جستجوی مقالات مرتبط با کلیدواژه "spermidine" در نشریات گروه "زیست شناسی"

This experiment aims to investigate the effect of foliar spraying of polyamines on growth traits, root characteristics, physiological traits and seed yield and yield components of the Camelina plant at different levels of salinity stress, a pot factorial experiment based on a completely randomized design was done in 2021 at Payam Noor University. The first factor was the salinity stress with Urmia lake water at three levels (0, 15 and 30 dS/m) and the second factor was foliar spraying polyamines at four levels (spermine, spermidine, putrescine and control (spraying with water)). The results showed that the salinity stress of 30 and 15 ds/m in comparison with the control decreased root diameter (16 and 4 percent), root dry weight (39 and 17 percent), root volume (43 and 31 percent), relative leaf water content (60 and 23 percent), chlorophyll a concentration (57 and 13 percent), chlorophyll b concentration (61 and 21 percent), the number of capsules per plant (52 and 25 percent), the weight of 100 seeds (30 and 5 percent), seed yield (52 and 10 percent), and biological yield (38 and 10 percent), respectively. But salinity stress at 30 and 15 ds/m increased leaf temperature (12 and 6%), carotenoid concentration (56 and 46%), and leaf proline concentration (44 and 40%), respectively. Foliar spraying with spermine, spermidine and putrescine in comparison with no foliar spraying, enhanced the number of capsules per plant (26, 23 and 24%), weight of 100 seeds (28, 17 and 12%) and seed yield (38, 8 and 21 percent), respectively. On the other hand, it reduced the effects of salinity stress. Therefore, it seems that the Camelina plant can tolerate salinity up to 15 dS/m. Foliar spraying with polyamines can be a good approach to improving the tolerance, growth and yield of Camelina under salinity stress conditions.

Drought stress is the most common abiotic stress that has the most negative effect on plant growth and production Polyamines are plant growth regulators that increase plant resistance to environmental stresses, including drought stress. The aim of this study was to investigate the effect of foliar application of spermidine on reducing the effects of drought stress on marigold (Calendula officinalis L.). For this purpose, foliar application of spermidine (0, 50, and 100 mg/l) was considered at different levels of drought stress (control, 25, 50, and 75% of field capacity) in a factorial experiment based on a completely randomized design with 3 replications in 2018 in a greenhouse located in northern Iran. The foliar application was applied at three stages with intervals of about 20 days including six visible leaves, complete tillering, and emergence of the first bud. Results showed that drought stress and foliar application of spermidine had a significant effect on the evaluated traits. The highest fresh and dry weight of shoots, number of flowers, and total chlorophyll contents were observed in the treatment with 75% of field capacity and spermidine 50 mg/l and the highest fresh and dry weight of roots and flowers on the plant were recorded in the treatment with 100% of field capacity and spermidine 100 mg/l. Also, the highest root length, plant height, total antioxidant activity (DPPH), rutin and quercetin were observed in the treatment with 75% of field capacity and spermidine 100 mg/l and the highest proline and polyphenol oxidase activity was observed in the treatment with 25% of field capacity. Therefore, according to the results of this study, foliar application of spermidine 100 mg/l with an irrigation level of 75% of field capacity is recommended for marigold.

Heavy metals stress (cadmium stress) is one of the most important factors which lead to reduction of plant growth and productivity of agricultural products. One of the plant responses to heavy metal stresses is changes in polyamines contents in plants. Regarding the economic importance of maize, the effects of cadmium stress on seed germination, plant growth parameters and polyamines contents (putrescin, spermidine and spermine) were investigated in 3 days-old seedlings and the roots after 6, 12, 15 and 20 days. Polyamines analysis was performed by HPTLC. The results indicated that cadmium stress in maize is the cause of delay in seed germination and decreased plant growth parameters. Cadmium stress increased the total polyamine content as a result of 35% increase of the putrescine in 3 days-old seedlings. In general, a significant increase of putrescine was observed in the roots of the 6 days-old- and 15 days-old plants under cadmium stress. While the highest amount of spermine and spermidine was in the root of the 12 days-old plants under cadmium stress. Roots of the 15-days-old plant showed the highest content and translocation factor of cadmium. These results suggest that the changes in the amount of polyamines in maize plant under cadmium stress depend on the cadmium absorption by the plant root and the type of polyamines.

