Open Access
ARTICLE
Chan RL
Phyton-International Journal of Experimental Botany, Vol.78, pp. 5-10, 2009, DOI:10.32604/phyton.2009.78.005
Abstract Transcription factors (TFs) are proteins able to specifically recognize DNA sequences in the regulatory regions of their target genes. They bind these specific sequences, an event that leads to the activation or repression of whole signal transduction pathways. In plants about 1500 TFs were informatically identified; identification was mainly based in the presence of DNA-binding domains in the translated sequences. They were classified in families and subfamilies according to several features, including the conservation of the DNA binding domain, the genes structures and the functions they exert. Among transcription factors, several seem to be potential powerful biotechnological tools to improve… More >
Open Access
ARTICLE
Sánchez E1, G Ávila-Quezada1, AA Gardea1, E Muñoz1, JM Ruiz2, L Romero2
Phyton-International Journal of Experimental Botany, Vol.78, pp. 11-16, 2009, DOI:10.32604/phyton.2009.78.011
Abstract The objective of this work was to determine the effect of different P doses on nitrogen assimilation in roots and leaves of green beans plants (Phaseolus vulgaris L. cv. Strike). Phosphorus was applied in the nutrient solution as H3PO4, at the nutrient doses of: P1 = 0.40 mM; P2 = 0.80 mM; P3 = 1.60 mM; P4 = 3.20 mM; P5 = 4.80 mM, and P6 = 6.40 mM P. Our results indicate that both P toxicity and deficiency gave similar responses to N assimilation. Phosphorus and NO3 - interacted on the absorption and translocation processes affecting N assimilation. The… More >
Open Access
ARTICLE
Peláez1 DV, RM Bóo2, MD Mayor3, OR Elia4, SA Martínez5
Phyton-International Journal of Experimental Botany, Vol.78, pp. 17-24, 2009, DOI:10.32604/phyton.2009.78.017
Abstract Plant growth in semiarid rangelands may be affected by time grazing is excluded during the post-fire regeneration period. The objective of this field work was to study the effect of post-fire defoliation at different phenological stages [vegetative (early-season defoliation) and internode elongation (late-season defoliation)] on growth of Piptochaetium napostaense and Poa ligularis, two very important perennial native grasses in the temperate semi-arid region of central Argentina (Caldenal). In general, the post-fire defoliation treatments did not affect the number of green leaves on tillers of P. napostaense. Early-season post-fire defoliation generally reduced the number of green leaves on tillers of… More >
Open Access
ARTICLE
Ochoa-Fuentes YM1, E Cerna2, J Landeros2, O Vazquez1, V Olalde3, A Flores2
Phyton-International Journal of Experimental Botany, Vol.78, pp. 25-30, 2009, DOI:10.32604/phyton.2009.78.025
Abstract Forty two Mexican isolates of Phytophthora cinnamomi Rands were examined for genetic diversity by the random amplified polymorphic DNA assay. The amount of genetic variation was evaluated by polymerase chain reaction amplification with a set of twenty one random 10-mer primers. All amplifications revealed scorable polymorphisms among the isolates, and a total of 23 band positions were scored for the 21 primers tested. Genetic distances among the isolates were calculated, and cluster analysis was used to generate a dendogram which showed relationships between them. These results suggest that the geographic groups were strong. More >
Open Access
ARTICLE
Lagoutte1 S, M Divo de Sesar2, F V ilella3
Phyton-International Journal of Experimental Botany, Vol.78, pp. 31-36, 2009, DOI:10.32604/phyton.2009.78.031
Abstract Annual floral plant crops are produced in cells or pots of various sizes. Varying container size alters the volume which plant roots can explore, which in turn affect plant growth. This work assesed the effect of the initial container size on growth of Petunia x híbrida cv Dream Mix, supplemented with cytokinins after potting. Seedlings obtained in trays of 90 or 288 cells, were transplanted to 1l pots. They were then supplemented with 6-bencyladenine (BA). The assay consisted of 4 treatments: two container sizes by two BA conditions (with and without). Cell size conditioned growth above ground and below ground;… More >
Open Access
ARTICLE
Rivera-Reyes1 JG, FA Peraza-Luna2, JC Serratos-Arévalo2, P Posos-Ponce3, SH Guzmán-Maldonado4, E Cortez-Baheza1, G Castañón-Nájera5, M Mendoza-Elos1*
