Showing 4 results for Methyl Jasmonate
F. Salimi, F. Shekari, M. R. Azimi , E. Zangani,
Volume 4, Issue 11 (4-2014)
Abstract
To evaluate the effect of spraying with methyl jasmonate on some morphological characters and flower dry weight of chamomile under salt stress an experiment was conducted at greenhouse. The experimental design was as factorial based on a randomized complete block design. Spraying with methyl jasmonate at five levels including, 0, 75, 150, 225 and 300 μM and salt stress applied at four levels including 2.1, 6, 10 and 14 dS/m by adding NaCl to each pots soil. The results showed that spraying with methyl jasmonate and salinity stress had significant effects (P≤ 0.05) on all measured traits. Application of methyl jasmonate in 75 µM and salinity in 6 dS/m leads the highest leaf area, S/R ratio, flower dry weight, length of shoot, biomass, stem diameter, branch numbers. The lowest, root length was recorded in 75 µM and 14 dS/m salinity treatment. According to the results, mild salinity (6dS/m) and low levels of methyl jasmonate in German chamomile had positive effects on morphological traits and flowers performance.
Y. Moradmand, M. Mobli, A. A. Ramin,
Volume 5, Issue 16 (9-2015)
Abstract
Among the chemicals that their effects on reducing chilling injury has recently been studied are salicylates and jasmonates. Therefore, in this study the effects of salicylic acid and methyl jasmonate on increasing the cold tolerance of bell pepper cv. Emily was examined. Experiment was done as a 7×2 factorial in the completely randomized design (CRD) with four replications. The first factor contained salicylic acid in three concentrations of 0.1, 0.5 and 1 mM and methyl jasmonate at the rates of 0.001, 0.01 and 0.1 mM plus control (distilled water) and the second factor involved application of hormone, spraying whole plant and soil drenching. Treatments were applied at 7-9 leaves stage. After application of hormones, plants moved to 0º C for 3 days and then returned back to greenhouse temperature. Three days later different attributes were measured. Results showed that except for soluble sugars and leaf proline, there was no significant differences between two methods of hormone application. For all traits, application of hormone showed significant effects but due to significant interactions between hormone and application method, the effect of hormone treatment depended on the method of application. Drenching 0.5 mM salicylic acid reduced chilling injury (necrotic lesions) and increased quantum efficiency of PSII (Fv/Fm), chlorophyll content, soluble sugars and leaf proline, compared to untreated plants, thus improved cold tolerance. Methyl jasmonate in the rate of 0.01 mM reduced chilling injury and increased Fv/Fm in comparison with control, but only when it was used as drench it increased concentrations of chlorophyll a and b and soluble sugars and cold tolerance compared to other two concentrations.
M. H. Shirzadi, A. Bideshki,
Volume 8, Issue 2 (8-2018)
Abstract
Drought stress is the most important factor which negatively effects the plant growth and crop productivity in arid and semi-arid areas. Therefore, in a field experiment, the effect of Salicylic acid (0, 0.5 and 1mM) and Methyl jasmonate (0, 5 and 10µM) was studied on growth parameters and bulb yield of a Primavera cultivar onion under water stress conditions in 2015. The results showed that drought stress significantly reduced and SA and MJ increased all measured traits. Interactive effects of MJ × drought stress and SA × drought stress was significant on plant fresh weight, chlorophyll a, b and total, and carotenoids concentrations, relative water content, bulb length and diameter and plant height. Interaction of drought stress × methyl jasmonate × salicylic acid on the leaf number, plant dry weight, ionic leakage and the final bulb yield was significant and the highest bulb yield was obtained in non-stress condition treatment and combined 0.5 mM salicylic acid and 10µM methyl jasmonate. The highest bulb yield in drought stress conditions was obtained when plants were exposed to 1mM salicylic acid and 10µM methyl jasmonate treatment.
A. Mahmoodi Pour, M. Esna-Ashari, O. Karami, M. Hesari,
Volume 12, Issue 45 (10-2008)
Abstract
Resveratrol (5,3,4'- trihyroxystilbene) is a valuable polyphenolic compound which prevents cancer, heart and vascular diseases in human. In this research, the compound was extracted from leaf and fruit tissues of two Iranian grape cultivars (Rajabie Sefide Shiraz and Keshmeshie Ghermez) using a general extraction method with some modification, and analyzed quantitatively by High Performance Liquid Chromatography (HPLC). Resveratrol content in leaf and fruit of Rajabie Sefide Shiraz cultivar was higher than Keshmeshie Ghermez and its amount in the fruits of both cultivars was observed to be greater than their leaves. The accumulation of Resveratrol at the early stage of fruit growth (4 weeks after full bloom) was higher than the subsequent stages of fruit growth and development (8 weeks after full bloom and ripened fruit) in both cultivars. This compound gradually decreased from the beginning of fruit set to the complete stage of growth and development and reached the lowest level when the fruits were ripe. Leaves and fruits of both cultivars were treated with methyl jasmonate (1 mM), then the rate of resveratrol was measured after treatments. It was observed that the amount of this compound was significantly increased in treated samples when compared with the control however, the difference diminished later. The fruits of both cultivars responded better to the treatments 4 weeks after full bloom.
