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  • Open Access

    ARTICLE

    Growth of clonal modules on Agropyron michnoi in the Songnen Plain of Northeast China

    Zhang J1, C Zhou2, YF Yang1

    Phyton-International Journal of Experimental Botany, Vol.84, No.2, pp. 417-422, 2015, DOI:10.32604/phyton.2015.84.417

    Abstract Spatial expansion of clonal plants and growth of their modules are of concern in the field of plant ecology. After measuring a large number of samples, we analyzed the module components and the growth patterns of vegetatively propagated Agropyron michnoi clones in the Songnen Plain on Northeast China. The results showed that the plasticity of clonal growth was large; the coefficients of variation of both extensive areas and the quantitative characters of modules were more than 20%. The numbers of ramets, seedlings, and buds and the cumulative length of the rhizomes showed exponentially and linearly increasing patterns with increases of… More >

  • Open Access

    ARTICLE

    Nitrate reductase activity, biomass, yield, and quality in cotton in response to nitrogen fertilization

    Hernández-Cruz AE1, E Sánchez2*, P Preciado-Rangel1, M L García-Bañuelos2, A Palomo-Gil1, A Espinoza-Banda1

    Phyton-International Journal of Experimental Botany, Vol.84, No.2, pp. 454-460, 2015, DOI:10.32604/phyton.2015.84.454

    Abstract In the production of cotton (Gossypium hirsutum L.), nitrogen fertilization is one of the most costly crop practices, but important to reach high yields. However, high nitrogen (N) content in plants does not always translate into a high fibre production. One way of assessing the efficiency of the N fertilizer is through the enzymatic activity of the nitrate reductase (NR). This is a key enzyme in N assimilation, whose activity is regulated by a number of endogenous and exogenous factors that determine yield. The aim of this study was to assess the effect of N fertilization on yield, fibre quality,… More >

  • Open Access

    ARTICLE

    Effect of nitrogen source and concentration to produce proteins in mass cultures of the microalgae Chaetoceros muelleri

    López-Elías JA, R González-Vega, E Márquez-Ríos, W Torres-Arreola

    Phyton-International Journal of Experimental Botany, Vol.84, No.2, pp. 331-337, 2015, DOI:10.32604/phyton.2015.84.331

    Abstract Proteins are one of the major metabolites in biomass from microalgae that constitute the diet of marine organisms grown in aquaculture, and are essential for their growth. The quantity of this component is influenced by nutrients, temperature and light intensity, among others. We examined the growth, biomass production and protein of Chaetoceros muelleri with two sources of nitrogen (nitrate and urea) at three concentrations, using the medium f/2 (0.88 mol/L) (nitrates) as control. The treatments were the medium 2f (3.53 mol/L) and 4f (7.05 mol/L) with NO3-, and the medium f/2 (0.88 mol/L), 2f (3.53mol/L) and 4f (7.05 mol/L) with… More >

  • Open Access

    ARTICLE

    Fertilization effects with P on accumulated leaf area duration, biomass and yield of three cultivars of maize in Toluca, Mexico

    Díaz López E1, A Morales Ruíz1, EJ Vargas Ramírez1, P Hernández Herrera1, RC Reséndiz Melgar1, I Brena Hernández2, JM Loeza Corte2

    Phyton-International Journal of Experimental Botany, Vol.84, No.2, pp. 319-330, 2015, DOI:10.32604/phyton.2015.84.319

    Abstract The effect of six phosphorus levels (0, 40, 80, 120, 160 and 200 kg/ha) on the duration of cumulative leaf area, biomass and agronomic yield was determined in the maize cultivars: Amarillo Almoloya, Cacahuacintle and Condor in 2010 and 2011. Such cultivars were sown in the Cerrillo Piedras Blancas Mexico. A completely randomized complete block design with factorial arrangement was utilized. High phosphorus levels (120, 160 and 200 kg/ha) positively affected the duration of cumulative leaf area; greatest values were obtained in Cacahuacintle. A greater duration of accumulated leaf area contributes to determine high values of biomass accumulation and grain… More >

  • Open Access

    ARTICLE

    Vegetal cover estimated by digital photographs related to biomass in a grassland site in northern Mexico

    Gutiérrez-Guzmán UN1, E Castellanos-Pérez1, JJ Q uiñones-Vera1, JS Serrato-Corona1, JJ Martínez-Ríos1, I Orona-Castillo1, I Chairez-Hernández2

    Phyton-International Journal of Experimental Botany, Vol.84, No.2, pp. 312-318, 2015, DOI:10.32604/phyton.2015.84.312

    Abstract A regression model was used to determine the relationship between aerial herbaceous biomass and vegetation coverage estimated by digital images. Four samplings (n=36 each date) of vegetation cover and herbaceous biomass were performed during the growing season in 2011 in a grassland dominated by Bouteloua gracilis in La Cieneguilla, Municipality of Villa Hidalgo, Durango. Average production of dry biomass was 37.36 ± 9.66 g/m2, and mean vegetation cover 30.02%. Dry biomass data were tested for normality using the test of Kolmogorov Smirnov, finding a lack of fit. The data were subjected to a logarithmic transformation and the model Ln(y) =… More >

