جستجوی مقالات مرتبط با کلیدواژه "jasmonic acid" در نشریات گروه "زراعت"

In order to investigate the effect of different foliar application treatments on the biochemical and antioxidant traits of wheat genotypes under different moisture conditions, a factorial split plot experiment was conducted on the basis of a randomized complete block design with three replications in two locations. The main factors of irrigation (normal and water deficit) and the secondary factors were four levels of foliar application (control (without foliar application), jasmonic acid, zinc nano chelate, and succinate) and three different genotypes of barley. The results showed that water deficit stress reduced the content of chlorophyll a, chlorophyll b total compared to normal irrigation conditions by 9.03%, 6.66%, and 7.32%, respectively, and increased the activity of superoxide dismutase, catalase, and glutathione reductase enzymes by 3.29, 3.48 and 50.90 percent respectively. Foliar application of nano chelate increased the amount of chlorophyll a, chlorophyll b, and total, as well as superoxide dismutase, catalase, and glutathione reductase enzymes, 15.45, 15.76, 14.70, 52.63, and 48.14 percent respectively compared to the control. Mihan cultivar had the highest content of photosynthetic pigments and the lowest activity of antioxidant enzymes. The results showed that foliar application of nano-chelate increased the content of proline, glutathione reductase, and grain yield compared to the control treatment in both normal irrigation and water deficit conditions. Also, foliar application of nano zinc chelate in the Mehen cultivar could produce the highest grain yield and the lowest amounts of proline, glycine betaine, and malondialdehyde. Among the irrigation interaction treatments, line 9 had the highest glycine betaine content in both conditions. It can be stated that foliar application of zinc nano-chelate, along with the appropriate variety, can be a solution to improve seed yield under different environmental conditions.

Various strategies have been used to improve growth and productivity of crops through genetic approach, genetic engineering, and breeding. However, economic feasibility and ease of use can pave the way for the application of priming techniques as "stress relievers" in agricultural production. The aim of this study was to evaluate the ability of priming Catharanthus roseus seed with phytohormones of salicylic acid and Jasmonic acid under drought stress to reduce the effect of water limitation during the germination.

Two separate studies were conducted as a factorial experiment based on a completely randomized design with three replications at the Laboratory of Seed Science and Technology of Shahed University, Tehran. In the first experiment, treatments included priming in two levels of SA (0.5 and 1mM) and priming duration in two levels (24 and 48 hours), and drought stress with polyethylene glycol 6000 in 6 levels (0, 0.1, 0.5, 1, 1.5 and 2 Mpa). In the second experiment, treatments included JA (10 µM), priming duration in two levels (12, and 24 hours) and drought stress in levels six (0, 0.1, 0.5, 1, 1.5, and 2 Mpa). Dry seeds (without pretreatment) were considered as control.

In this study, drought stress treatments -1.5 and -2 Mpa in the first experiment and -1, -1.5 and -2 Mpa in the second one had no germination. Seed priming with SA and JA improved the percentage of seed germination so that in the first experiment, the highest percentage of germination (97.33) was observed under stress-free conditions with the application of 0.5 mM salicylic acid for 48 hours, which was 12.2% higher than the control treatment. 0.5 Mm of SA treatment with 24 hours of priming showed the highest percentage of germination under drought stresses of -0.1 and -0.5 Mpa. However, under drought stress conditions of -1 Mpa, 0.5 mM SA+48 hours treatment was superior compared to other treatments of salicylic acid and time. In the second experiment, the highest percentage of germination (98.3) was in the concentration of 10 μM jasmonic acid during 24 hours of priming under stress-free conditions, which showed an increase of 40.4% compared to the control treatment.

The results of the present study showed the importance of salicylic acid and jasmonic acid during seed germination stage under drought stress. Seed priming with salicylic acid alleviated the damages caused by drought stress on germination and growth. The process of adaptation to stress started by jasmonic acid can be attributed to pretreatment with jasmonic acid before applying drought stress.

The effect of priming Catharanthus roseus seeds with salicylic acid and jasmonic acid phytohormones on the germination characteristics of seeds under drought stress was investigated.
Priming Catharanthus roseus seeds with salicylic acid improved the germination percentage and characteristics of seeds under drought stress.

This experiment was conducted to evaluate the impact of different levels of salt stress (non-saline, 4, 7 and 10 dSm-1) and foliar application of hormones (foliar spray of water, 1 mM salicylic acid, 0.5 mM jasmonic acid and 1 mM salicylic acid + 0.5 mM jasmonic acid) on changes in soybean (Glycine max cv. M7) seed quality. Salinity increased the sodium content of soybean seeds, but reduced the calcium and potassium contents, seed weight, germination rate and seedling weight. However, salt treatment on plants did not change the germination percentage of seeds. Foliar application of salicylic acid decreased sodium content of soybean seeds, and increased calcium and potassium contents of seeds, seed weight, germination rate and seedling weight of soybean. Foliar application of jasmonic acid reduced sodium, potassium and calcium contents of seeds, seed weight and seedling weight, but did not affect germination percentage and rate. Plants treated with 1 mM salicylic acid + 0.5 mM jasmonic acid produced the largest seeds, however its effect on seed germination rate and seedling weight was similar to salicylic acid treatment. Based on the results, foliar application of salicylic acid individually or in combination with jasmonic acid could be a practical way improve seed quality of soybean by decreasing sodium content and increasing potassium and calcium content of seeds under salt stress.

