Argüello JA, L Seisdedos, MC Díaz Goldfarb, EA Fabio, SB Núñez, A Ledesma

Phyton-International Journal of Experimental Botany, Vol.82, pp. 289-295, 2013, DOI:10.32604/phyton.2013.82.289

Abstract The objective of this work was to analyze the impact of a vermicompost treatment on anatomical and physiological modifications related to assimilate partitioning and growth in lettuce seedlings. The results showed that vermicompost increased growth, which was most likely due to an increased activity of the ground meristem of the leaf blade. A greater height and number of chlorenchyma layers were observed in the leaf blade. This was related to an increase in the photosynthetic activity, expressed by an increase in the net assimilation rate. Vermicompost also showed an effect at the procambium level, producing More >

Rivera MC¹, ER Wright¹, MC Fabrizio², G Freixá¹, R Cabalini¹, SE Lopez³

Phyton-International Journal of Experimental Botany, Vol.82, pp. 227-234, 2013, DOI:10.32604/phyton.2013.82.227

Abstract Damping off is a frequent disease that kills seedlings. Cultural and biological controls are the only tools in organic crops to manage this disease, and only empirical information is available on the efficiency of plant preparations. This work evaluates the effects of fermented onion decoctions on the growth of Rhizoctonia solani and Sclerotium rolfsii and disease incidence. Broth (B) and sterilized broth (SB) were respectively obtained by boiling chopped yellow onions in water, and incubating for 14 days at room temperature, with or without subsequent sterilization. The pathogens were grown on potato dextrose agar supplemented with B… More >

Shang ZH^1,2, SG Xu¹

Phyton-International Journal of Experimental Botany, Vol.81, pp. 75-79, 2012, DOI:10.32604/phyton.2012.81.075

Abstract Pedicularis kansuensis is a dominating poisonous weed, and it might have allelopathic effects on other native grasses in alpine meadows. An experiment was conducted to examine a range of concentrations of aqueous whole plant extracts (25, 12.5, 2.5, 1.25, 0.25 and 0.0 g/L) of P. kansuensis, prepared at the flowering stage on seed germination and seedling growth of two native grasses (Poa pratensis and Elymus nutans). High concentrations of aqueous extracts of P. kansuensis inhibited seed germination and seedling growth of P. pratensis (p<0.05). Most aqueous extracts of P. kansuensis had a stimulatory (p<0.05) effect on E. nutans. Our results suggest that the More >

Zhang YG, HY Dai

Phyton-International Journal of Experimental Botany, Vol.80, pp. 119-125, 2011, DOI:10.32604/phyton.2011.80.119

Abstract The photosynthetic and morphological characteristics, and microstructure of roots and shoots, were studied between columnar apple and standard apple trees derived from the crosses of ‘Fuji’ × ‘Telamon’ and ‘Gala’ × ‘Telamon’. The results showed that chlorophyll A, chlorophyll B, the content of chlorophyll A+B, and leaf area index were higher in columnar apple trees than in standard apple trees. In a day cycle, the net photosynthetic (Pn) and transpiration rates (Tr) were higher in the columnar apple trees than in standard apple trees. The daily variations of Pn and Tr were of a double… More >

Martínez Corral L¹, E Martínez-Rubin², F F lores-García³, M Vázquez-Rueda³, J Frías-Ramírez², MA Segura-Castruita²

Phyton-International Journal of Experimental Botany, Vol.80, pp. 79-84, 2011, DOI:10.32604/phyton.2011.80.079

Abstract Potato (Solanum tuberosum L.) is a crop whose production yield at national level is very low compared with that in the most productive countries. This is because it is a partially automated crop with deficient and inadequate agronomic practices, low technification levels and great quantity of work wages required per hectare of cultivation. The necessity to generate technical and modern procedures that increase crop production, quality and yield has fostered development of projects leading to obtain seedlings free of pathogens with material of high genetic, physiological and sanitary quality. Utilization of a vision system for the… More >

