Gutiérrez-Díez A¹, GE Salinas-García¹, L Iracheta-Donjuan², JA Torres-Castillo¹, N Mayek-Pérez³

Phyton-International Journal of Experimental Botany, Vol.82, pp. 203-208, 2013, DOI:10.32604/phyton.2013.82.203

Abstract Gene and quantitative trait loci (QTLs) localization in a model species allow to know their organization in the genome, and the possibility for the isolation and cloning of genes with agronomic importance. Seventy-three recombinant inbred lines (RILs) derived from the cross of Arabidopsis thaliana (L.) Heynh. ecotypes Columbia (Col) x Landsberg erecta (Ler) were grown in a greenhouse under contrasting soil moisture conditions (irrigated and water deficits). During their growth, some phenological (days to flowering) and plant growth traits (plant height, and number of nodes and leaves per plant) were measured. Significant differences for plant height and nodes per plant… More >

Gómez-Romero M¹, E de la Barrera², J Villegas³, R Lindig-Cisneros⁴

Phyton-International Journal of Experimental Botany, Vol.82, pp. 135-143, 2013, DOI:10.32604/phyton.2013.82.135

Abstract When degradation is severe, as it is often the case on acrisols, it is necessary to test the effect of plant-plant interactions in their survival and growth. An experiment was conducted, with substrate from an eroded site (acrisols with gullies) in a shaded greenhouse (30% shade) to evaluate the effect of fertilization and the presence of pioneer herbaceous species in the performance of Pinus pseudostrobus. The pioneer species Lupinus mexicanus and Tithonia tubiformis were used in three experimental treatments and a control. To fertilize, KH₂PO₄ was applied in four concentration levels. There were a total of 16 treatment combinations when… More >

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 >

Velázquez-Sepúlveda I, MC Orozco-Mosqueda, CM Prieto-Barajas, G Santoyo

Phyton-International Journal of Experimental Botany, Vol.81, pp. 81-87, 2012, DOI:10.32604/phyton.2012.81.081

Abstract Rhizospheric soil is one the largest reservoirs of microbial genetic diversity. Before conducting a large-scale metagenomic analysis of an environment, such as a rhizospheric soil, it is necessary to perform a pre-screening of the resident genetic diversity. In this study, we analyzed the bacterial diversity associated with the rhizosphere of wheat plants by PCR amplification, construction of a library and sequencing of 16S rDNA genes. Thirty OTUs were detected, including the Classes Alfaproteobacteria, Betaproteobacteria, Deltaproteobacteria, Gammaproteobateria, Actinobacteria, Bacilli, Clostridia and Uncultivable bacteria. Within the Gammaproteobacteria class, the genera Pseudomonas, Stenotrophomonas and Bacillus were the most abundant, since they corresponded to… More >

Urrutia J¹, R Rivera^1,2, E Hauenstein¹, P De los Ríos¹

Phyton-International Journal of Experimental Botany, Vol.81, pp. 7-13, 2012, DOI:10.32604/phyton.2012.81.007

Abstract Macrophytes of inland waters are a group of great biological interest. Although lentic systems are ideal for their growth, their presence is not so evident in oligotrophic water bodies, proliferating largely in areas with some level of contamination. A useful tool to determine the presence of a regulatory factor in the composition of these and other biological communities is the use of null models. This analysis was applied based on the co-occurrence of species through a matrix of presence and absence, with the purpose of determining the presence of randomness in species associations. The three models tested, determined the presence… More >

Bonamico¹ NC, MG Balzarini², AT Arroyo², MA Ibañez¹, DG Díaz³, JC Salerno³, MA Di Renzo¹

Phyton-International Journal of Experimental Botany, Vol.79, pp. 31-38, 2010, DOI:10.32604/phyton.2010.79.031

Abstract Resistance to Mal de Río Cuarto (MRC) disease in maize (Zea mays L.) is important in Argentina because the crop area involves a wide region where the disease is endemic. Molecular marker-assisted selection could be used as an additional selection tool to enhance precision of the genotype selection for resistance. It demands the identification of informative markers. Microsatellite (SSR) markers linked to gene(s) associated with resistance to MRC have been reported from previous QTL analyses. These analyses have been made on linkage maps derived from a relatively early mapping population. In advanced populations, where highly distinct genotypes are easily classified,… More >

Castellanos-Pérez¹ E, AG de Soyza², GB Donart³

Phyton-International Journal of Experimental Botany, Vol.77, pp. 297-320, 2008, DOI:10.32604/phyton.2008.77.297

Abstract The study was conducted in the Chihuahuan Desert Rangeland Research Center, 32 km north of Las Cruces, NM, USA. Physiological responses of the shrub Larrea tridentata (DC) Cov. and the perennial grass Muhlenbergia porteri Scribn were determined from the summer 1997 to the winter 1998-99 when they grew together. In the summer 1997, Larrea tridentata competed for water with M. porteri, as shrubs growing alone showed higher integrated photosynthesis than shrubs in competition with M. porteri following a heavy rainfall event. Larrea tridentata had lower water use efficiency (WUE) than M. porteri plants. In the summer 1998, M. porteri had… More >

Torres¹ YA, MA Long², SM Zalba¹

Phyton-International Journal of Experimental Botany, Vol.77, pp. 225-240, 2008, DOI:10.32604/phyton.2008.77.225

Abstract The objective of this work is to contribute to the biology of Pavonia cymbalaria A. St. Hil & Naudin (Malvaceae), a native species of the Southern mountains of Buenos Aires Province. This knowledge will contribute to (1) promote its use as an ornamental species, (2) its conservation and (3) stimulate the interest and public valuation of mountain systems biodiversity. Seven populations of P. cymbalaria were selected. Two of them were growing under Pinus halepensis forests to characterize different environments were the herbaceous species is growing in the wild. Environmental characteristics immediately associated to six individuals of the species were studied… More >

Lutz EE, HD Merchán, AE Morant

Phyton-International Journal of Experimental Botany, Vol.77, pp. 217-223, 2008, DOI:10.32604/phyton.2008.77.217

Abstract Forage and grain production of an early sown, long-cycle wheat variety (ProINTA Super) was compared to that in its association with a short-cycle wheat variety (Buck Pronto), both varieties exposed to one or two defoliations. The purpose was producing an earlier and greater amount of dry matter in a dual-purpose wheat. Research was conducted in the Asociación de Cooperativas Argentinas experimental field (38º 36´ S, 61º 58´ W, 122 masl), 15 km SW from Cabildo (Bs. As), in the semi-arid V South wheat subregion. Experimental plots, 7 rows 4m long each and 0,20 m apart from each other, were seeded… More >

Picca¹ A, P Roncallo¹, A Carrera¹, G Cervigni¹, R. Miranda², V Echenique¹

Phyton-International Journal of Experimental Botany, Vol.77, pp. 175-188, 2008, DOI:10.32604/phyton.2008.77.175

Abstract The aims of this work were (1) the saturation of a linkage map of durum wheat using AFPLs and RAPDs, (2) mapping of QTL related to lipoxygenase activity and (3) estimation of its usefulness in marker-assisted selection to increase pasta colour. A mapping population of 83 recombinant lines (RILs) derived from the cross between durum wheat Kofa and UC1113 (Triticum turgidum L. var. durum) was evaluated for lipoxygenase activity during two growing seasons. It was used to generate a genetic map. Forty four AFLPs, 9 RAPDs, 2 isoenzymes and 1 storage protein were mapped onto a previous genetic map consisting… More >