Catharanthus roseus is regarded as a medicinal ornamental plant. This plant has anti-cancer, anti-hypertensive, anti-diabetes, and antimicrobial properties. Catharanthus has a fairly long vegetative period due to its slow initial growth. The long growth period of the plant is considered one of the limitations in its cultivation on a larger scale. By using plant growth regulators such as salicylic acid (SA) in the imbibition phase and pre-treatment, an increase in seed activity and the seedling growth of many crops is observable. Also, jasmonic acid (JA) plant growth regulators play an important role in seed germination and plant growth. Regarding the long growth period of this plant, the small size of the seed, and poor establishment in the field with semi-heavy and heavy textured soils, the present study aimed to evaluate the effect of seed priming with SA and JA in different concentrations and periods on improving Catharanthus roseus seed germination indices.

The studies were conducted as a factorial experiment based on a completely randomized design with three replications at the Laboratory of Seed Science and Technology of Shahed University, Tehran, in 2017. Treatments included five different concentrations of SA (0, 0.01, 0.1, 0.5, and 1 mM), concentrations of JA (0, 1, 10, and 100 µM) and five periods of time (0, 6, 12, 24, and 48 hours). At the end of the experiment (10 days) traits such as germination percentage, germination rate, mean germination time, mean daily germination, germination value, seed length vigor index, seed weight vigor index, seedling dry weight, shoot dry weight, radicle dry weight, radicle length, shoot length, and seedling length were measured.

The results indicated that the effect SA, JA, and time were significant on germination percentage, germination speed, mean germination time, mean daily germination, germination value, seedling length, seedling length vigor index, seedling weight vigor index, and radicle dry weight. The best times for pre-treatment with SA were 24 and 48 hours. Among the applied concentrations of SA, 0.5 and 1 mM concentrations showed the best results. Also, the best time and concentration for pre-treatment with JA were 12 and 24 hours and 10 µM.

The results of this study showed that using SA and JA for seed priming improved seed germination components. In addition to the pre-treatment concentrations of SA and JA, the duration of seed contact with growth regulators is important. It was observed that there was a significant difference among the different priming times, therefore, it can be stated that seed pre-treatment time is one of the important factors of seed priming, and the determination of proper priming time prevented the negative effect of pretreatment on germination and seedling growth in primed seeds.

Legumes are the most important source of plant protein and Mung bean has a high nutritional value for humans, as it produces seeds containing high protein percentage. The major problem of salinity in seed germination of higher plants is due to excessive amounts of sodium chloride, osmotic pressure, disruption of nutrient uptake and transport, and direct effects of ionic toxicity on the membrane and enzymatic systems that in turn reduce germination. External use of methyl jasmonate can modulate the effects of various stresses, such as salinity and drought, by increasing the antioxidant activity of the seed. Therefore, the purpose of this research was to evaluate the effect of methyl jasmonate and salinity stress on germination and enzymatic properties of Mung bean.

This study was conducted as factorial based on a completely randomized design with three replications during 2015-16 at the laboratory of Department of Agronomy, Tarbiat Modares University. The experimental treatments included four methyl jasmonate solution (0, 50, 100 and 150 mM) and four salinity stress levels (0, 2, 4 and 6 dS/m salinity from NaCl). Petri dishes were placed in a germinator at 25 ° C and in full darkness for 14 days. In this experiment, germination rate and percentage, time to reach 50% germination, alpha and beta amylase, catalase and peroxidase were measured.

The results of the experiment showed that the lowest rate of slope and final germination percentage were obtained in 50 and 100 mM solutions of methyl jasmonate. In terms of T50, an increase of 4.7 days was observed per one dS/m increase in salinity stress and the lowest T50 was estimated at a methyl jasmonate solution concentration of 78.68 mM. In terms of the activity of germination enzymes, reduction of 0.031 μmol/ml/min per 1 dS.m increase in salinity stress and the highest amount of α-amylase were estimated 72.6 μmol/ml/min at a methyl jasmonate solution concentration of 73.33 mM. Also, the lowest activity of β-amylase enzyme was 0.79 μmol/ml/min at a concentration of 5.6 dS/m salinity stress and the highest activity of β-amylase enzyme was estimated to be 1.7 μmol/ml/min at a methyl jasmonate solution concentration of 86.67 mM. The highest activity of catalase (25.7 ∆A/mg protein/min) was observed at 14.72 dS/m salinity stress and the lowest activity of catalase enzyme (8.9 ∆A/mg protein/min) was estimated at 5.88 mM methyl jasmonate solution. The highest activity of peroxidase enzyme (22.06 ∆A/mg protein/min) was at 24.3 dS/m salinity stress and the lowest activity of the enzyme peroxidase (2.5 ∆A/ mg protein/min) was determined at a methyl jasmonate solution concentration of 266.66 mM.

