Khan A¹, I Ahmad¹, A Shah¹, F Ahmad², A Ghani¹, M Nawaz¹, F Shaheen¹, HU Fatima¹, F Pervaiz¹, S Javed¹, F Hayat¹, H Nawaz¹, R Zubair¹

Phyton-International Journal of Experimental Botany, Vol.82, pp. 281-287, 2013, DOI:10.32604/phyton.2013.82.281

Abstract Salinity adversely affects physiological and biochemical processes in plants. Plants might have different methods to decrease the harmful effects of salinity, such as the accumulation of osmolytes and antioxidant compounds. An experiment was conducted in the Department of Biological Sciences, University of Sargodha, Pakistan to determine the effect of different levels of phosphorus (P) on wheat under saline conditions. Data of shoot and root fresh and dry weights, chlorophyll contents, different ion accumulation and yield components of wheat were collected. When different levels of phosphorus were applied on wheat plant under saline conditions, phosphorus reduced the effect of salinity. Applications… More >

Pereira JR¹, AE Duarte², JB Pitombeira³, MAP da Silva², NE de M Beltrão¹, LM Barros²

Phyton-International Journal of Experimental Botany, Vol.82, pp. 275-279, 2013, DOI:10.32604/phyton.2013.82.275

Abstract An experiment was conducted in dryland conditions of the Brazilian Northeast to determine the number of viable weed seeds (seedbank) in an upland cotton crop, and its distribution in the soil profile, before and after using various herbicide treatments. A randomized block design in a split-plot block scheme with 6 replications was used, where the main plots were constituted by a factorial (13 treatments and 2 sampling soil depths), and the subplots by 2 sampling dates. The seedbank was determined by germination of the recovered weed seeds obtained from different soil depths. The highest number of viable weed seeds in… More >

Miravalles MT¹, MN Fioretti¹, H Mirassón², ML Faraldo², L Möck¹, RE Brevedan¹

Phyton-International Journal of Experimental Botany, Vol.82, pp. 263-273, 2013, DOI:10.32604/phyton.2013.82.263

Abstract In the present study the effects of three tillage systems: conventional (CT), vertical (VT) and direct drilling (DD) on three bread wheat varieties of different cycle length, were studied, for yield and yield components. Their influence on grain quality, expressed through thousand kernel weight (TKW, g), test weight (TW, kg/hL), grain protein content (GPC, %) and yellowberry percentage (YBP, %) were also studied. The highest average yield was under CT and DD, while the lowest was under VT. The lowest dry matter accumulation and one third fewer spikes per unit area were determined under VT. Concerning grain quality, a comparatively… More >

Orona Castro F¹, J Medina Méndez¹, FM Tucuch Cauich¹, JM Soto Rocha¹, IH Almeyda León²

Phyton-International Journal of Experimental Botany, Vol.82, pp. 255-261, 2013, DOI:10.32604/phyton.2013.82.255

Abstract We conducted a comparative study from 2008 to 2011 to study the adaptability and stability of grain yield of upland rice in two regions of Campeche, Mexico. The individual and combined statistical analysis, showed highly significant differences in grain yield of different genotypes in both regions. The experimental error variance was uniform, both effects of repetition/location and variety/location were highly significant. The results of analysis for grain yield stability parameters showed highly significant effects for 12 treatments, and significant for one. Eighteen genotypes showed a significant variation in the effects of deviation from the regression parameters of stability. The highest… More >

Castro Nava S

Phyton-International Journal of Experimental Botany, Vol.82, pp. 249-254, 2013, DOI:10.32604/phyton.2013.82.249

Abstract Identification of plant tolerance to heat requires novel strategies for measuring plant responses to this stress. Leaf electrolyte leakage is an indirect method that can be utilized as selection criteria for heat tolerance in plants, but it has to be adapted to each species. The objectives of this study were to measure heat-induced leaf electrolyte leakage in corn and bean to determine heat tolerant genotypes, and also to establish the optimal developmental stage for use of electrolyte leakage as selection criteria. This study included two genotypes of corn (Zea mays L.), and other two of bean (Phaseolus vulgaris L.), measured… More >

Li G, FT Yang, XL Jiang, FX Chen, TH Cao, LC Wang

Phyton-International Journal of Experimental Botany, Vol.82, pp. 243-247, 2013, DOI:10.32604/phyton.2013.82.243

Abstract The aim of this study was to evaluate the impact of the plow pan on the production of spring corn. We evaluated SPAD values and chloroplast ultrastructure in premature ear leaves of spring maize at the grain-filling stage. The maize plants were grown in simulated plow pan or simulated subsoiling treatments. Plants in the simulated plow pan treatment showed irreversible damage to chloroplasts, including changes in chloroplast shape, disintegration and rupture of chloroplast membranes, and blurriness and cloudiness of grana lamellae. The chlorophyll content decreased, which is a typical characteristic of senescence. Subsoiling cultivation practices resulted in chloroplasts with a… More >

Ocampo Ocampo T¹, DL Ochoa Martínez¹, S Ramírez Rojas², G Valdovinos Ponce¹, C Nava Díaz¹

Phyton-International Journal of Experimental Botany, Vol.82, pp. 235-241, 2013, DOI:10.32604/phyton.2013.82.235

Abstract The Instituto Nacional de Investigaciones Forestales, Agrícolas y Pecuarias (INIFAP), in Zacatepec Morelos, started a genetic improvement program of wild and semi-cultivated poinsettia plants ("nochebuena de sol"). It is important to generate a phytosanitary database that allows the release of new varieties and hybrids that provide tolerance to the major pathogens reported in cultivated poinsettia plants. The phytosanitary status of the “nochebuena de sol” plants is not available in Mexico, so the objective of this research was to generate preliminary data about viruses associated to these materials. Based on DAS-ELISA and RT-PCR results, we reported the presence of the Tobacco… 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 and SB, diluted… More >

Méndez-Aguilar R¹, MH Reyes-Valdés², N Mayek-Pérez³

Phyton-International Journal of Experimental Botany, Vol.82, pp. 215-226, 2013, DOI:10.32604/phyton.2013.82.215

Abstract Common bean was originated in México, and it is the most important protein source for millions of Mexicans, mainly those with low economic incomes. Grain yield of this crop is mainly affected by several fungal, bacterial and viral diseases. Among them, there are root rot diseases caused by the genera Macrophomina and Fusarium sp. Currently, some molecular biology tools such as DNA molecular markers are being used successfully to develop genetic maps where QTLs and major molecular markers are located, which are linked to genes that confer resistance to these fungi. The importance of the development of genetic maps is… More >

Martínez ME¹, JM Lesher G², G Castañón N², E de la Cruz L¹, C Zapata H²

Phyton-International Journal of Experimental Botany, Vol.82, pp. 209-214, 2013, DOI:10.32604/phyton.2013.82.209

Abstract Nanche (Byrsonima crassifolia (L.) H.B.K.) grows in the southeastern region of the Mexican republic under both wild and semi-cultivated forms. Despite the importance of the fruit of this tree, only one paper at the molecular level has been published in Mexico, and possibly in America, to date. For this reason, the purpose of this research was to study the genetic variability of nanche trees that grow under both wild and semi-cultivated conditions in the state of Tabasco, Mexico. Molecular determinations were carried out in the Laboratorio de Genómica of the División Académica de Ciencias Biológicas (DACBiológicas), Universidad Juárez Autónoma de… More >