Perissé P¹, RJ Lovey², CV Arias³, M Scandaliaris², ML Molinelli¹

Phyton-International Journal of Experimental Botany, Vol.80, pp. 73-78, 2011, DOI:10.32604/phyton.2011.80.073

Abstract Dicliptera squarrosa Nees, “canario rojo”, “coral de campo” or “ajicillo”, is a perennial native herb of the north, center and east of Argentina. It is cited as an ornamental, apiarian, emergency forage plant, and as a glyphosate-tolerant weed. The objectives were to characterize the seed and seedling of D. squarrosa and to establish the relationships with the structures that ensure its survival. The materials were treated with the conventional methodology to perform morphological studies, using stereoscopically and optical microscopy. The germination assays were carried out to determine the germination percentage and the germination type. The weight of… More >

Cervantes Ortiz F¹, G García De los Santos², A Carballo Carballo², D Bergvinson³, JL Crossa³, M Mendoza Elos¹, E Andrio Enríquez¹, JG Rivera Reyes¹, E Moreno Martínez⁴

Phyton-International Journal of Experimental Botany, Vol.80, pp. 19-26, 2011, DOI:10.32604/phyton.2011.80.019

Abstract We determined the genetic components, and the correlation between the F₁ and the F₂ generations, for traits like seed and seedling vigor using a diallel crossing design. The study involved six tropical maize inbred lines from the CIMMYT. Crosses were formed in CIMMYT’s Maize Research Station in Tlaltizapan, Morelos during the summer of 2004. In order to produce F₂ seeds, F₁ crosses were grown at Tepalcingo, Mor. and Iguala, Guerrero. This was accomplished by controlling pollinations (half sibs). Seeds from the F₁ and the F₂ crosses were evaluated at the Colegio de Postgraduados, Montecillo, Mexico. F₁ and F₂ seeds… More >

Ixtaina¹ VY y MM Mujica^1,2

Phyton-International Journal of Experimental Botany, Vol.79, pp. 95-100, 2010, DOI:10.32604/phyton.2010.79.095

Abstract The slow initial growth of Lotus tenuis limits its use to improve the Flooding Pampas grasslands by mean of its intersowing. Research on the inter and intra-population variability of seedling vigor under changing environmental conditions, and the population x environment interaction, contribute to design sowing strategies and selection criteria. The objective of this study was to evaluate the inter and intra-population phenotypic variability, under different plant densities and planting dates. Variables measured included the number of stems (Nt), and the shoot dry weight (PSa) in L. tenuis seedlings. Crown stems and PSa were determined in 5 populations… More >

Ahmad¹ S, S Gul², AKK Achakzai², M Islam¹

Phyton-International Journal of Experimental Botany, Vol.79, pp. 19-23, 2010, DOI:10.32604/phyton.2010.79.019

Abstract Seedling growth and development of Seriphidium quettense were examined under water stress (WS) and non-water stress (NWS) conditions. Seedlings were grown in pots to investigate their response to NWS conditions. Impact of WS on seedling growth was assessed in pre-existing plants grown under a semi-arid, natural environment. Seedling growth attributes were recorded on a monthly basis. Seedling growth exhibited a significant positive response under NWS conditions. Length of the main root axis at the first leaf emergence stage was 5.69 cm under NWS conditions; however, it was 4.8 cm in the natural environment (WS). At the… More >

Lovey¹ RJ, P Perissé², C V ieyra³, JC Coraglio³

Phyton-International Journal of Experimental Botany, Vol.79, pp. 5-10, 2010, DOI:10.32604/phyton.2010.79.005

Abstract Cologania broussonetii (Balb.) DC. (Fabaceae) grows from the Bolivian eastern Andes to the north west of Argentina, Cordoba hills and San Luis Province. It is recognized as a native forage. The objectives of this study were to characterize the seed, the germination and the seedling of C. broussonetii. Seed structure was characterized through free hand sections and analyzed with optical and stereoscopic microscopy. The germination assay treatments were: (1) intact non-scarfied seeds at 25 °C constant, (2) scarified seeds at 25 °C constant, (3) intact non-scarified seeds at 20-30 °C alternating, and (4) scarified seeds at 20-30… More >