Phyton-International Journal of Experimental Botany, Vol.78, pp. 37-42, 2009, DOI:10.32604/phyton.2009.78.037
Abstract Oats cereal is a worldwide significant crop. It is grown in restrictive climates and in rainy regions of temperate areas. Cultivation of oats produces high forage yields and grain quality, which gives it a wide variety of uses as animal feed and human food. However, the physiological quality of oat seeds in Mexico faces problems, which impact both their import and export. Phytic acid concentration in the oat seed plays a very important role since it affects seed viability, its germination capacity and potential seedling vigor. The objective of this study was to determine the effect of chemical fertilization on… More >
Open Access
ARTICLE
Martínez-Corral1 L, E Martínez-Rubín2, F Flores-García1, GC Castellanos2, AR Juárez2, MJD López3
Phyton-International Journal of Experimental Botany, Vol.78, pp. 43-47, 2009, DOI:10.32604/phyton.2009.78.043
Abstract The increasing demand of alfalfa crop production in the Lagunera Region has caused the search of new alternatives to the conventional methods of nutritional and hydric evaluation of alfalfa, where costs and time are optimized. The use of a machine vision system for computerized visual recognition of the crop hydric and/or nutritional stress implies the analysis and processing of certain characteristics, such as color, shape and object dimensions from a digital image. Due to the fact that identification parameters are closely related, it is necessary to compile information from specialists, foliar analysis, mathematical morphology and alfalfa crop deficiency photographs. The… More >
Open Access
ARTICLE
Brevedan1 RE, MI Aveldaño2, MN Fioretti1, MA Varillas2, SS Baioni1, HR Mirassón3, IR Palomo1
Phyton-International Journal of Experimental Botany, Vol.78, pp. 49-52, 2009, DOI:10.32604/phyton.2009.78.049
Abstract Two experiments were conducted under greenhouse conditions to study the influence of P deficiency on nitrogen nutrition of non-nodulated soybean. There was a reduction of N and P content in P deficient (P-) plants of almost 50% after 50 days. During this period, dry matter of these plants was reduced by 33%. Nitrate reductase activity and shoot nitrate content were lower in Pthan in P+ plants. Seventy five percent of nitrates in P- plants were in the roots. Nitrate accumulation in roots would be due to the lower nitrate reductase activity in this organ and a reduced water flux to… More >
Open Access
ARTICLE
García-Pereyra1 J, CGS Valdés-Lozano2, E Olivares-Saenz2, O Alvarado-Gómez2, G Alejandre-Iturbide3, E Salazar-Sosa4, H Medrano-Roldán5
Phyton-International Journal of Experimental Botany, Vol.78, pp. 53-60, 2009, DOI:10.32604/phyton.2009.78.053
Abstract We tested five Amaranthus genotypes (A. hypochondriacus 655, 653, 153-5-3, and Criollo Tlaxcala and A. cruentus genotype 33) at four population densities (31,250; 41,666; 62,500 and 125,000 plants/ha, during spring-summer (PV; July-December) 2000 and autumn-winter (OI) 2001 and 2002. Studies were conducted at the experimental station of the Agronomy Faculty of the Universidad Autónoma de Nuevo León, Mexico. A split plot experimental design on completely randomized blocks was used, with two replicates. The evaluated agronomic characteristics were grain yield (RG), dry matter yield (MS), plant height (AP), stem diameter (DT) and panicle length (LP). Crude protein (PC), ashes (C), acid… More >
Open Access
ARTICLE
Montenegro G1,*, M Gómez1, G Casaubon2, A Belancic2, AM Mujica1, RC Peña1
Phyton-International Journal of Experimental Botany, Vol.78, pp. 61-65, 2009, DOI:10.32604/phyton.2009.78.067
Abstract Three unifloral honeys were identified by the pronounced presence of specific compounds by means of sensorial analysis and SPME-GC-MS. Smoky and resinous (‘propolis’) odors characterized unifloral “quillay” (Quillaja saponaria) honey. “Corontillo” (Escallonia pulverulenta) honey was characterized by caramel and vanillin aromas, and “ulmo” (Eucryphia cordifolia) honey by having an anise scent with a floral jasmine note. Safranal was a useful marker for “corontillo” honey. Isophorone and cetoisophorone were the distinctive compounds of unifloral “ulmo” honey. In “quillay” honeys, megastigmatrienone, 2-p-hydroxyphenylalcohol and minor quantities of β-pinene and linalool oxide were correlated with their sensory properties such as resinous. More >
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