To study the Evaluation of foliar application of spermidine, citric acid and proline (zero, 50 and 100 mg / l) on growth and flowering in pot marigold (Calendula officinalis L.) under drought stress (no stress (control), 25, 50 and 75% Crop capacity) was performed as a factorial experiment in a completely randomized design with three replications in a greenhouse located in northern Iran. The results of this study showed that increasing drought stress levels caused a significant decrease in fresh and dry weight of shoots and roots, plant height, root length, number of flowers, and longevity of the flower on the plant. Treatment of plants with different levels of spermidine, citric acid and proline significantly increased the evaluated traits, so that the highest fresh and dry weight of shoots and longevity of the flower on the plant was in proline 100 mg/l and control irrigation level and the highest fresh and dry weight of root and root length was in proline 100 mg/l and 75% of field capacity. Also, the highest plant height was in spermidine 100 mg/l and control irrigation level and the highest number of flowers were obtained in proline 50 mg/l and control irrigation level. In general, the results of this experiment showed that foliar application of 50 and 100 mg/l spermidine, citric acid and proline can partially compensate for the adverse effects of dehydration, but to enhance the growth and physiological characteristics of pot marigold, foliar application with proline 100 mg/l with 75% of field capacity is recommended.

Today, the biggest challenge that threatens domestic and foreign citrus markets is the rising cost of production and the low unit yield. Therefore, any agronomic techniques that reduce pre-harvest losses and increase production can increase production efficiency and productivity of soil and water resources. This study was conducted to investigate the effect of foliar application of different polyamines (putrescine, spermine, spermidine) on the yield properties of sweet lemon fruit in a completely randomized design with six treatments including spermine (0.25 and 0.5 mM), putrescine (0.1 And 0.25 mM), spermidine (1 and 1.5 mM) and control. The results showed that the best polyamine for use in sweet lemons is putrescine 0.1 mM. The results also showed a significant and positive effect of this treatment on preharvest fruit loss. The results of the study recommend sweet lemon growers use polyamines to enhance yield.

In order to effect of spermidine and polyethylene glycol pretreatment on germination and some physiological and morphological activity durum wheat under salinity stress a experiment with 20 treatments, three replications was conducted in 60 experimental units. Treatments included five levels of spermidine (zero, 02/0, 05/0, 1/0 and 15/0 mM) and four levels of polyethylene glycol (zero,- 2,- 4 and -5 bar). The results showed that the use of spermidine increased the relative weight contact(RWC) of durum wheat leaf, leaf area ratio, chlorophyll a, chlorophyll b, carotenoids and phenolic compounds .The most of increase in the relative weight been showed in treatments of 02/0 and 05/0 mm of spermidine and the lowest was related to the control of durum wheat at a concentration of 1.0 mM. Maximum leaf area ratio(LAR) seen inconcentration of 0/1mM spermidine, which was statistically significant and the lowest was in 0/15 mM spermidine.The most of effect spermidine showed on the relative growth rate(RGR) by application of 0/15mM and in chlorophylla aregarding .0/5 mM and chlorophull b in the treatment of 0/15 mM, carotenoids in control and total phenolics had in 0/05Mm polyethylene glycole increased chlorophyll a and total phenol but decreased germination and chlorophyll b. Reaction of Polyethylene glycole and spermidine increased percentage of germination, chlorophyll a, chlorophyll b, carotenoids, total phenol and its effect was statistically significant

