Journal of Ethno-Pharmaceutical Products

Abstract Drought, as a multidimensional stress, has various destructive and adverse effects on plants and affects many morphological characteristics and physiological, biochemical and nutritional processes related to plant growth and development. This tension generates reactive oxygen species causes damage to the cell membrane. In the photosynthetic apparatus, the inhibition of electron transfer causes the reduction of the main photosynthetic pigments and protein accumulation. Wheat response to water deficit stress has many mechanisms that include cellular-molecular changes and its transfer to other metabolic activities and its effect on plant morphology. Therefore, the general purpose of this research was to investigate the interaction effect of iron oxide nanoparticles (25 nm) with two types of zinc nanoparticles (25 and 50 nm) at a concentration of 50 mg/liter on greater resistance of wheat (Arg cultivar) and improving its growth under drought stress conditions. Thus Wheat plants were treated with drought stress including two control levels and 7 days of water deficit. After applying drought treatments and the nanoparticles to the plants, some growth and pigments parameters were measured in stem, root and leaf to evaluate the effect of zinc and iron nanoparticles separately and mutually on the resistance of plants to drought stress. The occurrence of drought stress compared to the control led to a decrease in shoot length and other growth parameters. In this way, drought stress in the form of 5 days of water deprivation caused a decrease in root and stem length as well as other growth parameters such as fresh weight, dry weight, leaf water content, etc. compared to the control plants without drought stress. According to results, in conditions without drought stress, the application of both types of zinc oxide nanoparticles without or combined with iron oxide nanoparticles at the level of 5% had a significant effect.

Abstract Drought stress affects many morphological characteristics and biochemical processes related to plant growth and development. In this sense, drought, as a multidimensional stress, has various destructive effects on plants. By inhibiting the transfer of electrons, this stress creates a secondary stress in the production of reactive oxygen species, causing double damage to the cell membrane, photosynthetic pigments, and other physiological parameters. Today, the use of metal nanoparticles such as zinc and iron in improving activities and dealing with plant stresses can create beneficial effects in plant and agricultural biotechnology. The treatments include drought stress at two levels (drought stress and no drought stress) as the main factor and three levels of iron, zinc separately and integrative of iron and zinc nanoparticles. The results showed that all investigated traits were affected by drought stress conditions, so that under drought stress the fresh and dry weight. Chlorophyll a and b, decreased and the usage of iron and zinc nanoparticles reduced the effects of drought stress in mentioned growth parameters in tomato plants. Therefore, the application of the above nanoparticles can be very effective in improving the growth of tomato plants, especially in dry areas.

Abstract Cumin is one of the most agriculturally valuable plants, in the semi-arid tropical regions of Iran. In this research, drought tolerance of 49 cumin ecotypes were evaluated under irrigated, and rained conditions in the field during two years (2010 and 2011). Five drought tolerance/susceptibility indices including mean productivity (MP), geometric mean productivity (GMP), stress tolerance index (STI), tolerance (TOL) and susceptible stress index (SSI) were applied. Results of combined analysis based on the experiments showed a significant variation among ecotypes for grain yield and, it was decreased due to drought stress. The mean grain yield of Ardestan and Ravar in normal and drought stress conditions possessed the highest values respectively. According to the results derived from principal component analysis, bi-plot display and STS equation, Ravar was identified as the most drought tolerant ecotype. In conclusion, this suitable ecotype could be recommended for cropping in regions with limited water resources, also MP, GMP and STI indices were found to be more effective in identifying drought-tolerant and high yielding ecotypes in both conditions.
 
DOR: https://dorl.net/dor/20.1001.1.23833017.2021.2.1.3.3