Dariush Talei; Reza Sharifi; Mahdi Pirsalehi
Abstract
In order to investigate the morpho-physiological responses of Purslane plant to methyl jasmonate under salinity stress a split plot based on a completely randomized design with two factors and three replications was carried out in medicinal plants research center, Shahed University, Tehran during 2017. ...
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In order to investigate the morpho-physiological responses of Purslane plant to methyl jasmonate under salinity stress a split plot based on a completely randomized design with two factors and three replications was carried out in medicinal plants research center, Shahed University, Tehran during 2017. The factors were, salinity with four levels (0, 3, 6 and 9 dS/m) as a main factor and methyl jasmonate with four levels (0, 0.25, 0.5 and 0.75 mM) as a sub factor. The results showed that by increasing salinity levels, the growth indices such as root length, fresh weight of root, chlorophyll b, total chlorophyll and the amount of superoxide dismutase decreased, while by increasing the salinity levels the proline content and the activity of catalase and MDA in the leaf increased. Applying methyl jasmonate under salinity stress reduced the growth indices and photosynthetic pigments. The highest number of branches, number of leaves and chlorophyll b was obtained at 6 dS/m salinity and 0.5 mM methyl jasmonate. By increasing methyl jasmonate level, the proline content and the activity of CAT increased, while the amount of MDA and SOD enzymes decreased. Therefore, it can be concluded that the is the tolerance of Portulaca oleracea plant to salinity was up to six dS/m, and consuming low amounts of methyl jasmonate can improve yield and physiological indices in Purslane.
Sona Mozaffari; Sarah Khorasaninejad; hossein gorgini shabankareh
Abstract
In order to study the effects of irrigation regimes and humic acid applications on some of physiological and biochemical characteristics of Portulaca oleracea L., a greenhouse experiment was conducted as factorial based on completely randomized design with three replications at the research greenhouse ...
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In order to study the effects of irrigation regimes and humic acid applications on some of physiological and biochemical characteristics of Portulaca oleracea L., a greenhouse experiment was conducted as factorial based on completely randomized design with three replications at the research greenhouse of plant production faculty of Gorgan University of Agricultural Sciences and Natural Resources, during of 2014-15. The factors were irrigation regimes including four levels: (25, 50, 75 and 100 percent of field capacity) and four concentrations of humic acid: (0, 200, 400 and 600mg/L). Traits evaluated were proline, RWC, total phenol, flavonoid, antioxidant, soluble carbohydrate and carotenoid content. The results showed that the treatments had significant effects on all the studied traits. Irrigation regimes had significant effect on proline, total phenol, flavonoid, antioxidant, soluble carbohydrate. The highest level of irrigation regimes (25 percent FC) increased proline and decreased RWC and carotenoid. Humic acid had significant effect on all traits except of carotenoid content that were the highest in 400 mg/L humic acid. Interaction effect of humic acid and irrigation regimes was significant for all traits except for total phenol. Irrigation regimes increased antioxidant (12.34%), soluble carbohydrate (36.9%), in 25% and 50% FC, respectively. Generally, the best of treatments is 400mg/L humic acid and 25percent FC, economically. Because the highest yield achieved with low water and humic acid.
Fatemeh Salarpour Ghoraba; Hasan Farahbakhsh
Abstract
To investigate SA effects on physiological and biochemical characteristics of fennel (Foeniculum vulgare Mill) under water deficit, a split plot experiment based on latin square design with three replications was carried out at research farm of Shahid Bahonar University of Kerman in 2012. Three levels ...
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To investigate SA effects on physiological and biochemical characteristics of fennel (Foeniculum vulgare Mill) under water deficit, a split plot experiment based on latin square design with three replications was carried out at research farm of Shahid Bahonar University of Kerman in 2012. Three levels of water deficit (50, 75 and 100 percent of field capacity) and 3 concentrations of SA (0, 0.5 and 1mM) were considered as main and sub plots, respectively. Foliar application of SA was performed at 3 to 4 leaves growth stages and before application of Irrigation. The obtained results showed that water deficit reduced grain yield, essential oil content and percentage while the amount of superoxide dismutase and guaiacol peroxidase increased significantly compared to control. Increasing in concentration of salicylic acid led to a significant increase in grain yield, essential oil content, essential oil yield, superoxide dismutase and guaiacol peroxidase compared to control. Interaction of water deficit and SA on grain yield, essential oil yield and antioxidant enzymes were significant. Increasing in antioxidant enzymes indicates reduction in oxidative damage and implies SA roles in tolerance of fennel under water deficit.