Mehrdad Mahlooji; Raouf Seyed Sharifi
Abstract
An experiment was carried out to determine the effects of chelated zinc and nanoscale zinc oxide particles on tolerance salinity of barley. In the experiment, barley seeds were treated with different concentrations of chelated zinc (Zn-Chelated) and nanoscale zinc oxide (Nano-ZnO), and the effects of ...
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An experiment was carried out to determine the effects of chelated zinc and nanoscale zinc oxide particles on tolerance salinity of barley. In the experiment, barley seeds were treated with different concentrations of chelated zinc (Zn-Chelated) and nanoscale zinc oxide (Nano-ZnO), and the effects of these treatments on seed germination, seedling vigor, plant growth, grain filling, and yield were studied. The inhibitory effect of nanoparticles and chelated zinc (1.5 ppm) was discovered.The results emphasize that water can be supplied to the barley followed by Zn-Chelated application with 0.5 ppm to get the desired results. With increasing salinity stress, seed germination and seedling vigor decreased sharply, so the highest obtained from control treatment and the lowest obtained from a salinity level of 18 dS m-1. The genotypes respond differently to salinity levels and alkaline soils. It seems that the Khatam genotype has more tolerance to salinity conditions. Consequently, an experiment was conducted in a strip-plot design with three replications. Based on the correlation coefficients, the kernel number per spike (KNS) showed the highest correlation with the grain yield in barley genotypes, followed by grain filling rate (GFR), maximum grain weight (MGW), thousand-kernel weight (TKW), number of spikes (NS), and saturation water deficit (SWD), respectively. Thus, not only a higher KNS and TKW, but also GFR, MGW, and proline in aboveground plant parts are crucial for successful tolerance in barley. These findings indicate that these agrophysiological traits could be key factors and useful tools for screening many samples in a short time.
Abbas Nasiri Dehsorkhi; Hassan Makarian; Mehrdad Mahlooji; SeyedHassan Mirhashemi; Siavash Bardehji; Sima Sadat Seyedi; Navid Kargar Dehbidi
Abstract
An experiment was conducted at the Faculty of Agriculture, Shahrood University, as a randomized complete block design with four replications to investigate the effect of ultrasonic waves and seed priming on some quality traits of cowpea under soil application of trifluralin. Nine treatments were: T1: ...
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An experiment was conducted at the Faculty of Agriculture, Shahrood University, as a randomized complete block design with four replications to investigate the effect of ultrasonic waves and seed priming on some quality traits of cowpea under soil application of trifluralin. Nine treatments were: T1: control, T2: ultrasonic waves, T3: ultrasonic waves + reduced herbicide dose (1 L ha-1), T4: ultrasonic waves + recommended herbicide dose (2 L ha-1), T5: hydro-priming, T6: hydro-priming + reduced herbicide dose, T7: hydro-priming + recommended herbicide dose, T8: reduced herbicide dose, T9: recommended herbicide dose. The results showed that the effect of treatments was significant on all traits except leaf phosphorus. The maximum chlorophyll a (1.30 mg g-1 FW), carotenoid (1.82 mg g-1 FW), leaf relative water content (79.9 %), and leaf nitrogen (3.97%) were obtained in ultrasonic treatment, which resulted in a significant increase of 28.7, 22.1, 7.9, and 18.5 percent, respectively, in comparison to the control. In comparison to the ultrasonic treatment, ultrasonic waves + recommended herbicide dose reduced chlorophyll b, RWC, and leaf nitrogen by 29.3, 21.1, and 35.3 percent, respectively. In comparison to herbicide application alone, the combination of ultrasonic waves and the recommended herbicide dose reduced chlorophyll a and total chlorophyll by 29.7 and 22.2 percent, respectively. Overall, the results of the present study showed that pretreating cowpea seeds with ultrasonic waves could increase photosynthesis pigments, relative water content, and leaf N (in the absence of herbicide use).
Mehrdad Mahlooji; Abas Nasiri Dehsorkhi
Abstract
Salinity is one of the most important abiotic stresses because it causes zinc to precipitate in an unusable form for plants and is influenced by saline-calcareous soils. This experiment was carried out in a strip split block design with three replications at the Esfahan Rodasht Drainage and Salinity ...
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Salinity is one of the most important abiotic stresses because it causes zinc to precipitate in an unusable form for plants and is influenced by saline-calcareous soils. This experiment was carried out in a strip split block design with three replications at the Esfahan Rodasht Drainage and Salinity Research Station to investigate the effects of agrophysiological responses of barley genotypes to zinc fertilization and water saline irrigation. As vertical factors, water irrigation quality at three levels, 2, 10, and 18, dS/m, were used. Fertilizer application included Nano zinc-oxide, zinc-chelate, a mixture of Nano zinc-oxide and zinc-chelate, and water as a control. Within vertical factors, three different barley genotypes are arranged, including Morocco (moderate semi-sensitive), Nosrat (moderate tolerant), and Khatam (tolerant). The results showed that the application of Zn-chelate fertilizer resulted in the highest grain yield, K+ concentration, and K+/Na+ ratio in shoots. In Khatam, stomatal conductance (gs), the maximum quantum efficiency of PSII (Fv/Fm), K+ and Zn2+ concentrations, and the K+/Na+ ratio were all higher than in Morocco. In comparison to Morocco, Khatam had lower Na+ and Ca2++Na+ contents. Furthermore, as salinity stress increased, all barley genotypes showed a decreasing trend in K+ content and the K+/Na+ ratio in shoots.
Ramin Rowshani; Ali Solymani; Mehrdad Mahlooji; Mohammad Reza Naderi
Abstract
Salinity is one of the most important abiotic stresses and variables restricting the successful production of plant products around the world, with negative consequences for plant development and other metabolic processes. The effect of nutrient management (control, 0.5 percent K2SO4, 0.5 percent ZnSO4, ...
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Salinity is one of the most important abiotic stresses and variables restricting the successful production of plant products around the world, with negative consequences for plant development and other metabolic processes. The effect of nutrient management (control, 0.5 percent K2SO4, 0.5 percent ZnSO4, and 1.5 Mm salicylic acid) on physiological parameters, antioxidant activities, and grain yield responses of three barley (Hordeum vulgare L.) cultivars (Armaghan, Goharan, and Mehr) were examined under salinity stress (1 and 12 dS/m of salinty). Salinity stress considerably lowers growth, yield components, and grain yield, according to the findings. The number of grains per spike and 1000-grain weight of all cultivars tested increased after foliar application of salicylic acid. ZnSO4, K2SO4, and salicylic acid influenced grain and biological yields. At a salinity of 12 dS/m, foliar treatment of ZnSO4, K2SO4, and salicylic acid boosted peroxidase, superoxide dismutase, ascorbate peroxidase, and catalase while decreasing hydrogen peroxidase and malondialdehyde. Under the influence of foliar application, the relative water content increased by 12 percent, while the leaf water potential dropped by 8 percent. Salicylic acid treatment had a stronger impact on Mehr cultivar yield and physiological parameters than ZnSO4 or K2SO4. These findings revealed that under the impact of salicylic acid, the Mehr cultivar was more appropriate than other cultivars.
