جستجوی مقالات مرتبط با کلیدواژه "triticum aestivum" در نشریات گروه "اکولوژی"

The study attempts to analyze the energy input-output relationship during Iranian wheat project from 1990 to 2005. The main sources of evidence for this investigation were obtained from the related companies and different departments of Iran Ministry of Jihad–e–Agriculture including Library. Findings revealed that total energy inputs and output have increased from 26503.5 and 20871.5 MJ ha-1 in 1990 to 35466.3 and 30259.8 MJ ha-1 in 2005, indicating a 25.27 and 31.03% increase, respectively. Averagely data collection (under both irrigated and dryland conditions), diesel had the highest share, of 37.08%, followed by electricity (21.23%), chemical fertilizers (20.21%), water (8.39%), seed (7.94%), machinery (2.33%) and human labor (2.18%), respectively. There was a significant increase in electricity usage (about 74% increase), and an associated decrease in the diesel usage (about 34% decrease) during 1990-2005 period because electric pumps replaced diesel pumps. Chemical fertilizers rose from 4353.25 to 8659.80 MJ ha-1. In the studied period, the share of nitrogen and potassium in the total fertilizer energy input increased from 72.00 to 84.79% and from 0.00 to 0.65%, respectively, while the share of phosphorus shrunk from 28.31 to 14.56%. There were not significant changes regarding the human labor and machinery annually and seedbed preparation required the maximum energy, followed by harvesting. Pesticides increased extensively in the last year under study, particularly in case of herbicides, and of which 2,4-D/MCPA and Clodinafop-propargyl had the highest share. Values of energy use efficiency (0.70-1.00), specific energy (14.70-21.04 MJ kg-1) and energy productivity (0.05-0.07 kg MJ-1) showed an intensive use of inputs not accompanied by increase in output during wheat project. Most of the total energy inputs were supplied in the non-renewable and direct forms. Also, regression analysis indicated the impact of indirect and non-renewable energy on output was statistically significant.

This article describes the results of a study on the effect of pre-sowing treatment of Triticum aestivum L. seeds with stevioside (10-8 M) for 24 h on the activity and molecular heterogeneity of lectins in seedlings at low positive temperatures. Phytolectins take part in a wide range of physiological processes in plants, regulating not only growth, but also increasing resistance to salinity, heavy metals, and temperature stress. In this regard, the study of changes in the activity and heterogeneity of these molecules in the search for new regulators of plant growth and development is urgent. The observed stevioside-induced increase in the activity of lectins bound to the cell wall and changes in their qualitative and quantitative composition against the background of temperature stress may indicate an increase in the adaptive potential of wheat plants.