field of the Asociación of Cooperativas Argentinas (38º 36´S, 61º 58´O and 122 m asl), 15 Km SW of Cabildo (Bs. As), in the semi-arid wheat subregion V S. At this place, forage and grain production of a suitable double-purpose wheat (ProINTA Pincén) was compared to its mixture with a short-cycle variety (Cooperación Calquín), either in the More >

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Hernández-Castillo¹ FD, Adalberto Aguirre-Aguirre¹, RH Lira-Saldivar², E Guerrero-Rodríguez¹, G Gallegos-Morales¹
Phyton-International Journal of Experimental Botany, Vol.75, pp. 91-101, 2006, DOI:10.32604/phyton.2006.75.091
Abstract The biological efficiency of five stocks of Bacillus subtilis, of the mixture of the bioproducts quitosan and Larrea tridentata extract, and five synthetic fungicides were evaluated against the fungus Alternaria dauci Kühn in laboratory and greenhouse experiments. The effect of these compounds on growth and yield of carrot was also determined. Stocks of the bacteria Bacillus (B3, B9, B15 and a combination of these) and the mixture quitosan- Larrea stimulated carrot development because it reached greater width, length and weight in comparison to the control and the other treatments. Stock B3 was the best in promoting carrot growth More >

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Cárdenas-Avila^1*, ML, J Verde-Star¹, RK Maiti², R Foroughbakhch-P¹, H Gámez-González¹, S Martínez-Lozano¹, MA Núñez-González¹, G García Díaz¹, JL Hernández-Piñero¹, MR Morales-Vallarta¹
Phyton-International Journal of Experimental Botany, Vol.75, pp. 103-108, 2006, DOI:10.32604/phyton.2006.75.103
Abstract This paper reports the genotypic variability in the accumulation of proline on the in vitro calli of bean cultivars exposed to induced water and salinity stress. Remarkable variations in the proline content were found among bean cultivars exposed to both stress factors. More >

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Ojeda-Zacarías¹ Ma del Carmen, Hugo A Luna-Olvera², Lilia H Morales-Ramos², María J Verde-Star², Teresa E Torres-Cepeda², Benito Pereyra-Alférez², Leobardo Iracheta-Donjuan³, Emilio Olivares-Sáenz⁴, Raúl Salazar-Sáenz⁴, Elizabeth Cárdenas-Cerda⁴
Phyton-International Journal of Experimental Botany, Vol.75, pp. 109-113, 2006, DOI:10.32604/phyton.2006.75.109
Abstract Pinus maximartinezii (Rzedowski) is an endemic endangered species, confined to a single population of approximately 2000 to 2500 mature trees. It covers about 400 ha in southern Zacatecas, Mexico. The success of tissue culture techniques for germplasm preservation depends on regeneration of cultures. The objective of this study was to achieve an in vitro proliferation protocol using organogenesis technique for Pinus maximartinezii. Mature seeds were surface sterilized in 6% H2O2 v/v. Isolated cotyledons and zygotic embryos were cultured on shoot induction media. DCR and GD media were supplemented with 0.3 and 0.5 mgl-1 BAP; 0.01 mgl-1 ANA and More >

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Asciutto¹ K, MC Rivera¹, ER Wright¹, D Morisigue², MV López³
Phyton-International Journal of Experimental Botany, Vol.75, pp. 115-123, 2006, DOI:10.32604/phyton.2006.75.115
Abstract Rhizoctonia solani damping-off and root rot diseases are frequent in impatiens crops in Buenos Aires. Their control is based in fungicide use. In a sustainable nursery production, beneficial microorganisms that develop in organic amendments may suppress diseases and promote plant growth. The aim of this work was to evaluate the effect of different proportions of vermicompost on the growth and health of patience-plant (Impatiens wallerana). The experiment was carried out in a polyethylene greenhouse. Treatments were defined as follows: infested substrate, substrate, sterilized substrate, vermicompost, and vermicompost mixed with infested substrate at 75, 50 and 25% by More >

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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 More >

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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 More >

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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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