Production of heavy metals by human activity is caused soil contaminations. The polyamines are used to reduction of heavy metal effects. In this study, the effects of lead and spermidine on Salvia officinalis L. were tested. A factorial experiment was conducted in a completely randomized design with three replications. Lead nitrate at concentrations of 0, 125, 250 and 1000 micro molar and spermidine at a concentration of 0 and 1 mM was used. Plant height, dry and fresh weight, catalase and polyphenol oxidase activity, antioxidant capacity and total phenols contents was measured. The utilization of lead nitrate increased the length, dry weight, catalase activity except at a concentration of 125 micro molar and poly phenol oxidase activity. Antioxidant capacity did not change except in a concentration of 1000 micro molar. Total phenols content increased in 250 micro molar concentrations and the other treatments were not much difference. Use of spermidine and lead increased the length in a concentration of 500 and 1000 micro-molar. Dry weights increased in all treatments. The maximum catalase activity was observed in a concentration of 500 micro-molar lead and spermidine. The minimum activity was seen in a concentration of 250 micro-molar with spermidine. Poly phenol oxidase activity increased just in a concentration of 250 micro-molar lead with spermidine. The total phenols and antioxidant capacity decreased under 500 micro-molar of lead and spermidine. Addition of spermidine under lead stress increased plant length and weight and in low concentrations of lead total phenols increased

Rose with the scientific name Rosa hybrida is one of the plant of Rosaceae family. Polyamines of aliphatic amine groups are as plant growth regulators in a wide range of developmental processes, including cell division, embryogenesis, morphogenesis, flowering, fruit ripening, root development, delay aging, stable membranes, collection of active radicals and stress tolerance different participate, Putrescine (put), spermine (spm) and spermidine (spd) is the most common polyamines. The study to evaluate the effect of putrescine, spermidine spermine and on some physiological characteristics and natural biological and biochemical Morpho flowers rose black baccarat was done. This study randomized with 7 treatments including spm, spd and put in concentration 50 and 100 pmm and distilled water as a control with three replicates each of three experimental unit is composed of a total of 63 pots of roses and traits assessed include fresh weight, dry weight, relative water content, number of flowers, leaf surface, superoxide dismutase enzyms activity and flower longevity. Analysis of variance results showed that 100 ppm spermine greatest effects on improving the morphological, physiological and enzymes traits and the results were significant at 1%.

The effects of pulse Putrescine, spermine and spermidine, on cut Rose was studied. Putrescine, spermine and spermidine in the two levels 100 and 200 mg 1- were tested. This study was conducted in a factorial experiment with complete randomized design on 120 Rose cut flowers in horticulture laboratory of agriculture faculty of Islamic Azad University, Science and Research Branch branch. The recorded traits included vase life, protein content, anthocyanin and water absorption. The results showed that 200 mg 1- spermine treatments increased cut flower vase life, protein content, anthocyanin and water absorption.

Vase life of cut flower plays important economic values in flower production industries. The effects of putrescine, spermine and spermidine on cut Rose was studied. putrescine, spermine and spermidine (100 and 200 mg l-) and their combinations with sucrose (3%) and silver nanoparticles (4 mg 1-) were tested as preservative mixture. This study was conducted in a factorial experiment with complete randomized design. The recorded traits included vase life, SOD content, and solution uptake. The results shown that level of 200 mg -1 spermine to increase of SOD content, vase life and solution uptake.

Salinity is one of the most important factors that limit plant growth and production in the whole word. Compounds, which are able to reduce the damaging effects of various stresses such as salinity, should be of great important. In this investigation, the effects of spermidine on salt tolerance of Matricaria recutitaa were investigated. The results showed that, salt stress in chamomile plants caused the reduction of growth and increased the amounts of hydrogen peroxide, malondialdehyde and the activity of ascorbate peroxidase and guaiacol peroxidase. Pre-treatment of chamomile plants with spermimdine had no significant effect on shoot growth and the activity of ascorbate peroxidase enzyme, while reduced the content of hydrogen peroxide and malondialdehyde obviously, and increased the root growth and activity of guaiacol peroxidase significantly. Application of spermidine with methylene blue reduced the effect of spermidine on the increment of root growth, decrease of hydrogen peroxide, malondialdehyd and ascorbate peroxidase activity while had no significant effect on shoot growth and guaiacol peroxidase activity. Therefore, it seems that Spd effects on these physiological parameters are through nitric oxide and guanylate cyclase pathway however, more studies required for detail investigations.