  • Open Access

    ARTICLE

    Sodium sulfate exposure slows growth of native pecan seedlings

    Moreno-Izaguirre E1, D Ojeda-Barrios2, G Avila-Quezada2, V Guerrero-Prieto3, R Parra-Quezada3, T Ruiz-Anchondo2

    Phyton-International Journal of Experimental Botany, Vol.84, No.1, pp. 80-85, 2015, DOI:10.32604/phyton.2015.84.080

    Abstract Pecan [Carya illinoensis (Wanngenh) K. Koch] is one of the most important nut crops in arid and semiarid regions of Mexico. Here, most pecans are grown in saline soils having poor permeability which are further degraded by the use of low-quality irrigation water. Salinity adversely affects both pecan nut quality and yield. Little work has been done to explore the physiological effects of salinity on native pecan trees. Here we examine physiological changes determined by exposure of pecan seedlings to sodium sulfate (Na2SO4) at four concentrations: 1000, 2000, 3000 and 4000 mg/L applied twice weekly over a 70 d period.… More >

  • Open Access

    ARTICLE

    Effect of prescribed fire on forage production and nutritive value of the perennial grass Saccharum griffithii

    Gul B1, M Islam2, S Ahmad3, S Gul1

    Phyton-International Journal of Experimental Botany, Vol.83, pp. 415-421, 2014, DOI:10.32604/phyton.2014.83.415

    Abstract The effect of fire on growth and nutritive value of Saccharum griffithii Munro ex Boiss-ravennae (Linn.) Murr. hybrid, a low palatable perennial grass in the semi-arid region of the highlands of Balochistan, Pakistan, was evaluated during 2008 and 2009. Prescribed fire treatments were applied in February 2008 and 2009 at the dormant stage of vegetation. Different growth parameters (tiller height, tiller number/plant), forage production (fresh, dry) and nutritive value (crude protein, ash) were compared with control (unburnt) plots. Fire increased the number of tillers, and the fresh and dry forage production in both years. Fire also improved the crude protein… More >

  • Open Access

    ARTICLE

    Linking relative growth rates to biomass allocation: the responses of the grass Leymus chinensis to nitrogen addition

    Li1,2 YY, X-T Lü1, Z-W Wang1, C Zhou3,4, X-G Han1

    Phyton-International Journal of Experimental Botany, Vol.83, pp. 283-289, 2014, DOI:10.32604/phyton.2014.83.283

    Abstract Relative growth rate (RGR) of plants is a key component of fitness. Theoretically, the RGR of plants would be closely related with biomass allocation. Our mechanistic understanding of the relationship between RGR and biomass allocation under global change scenarios is still limited. We examined the responses of RGR and biomass allocation of Leymus chinensis, a dominant grass in the temperate steppe of northern China, to a wide range of N addition. We found that N addition increased RGR of L. chinensis up to a threshold of 10 g N/m2. While leaf and stem weight ratios were positively correlated with N… More >

  • Open Access

    ARTICLE

    The nutrient accumulation pattern and cycling in natural secondary forests in North China. A case study from the Caijiachuan watershed, Shanxi Province

    Wei TX1, XJ Zhang1,2, JZ Zhu1

    Phyton-International Journal of Experimental Botany, Vol.83, pp. 213-223, 2014, DOI:10.32604/phyton.2014.83.213

    Abstract In order to examine the nutrient content, and the distribution and accumulation patterns of individual nutrients in the natural secondary forests (NSFs), sample NSF plots were selected in the Caijiachuan watershed on the Loess Plateau. On the basis of a comprehensive field inventory to the NSFs in Caijiachuan watershed, a 40 m × 40 m sample plot was selected as the representative plot. Each tree plant was then measured to select the standard tree in accordance with a diameter-scale. For measurement of the biomass in the above-ground part of the tree, it was divided into parts and measured. The study… More >

  • Open Access

    ARTICLE

    Agronomic efficiency of phosphorus, biomass and yield of two native varieties of maize and one hybrid in central Mexico

    Díaz-López E1, JM Loeza-Corte2, I Brena-Hernández2, JM Campos Pastelín2, IJ Orlando-Guerrero2, G Salgado-Benítez3

    Phyton-International Journal of Experimental Botany, Vol.83, pp. 171-178, 2014, DOI:10.32604/phyton.2014.83.171

    Abstract The Toluca´s México valley is considered a high valley because it is situated at 2560 m.a.s.l. In this region, maize is the most important crop; free pollination [Yellow, red, blue and flour maize (Cacahuacintle)] and hybrid materials are grown. Corn yield is negatively affected by an inadequate P fertilization. The aim of this study was to determine the agronomic effectiveness of phosphorus in terms of biomass and yield on three cultivars of maize as a function of six levels of phosphorus fertilization in the Toluca´s valley, Mexico. The materials Amarillo Almoloya, Cacahuacintle and Cóndor were sown under a completely randomized… More >

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