parisa sheikhzadeh; Gholam Behzad; Nasser Zare; Mitra Rostami
Abstract
Objective: Due to the injuries caused by cold and frost in temperate and cold regions, utilizing strategies that increase cold tolerance to enhance the winter survival and establishment of seedlings is imperative.Methods: To investigate the effects of selenium nanoparticles application on photosynthetic ...
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Objective: Due to the injuries caused by cold and frost in temperate and cold regions, utilizing strategies that increase cold tolerance to enhance the winter survival and establishment of seedlings is imperative.Methods: To investigate the effects of selenium nanoparticles application on photosynthetic and biochemical indices and cold tolerance of oilseed rape, an experiment was carried out based on a randomized complete blocks design with three replications at the research farm station of the University of Mohaghegh Ardabili in 2018. The treatments consisted of foliar application of selenium nanoparticles (0 [control], 25, and 50 mg L-1) applied at the 6-8 leaves stage.Results: The results demonstrated that selenium nanoparticle application significantly increased the RWC, photosynthetic pigments, antioxidant enzyme activity, winter survival, and grain yields. The highest RWC, maximal flourescnece (Fm), highest photochemical efficiency of photosystem II (Fv/Fm), and variable fluorescence (Fv), proline content, and the activity of catalase and peroxidase enzymes were obtained with the foliar application of 50 mg L-1 selenium nanoparticles. Selenium nanoparticles application significantly increased the winter survival of oilseed rape plants by about 7.18 to 8.94 percent, by improving the Fv/Fm, the activity of the antioxidant enzymes, and proline content. Foliar application of 25 and 50 mg L-1 selenium nanoparticles resulted in about 28.10 and 34.19 percent increase in grain yield of oilseed rape as compared to the control (no spraying) treatment, respectively.Conclusion: In general, the results demonstrated that applying 50 mg L-1 selenium nanoparticles had positive and significant effects on the photosynthetic and biochemical characteristics of winter oilseed rape, which resulted in the increased cold tolerance of the oilseed rape plants.
kamel sajed gollojeh; Saeid Khomari; parisa sheikhzadeh mosadegh; naser sabaghnia; mehdi mohebodini
Abstract
The present research is carried out to study the effects of foliar application of Nano material and Salicylic acid (SA) on some agronomy, yield, and yield components of spring rapeseed under different water limitation treatments. For this subject an experiment has been conducted as split plot based on ...
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The present research is carried out to study the effects of foliar application of Nano material and Salicylic acid (SA) on some agronomy, yield, and yield components of spring rapeseed under different water limitation treatments. For this subject an experiment has been conducted as split plot based on a randomized complete block design with four replications at the research fields of Faculty of Agriculture and natural resource of Mohaghegh Ardabili University, during 2017 and 2018 growing years. Water limitation treatments include full irrigation (control), irrigation termination at stem elongation, flowering and seed formation stages, and foliar spray of Nano-Material in form of Nano-silicon dioxide (nSiO2) at three levels of zero (control), 60, and 300 mg.L-1 as well as salicylic acid (SA) at three levels of zero (control), 0.5, and 2.5 mM. The results of combined analysis show that the effect of year has been significant on main branch and sub branches number per plant, number of pod per plant, number of seed per pod, and seed yield traits. Water limitation has decreased all studied treats, so the foliar application improves growth traits, yield, and yield components of rapeseed plants. The highest seed yields have been 2705 and 3271 kg.h-2, in first and second experiment years, respectively, which are from applying 300 mg.L-1 with 0.5 nSiO2 and/or 2.5 mM of SA at normal irrigation (control treatment). The lowest rate belongs to non-foliar application especially at irrigation termination at stem elongation, flowering stages.