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. ...
Read More
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.
Azam Ranjbar; Nourollah Ahmadi
Abstract
This research was conducted to evaluate the effects of 1-MCP and ethylene on extending the display quality and increasing vase life of cut carnation flowers in a completely randomized design with three replicationsat the laboratory of the postharvest physiology, Tarbiat Modares Universityin 2014. First, ...
Read More
This research was conducted to evaluate the effects of 1-MCP and ethylene on extending the display quality and increasing vase life of cut carnation flowers in a completely randomized design with three replicationsat the laboratory of the postharvest physiology, Tarbiat Modares Universityin 2014. First, cut flowers were treated with 0, 0.5, 1 and 1.5 µl l-1 of 1-MCP for 24 h and then exposed to 1 µl l-1 ethylene for 16 h. The results showed that 1-MCP had significant effect on the physiological and biochemical characteristics and the activity of antioxidant enzymes. Maximum of vase life and the amount of chlorophyll and anthocyanin were revealed in samples treated with 1 µl l-1 1-MCP. Also, the highest peroxidase enzyme activity was observed in treatment of 1 µl l-1 1-MCP which had significant difference with other treatments. The highest and lowest catalase and superoxide dismutase activities were found in 1.5 µl l-1 1-MCP and control, respectively. In conclusion, 1-MCP treatment resulted in extending vase life and increasing activity of antioxidant enzymes in cut carnation cv. ‘Grand Slam’ by suppression of ethylene action.
Alireza Khaleghi; Rohangiz Naderi; Alireza Salami; Mesbah Babalar; Iman Roohollahi; Gholamreza Khaleghi
Abstract
Drought is one of the most important environmental factors which limit the growth of woody plants. Iran is located in arid and semi-arid area therefore the growth and cultivation of ornamental trees and shrubs were limited. For this purpose, effect of foliar-applied salicylic acid and/or spermidine (0, ...
Read More
Drought is one of the most important environmental factors which limit the growth of woody plants. Iran is located in arid and semi-arid area therefore the growth and cultivation of ornamental trees and shrubs were limited. For this purpose, effect of foliar-applied salicylic acid and/or spermidine (0, 100, 500 and 1000 µmol) on reduce drought stress injuries of one-year seedlings ofOsage orange (Maclura pomifera) was examinedat the Horticultural Research Station, University of Tehran, in 2013.This study was conducted as a factorial based on completely randomized design with three replications. First, PGRs were foliar-applied for two consecutive days in during the early morning and the late afternoon and then plants were droughted by withholding water for 10 days. The damaging effects of drought on membrane leakage were reversed by low concentrations of salicylic acid and/or spermidine. Also, salicylic acid and spermidin at a concentration of 100 µmol stimulated catalase and superoxide dismutase activity, enhanced proline and chlorophyll content and maintained photochemical efficiency of chlorophyllunder drought stress. But Spermidine and salicylic acid at high concentrations were ineffective and/or inhibitors. Finally, our results showed that 100 µmol salicylic acid and/or spermidine maybe the best concentration for increasing of drought tolerance in young seedling, especially during transplanting and planting in permanent location.
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 ...
Read More
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.
Zobeydeh Alborz; Friborz Habibi; Seyed Najmadin Mortazavi
Abstract
In order to study the effect of pre and postharvest polyamines spraying on increasing vase life of alstroemeria (Alstroemeriaaurantica cv.Sukari), an experimental was conducted on completely randomized factorial design with two types polyamines (putrescine, spermine) in four levels (zero, five, 10, 15 ...
Read More
In order to study the effect of pre and postharvest polyamines spraying on increasing vase life of alstroemeria (Alstroemeriaaurantica cv.Sukari), an experimental was conducted on completely randomized factorial design with two types polyamines (putrescine, spermine) in four levels (zero, five, 10, 15 and 20 mg/l). Results showed that, 20 mg/l of putrescine and spermine treatments increased vase life to 19 and 20 days, and 10 mg/l increased vase life to 14 and 18 days, respectively. Putrescine and spermine treatments had a significant effect on leaf chlorophyll index in three stages of sampling. In the first stage of sampling, 20 mg/l putrescine concentration and 10 and 20 mg/l spermine concentration had a significant effect on fresh and dry weight. Concentrations of putrescine and spermine (10 and 20 mg/l) significantly increased catalase enzyme activity in the first and second stage of sampling and spermine effect was more than putrescine. Treatment of 20 mg/l spermine significantly increased superoxide dismutase enzyme activity and increased its activity until third stage of sampling. Putrescine and spermine significantly decreased chlorophyllase, pectinase and phenoloxidase and best treatment was 20 mg/l spermine. Treatments of putrescine and spermine (10 and 20 mg/l) had significant effect on increasing membrane resistance in the first and second stage of sampling. According to results it can be said that, spermin 20 and putrescine 10 mg/l had most effect on increasing vase life and decreasing senescence of alstroemeria flowers. Spermin was more effective than putrescine in increasing vase life of alstroemeria flowers