In general, pre-treatment of methyl jasmonate can reduce the germination time, increase the rate of germination and reduce the oxidative stress in salt stress conditions by improving the activity of germination enzymes, increasing the activity of enzymes, increasing the activity of hydrolyzing enzymes and increasing the easy availability of seedlings to nutrients during germination. Highlights: 1- Germination rate and percentage and morpho-physiological changes of Mung bean seed as affected by methyl jasmonate were investigated. 2- The role of alpha and beta amylase germination enzymes in accelerating the production of Mungbean seedlings under saline conditions were estimated. 3- Methyl jasmonate- induced catalase and peroxidase enzymes activity in resistance to salinity stress were estimated.

An experiment was conducted to investigate the effects of jasmonic and humic acids on some seed germination characteristics of Roselle under the salt stress condition in a factorial experiment, adopting a completely randomized design with three replications. Treatments included four different levels of salinity stresses: 0, 70, 140 and 210 mM; four levels of Jasmonic Acid: 0, 50, 150 and 200 mM and three levels of humic acid: 0, 40 and 80 mM. The results showed that the effect of salinity on all the traits studied was significant except the ratio of the length of root and shoot. With an increase in salinity stress condition from 70 to 210 mM, there were 39% decrease in germination percentage, 55% in germination rate, 45% in fresh and dry weight, 30% in root length, 42% in shoot length, 37% in seedling length, 67% in longitudinal index and 61% in the weighted power, as compared with the control. However, the longitudinal power index increased. In addition, the use of jasmonic acid and humic acids had a significant effect on the traits studied. The interaction of the salt and hormones had a significant impact on plant fresh and dry weight, the length of the root, germination percentage, power weight index and average time needed for 50 percent germination. Given that the highest rate of root length and plant fresh and dry weight belonged to the interaction of humic and jasmonic acid in the absence of salinity, that in the presence of humic acid (with 80 mM concentration), Rosselle can bear salinity up to 140 mM and maintain stamina root length and that the germination rate of Rosselle increases by adding jasmonic acid up to 200 mM, one can conclude that the interaction of jasmonic and humic acids not only improves germination rate, but it also contributes to root length because, with an increase in root length, Rosselle can bear water stress conditions.
Highlights: 1. Jasmonic acid and humic acid increase the Rosselle germination in salinity condition.
2.Jasmonic acid and humic acid increase Rosselle the root length in salinity condition.

Lavender (Lavendula officinalis L.) is the most important medicinal plant, belongs to lamiaceae family in which had a role in ancient medicine. Growth and yield of plants are being limited by the abiotic environmental stresses including salinity in many places throughout the world, which have caused a widespread harm to the plants, also it is considered as an important functional limitations for yield around the world. This study was done to evaluate effect of salicylic acid and jasmonic acid on some growing traits and sodium and potassium content of the root and shoot in Lavender in salinity stress conditions. Also evaluating the foliar application of salicylic acid and jasmonic effect to reduce the harmful effects of salinity stress and reach to the effective introduction of new inputs was examined.
This experiment was done at Azad Islamic University, Yadegar-e-Imam Khomeini (RAH) Shahre-Rey branch and greenhouse located in the Region 4 in Jun 2015. The experiment was done as factorial based on completely randomized blocks deisign with four replications. The experimental factors were included salt stress (NaCl) in four levels (0, 25, 50, 75 mM), Salicylic acid in two levels (0 and 0.7 mM), and Jasmunic acid in two levels (0 and 100 µM).
The average comparison simple effects of salinity showed that this factor significantly reduced the morphological traits of root and shoot dry weight, root and shoot length, branches number, Leaves surface, also maide decreased in root and shoot potassium, and increased the root and shoot sodium. The results indicated that only triple interaction effect of experimental factors were meaningful on dry weight of root, At this situation the optimum root dry weight equivalent 2.21 gr, was gained in the factors of salinity stress and Salicylic acid and Jasmonic acid foliar application. According to findings, the highest root potassium contents with 1.20 and 1.96 element weight percent per dry matter conducted in non-salt stress treatment and 0.7 mM Salycilic acid or 100 µm Jasmonic acid application conditions alternatively.
Based on the results, it seems that potasium adsobtion in root and shoot has a role in enhancing salt resistance as an effective mechanism. However in most of experimental traits, the role of Salycilic acid in enhancing growth traits potasium content of root and shoot and at the other side sodium decrease in root and shoot of Lavender was more effective than Jasmonic acid.