mehdi panahyankivi; Abazar Abbasi; mahnaz mohamadzadeh nasrabadi
Abstract
Objective: The aim of this research is to investigate the effect of salicylic acid (SA) and brassinosteroid on yield and essential oil of coriander under water limitation conditions.Methods: A field experiment was conducted as a split-plot on the basis of RCB design with three replications in two agricultural ...
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Objective: The aim of this research is to investigate the effect of salicylic acid (SA) and brassinosteroid on yield and essential oil of coriander under water limitation conditions.Methods: A field experiment was conducted as a split-plot on the basis of RCB design with three replications in two agricultural seasons of 2020 and 2021. Irrigation intervals (irrigation according to 70 (control), 100, 130 and 160 mm evaporation from class A pan) were assigned to the main-plots and foliar application treatments (control, SA (1 mmol) and brassinosteroid (1 μmol) were allocated to the sub-plots.Results: The results demonstrated that the application of SA and brassinosteroid significantly increased the relative water content, the membrane stability index, and the leaf area index. SA and brassinosteroid treatments increased the number of umbels per plant (14.1 and 7.3 percent), biological (21.9 and 10.2 percent) and grain (18.6 and 9.6 percent) yield. Essential oil yield increased by 23.5 and 11.9 percent with SA and brassinosteroid, respectively. The highest water use efficiency (WUE) of grain and biological yields (0.62 and 3.95 kg/m3) was obtained from the SA treatment under irrigation after 100 mm evaporation.Conclusion: Treatment of plants with SA had a better effect compared to brassinosteroid on increasing grain yield and WUE. Therefore, under moderate and severe stress conditions (irrigation based on 130 and 160 millimeters of evaporation, respectively), the foliar application of salicylic acid can enhance the coriander's tolerance to drought stress.
Omid Sadeghipour
Abstract
In order to investigate the role of methyl jasmonate on salinity tolerance of cowpea, a factorial pot experiment was conducted in the basis of completely randomized design with three replications in the Rey region in 2015. Treatments included three levels of seed soaking in methyl jasmonate solution ...
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In order to investigate the role of methyl jasmonate on salinity tolerance of cowpea, a factorial pot experiment was conducted in the basis of completely randomized design with three replications in the Rey region in 2015. Treatments included three levels of seed soaking in methyl jasmonate solution (0, 25 and 50 µM) for 20 hours and three levels of salinity (0, 50 and 100 mM NaCl). The results showed that by increasing salinity levels, lipids peroxidation, antioxidant enzymes activity (superoxide dismutase, catalase, ascorbate peroxidase and glutathione reductase) and Cl- concentration in the leaves increased, while the concentration of N, Ca2+ and Mg2+ decreased as well as K+/Na+ ratio. These changes eventually led to decreasing seed yield. Seed treatment with methyl jasmonate had not significantly effect on any measured traits under normal conditions, however this treatment (especially 50 µM) under salinity stress conditions caused further activity of antioxidant enzymes, declining lipids peroxidation, reducing the concentration of Cl- in the leaves, increasing the concentration of N, Ca2+ and Mg2+ as well as K+/Na+ ratio, and finally improved seed yield. These findings suggest that methyl jasmonate plays a pivotal role in inducing salinity tolerance of cowpea plants via enhancing antioxidant enzymes activity and altering nutrients composition.
Maryam Tatari; Seyed Asghar Mousavi
Abstract
According to problems caused by application of non-uniform seedling rootstocks in stone fruit treesorchards, the use of uniform and consistent rootstocks with these trees is essential. For determination ofthe best culture medium, explants of apical and lateral buds of Tetra, Nemaguard and GF677 rootstockswere ...
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According to problems caused by application of non-uniform seedling rootstocks in stone fruit treesorchards, the use of uniform and consistent rootstocks with these trees is essential. For determination ofthe best culture medium, explants of apical and lateral buds of Tetra, Nemaguard and GF677 rootstockswere prepared. Explants were placed in modified MS, WPM and Knop media each containing 0.6 mg/lBAP and 0.01mg/l NAA in mid-Spring and after disinfection. This research was carried out as factorialexperiment in a completely randomized design with four replicates and four observations per eachreplication. Tetra, GF677 and Nemaguard rootstocks produced the highest of plantlet numberrespectively. Nemaguard rootstock did not show any proliferation in Knop medium and Nemaguardexplants showed chlorosis on this medium. This medium caused chlorosis in produced plantlets of Tetraexplants. Explants of every three rootstocks were produced the highest plantlet number and length in MSmodified medium. Therefore, combinations of plant growth regulators were evaluated in this medium.Three different combinations were evaluated. Among different combinations of plant growth regulators(0.8 and 1 mg/l BAP and 0.1 and 0.5 mg/l NAA), the highest plantlet number and length were producedin MS medium containing 0.6mg/l BAP and 0.01mg/l NAA. Increase of plant growth regulatorsconcentrations led to vitrification and callus production in GF677 rootstock. The highest root number androoting percent were achieved in modified MS medium containing 1 mg/l NAA and explants of Tetrarootstock produced the highest root number and length.