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 crop yield. Within an area… More >

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, an area well-known… More >

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). Dry biomass… More >

Barocio-Ceja NB¹, LF Ceja-Torres^1*, 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 of 1 x 10^-2… More >

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 central Chile, and also… More >

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 frequency of the… More >

Galussi AA^1,2, ME Moya^1,2, LR Zimmermann¹, FG Marchese^1,2, YG Gillij^1,2, F Torres^1,2

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 field of the UNER… More >

Luján-Rangel R¹, E Olivares-Sáenz², RE Vázquez-Alvarado², L Garza-Ocañas¹, O Torres-Alanís^1(†), HJ Garza-Ulloa¹

Phyton-International Journal of Experimental Botany, Vol.81, pp. 247-253, 2012, DOI:10.32604/phyton.2012.81.247

Abstract Karwinskia parvifolia Rose synthesizes a toxin (PA1), which might be used to treat some types of tumors. Variability from 16 plants of K. parvifolia and the effect of nitrogen was evaluated on its dry fruit yield. The experiment was carried out using a crossover design, two treatment sequences and two production cycles. Collected data were: dry fruit yield (DFY), dry fruit weight (DFW) and dry endocarp weight (DWE) per plant. During Cycle 1, the group of plants that received additional nitrogen (CN) produced higher yields than the group that received no additional nitrogen (SN). Ratios of CN/SN were 1.68 (DFY),… More >

Iglesias LG¹, LY Solís-Ramos², H Viveros-Viveros³

Phyton-International Journal of Experimental Botany, Vol.81, pp. 239-246, 2012, DOI:10.32604/phyton.2012.81.239

Abstract The morphometric variation of cones, seeds and needles was evaluated in two natural populations of Pinus hartwegii at Veracruz state to estimate the percentage of phenotypic variation due to differences among populations and trees within populations. In addition, multivariate principal components, cluster and discriminate analysis was conducted to characterize the populations. Most of the traits measured on cones, seeds and needles showed significant variation both among populations and among trees within populations. Measurements of cone and seed traits used as indicators of the genetic and reproductive status of two natural populations of P. hartwegii revealed that much of the variation… More >

Peter G^1,2, FA Funk³, A Loydi⁴, AI Casalini⁵, CV Leder⁴

Phyton-International Journal of Experimental Botany, Vol.81, pp. 233-237, 2012, DOI:10.32604/phyton.2012.81.233

Abstract In the western Monte Phytogeographical Province of Rio Negro, vegetation is a shrubby-grassland steppe, where plants are interspersed within a bare soil matrix forming “phytogenic islands”. The objective of this study was to evaluate the specific composition and cover of the study ecological system under different grazing pressures. We selected areas with high, moderate and low grazing intensity at three sites. In each area we established five linear transects, where basal cover and all intercepted species were registered. Sites were arranged through a Principal Component Analysis using the Infostat software. We analyzed similarity between sites, considering basal cover and species… More >