This study presents the variability of some biochemical indicators in the winter wheat assortments tested in south-western Oltenia (Romania) and identification of the sources showing a high antioxidant activity. The peroxidase activity has intensified as the stress induced by treatment with PEG of different concentrations and in different doses increased. Regarding the peroxidase content, among the varieties treated with PEG 10,000 25%, the majority of the Romanian varieties tested showed higher values of the PEG/control treatment ratio, which suggests tolerance to drought. In reverse, the activity of ascorbate peroxidase is lower in tolerant varieties. The varieties with a subunit report have been noted. Among them are the Izvor variety, known as the drought-tolerant variety, as well as other Romanian varieties: Alex, Delabrad, Lovrin 34, etc. An increased activity of catalase was present in most varieties, so there is the possibility of drought tolerance. Among the varieties highlighted are Romanian varieties (Dropia, Trivale, Nikifor, etc.) but also foreign varieties (Kristina, GH Hattyu, Karlygash, etc.). However, the correlation between yield index in the limited assortment and the antioxidant enzyme content ratios between PEG and control treatments does not exist, suggesting that none of these biochemical indicators are a selective indicator for drought tolerance under the experimental condition.

Wheat has a great importance as a food product, providing a large part of the carbohydrates and proteins needed by humans and representing more than half of the calories consumed by mankind. The nutritional importance of wheat and its beneficial effects on human health have been emphasized in many studies, both in agricultural and medical fields.In the current climate conditions and the predicted changes, as a result of the global warming phenomenon, drought resistance is a priority objective of wheat breeding programs. A decrease in soil water potential due to drought decreases the mitotic activity and rate of leaf expansion.This study presents some results regarding the mitotic activity (MA) in some varieties of wheat (Triticum aestivum) grown in experiences set up at SCDA Caracal (Romania). Water stress caused a decrease of MA in al genotypes and changes in cell wall integrity. The mitotic index (MI) was an efficient index for detecting the mitotic activity deterioration process, which ranged from 9.2 to 17.6%. There was also some alterations of normal mitosis and appearance of some chromosomal and nuclear abnormalities in wheat cells (disorganized cells, chromosome fragmentation, sticky chromosomes, unequal anaphase, ghost nucleus, etc.), with values ranging from 7.15 to 26.08%.These results suggest a reduction of mitotic activity and increase of oxidative stress in wheat under drought conditions.

Human (anthropogenic) influence, mostly generalized industry, intensive conventional agriculture, traffic and others, causes the increase of concentration of greenhouse gases to a level by which significantly more heat is radiated back to the earth than it was in the initial state. This is how climate warming occurs. At the international level, periodic inventories are carried out that show the fact that the biosphere absorbs, approximately, half of the anthropogenic CO2 emissions, and at the terrestrial level, the carbon source and reserve is given by the northern hemisphere.This study presents some results from the literature regarding the methods of C emissions reduction and its sequestration per surface unit, i.e. per hectare of agricultural crops, to increase the contribution of agriculture to environmental depollution. The used methods included searching of databases, such as Web of Science or Google Scholar, in order to identify some relevant results.Reducing CO2 emissions can be achieved through biological, chemical and technological options, either by reducing or sequestering them.