Showing 7 results for pakkish
Zahra Pakkish, Hamideh Mohammadi, Vahidreza Saffari,
Volume 5, Issue 15 (Vol. 5, No. 15, 2016 2016)
Abstract
Peach has high nutritional value that can be used fresh-edible or processed. This study, the effect of different levels of methyl jasmonate (0, 100 and 200mgL-1) and salicylic acid (0, 1 and 2mM), and their interactions on increasing qualitative and antioxidant characteristics at harvest time of “Elberta” peach to be considered. Thus, trees sprayed by treatments in two stages of green tip and pink tip of bud, in a split-factorial experiment in a randomized complete block design with 4 replications in field conditions. At harvest time, many of the qualitative and antioxidant characteristics of fruits such as total soluble solid, organic acids, vitamin C, carotenoids, anthocyanin, phenol content were studied. Generally, the results showed that spraying at both stage increased qualitative and antioxidant characteristics characteristics of fruits compared with control fruits and between treatments, methyl jasmonate 200mgL-1 and combined with salicylic acid 1mM had highest effect on improving quantitative characteristics of fruits and spraying at green tip was effectiveness compared with pink tip stage.
Hamid Bravardi, Zahra Pakkish, Soheila Mohammadrezakhani,
Volume 12, Issue 53 (vol. 12, no. 53 2023)
Abstract
Peach (Prunus persica) is one of the most important Iranian horticulture fruit. But the short of storage life and post-harvest losses are the Basie problems of fruit. This experiment was carried out to determine the effect of Folic acid on increasing shelf life of “Alberta” Peach in experimental university shahid Bahonar Kerman on design a randomized complete with three replication. Fruits of Peach treatment with Folic acid 0, 20 and 40 mMol for 5 Min and then stored at 1oC, 85-90% relative humidity for 21 days. Percentage of injured fruits, ion leakage, lipid peroxidation, hydrogen peroxide, organic acid, peroxidase and catalase activity and total soluble solids (TSS), were evaluated. The results showed that the effective compared to control and reduced percentage of injured fruits, ion leakage, lipid peroxidation, hydrogen peroxide. Generally, the results showed that the application of Folic acid 40 mMol were the most effective treatment.
Sheida Ghazanfari, Zahra Pakkish, Soheila Mohammadreazakhani,
Volume 12, Issue 58 (vol. 12, no. 58 2024)
Abstract
Chilling injury limits the storage life of nectarine fruit at low temperatures. Therefore, increasing the resistance to chilling injury will provide long-term maintenance of nectarine fruit at low temperatures. In this research, the effect of threonine at 250 and 500 µM on chilling injury and fruit quality of nectarine during storage at 1°C with 95% relative humidity for 30 days was studied. The measured traits included chilling injury, hydrogen peroxide, lipid peroxidation, TSS, organic acids, antioxidant capacity and antioxidant enzyme activity. The results showed that chilling injury decreased hydrogen peroxide production and lipid peroxidation in treated fruits with threonine compared to control during storage. The amount of organic acids, TSS, antioxidant capacity and activity of antioxidant enzymes in treated fruits increased until the end of storage. In general, the 500 µM threonine had the most significant effect on maintaining the quality of nectarine fruits during storage.
Neda Amiri, Najmeh Zeinalipour , Zahra Pakkish ,
Volume 13, Issue 61 (vol. 13, no. 61 2024)
Abstract
Coriander (Coriandrum sativum L.) is used as an aromatic and medicinal vegetable. Plant growth regulators improve plant performance under unfavorable conditions. In this study, the interaction effects of 24-epibrassinolide (0, 0.5 and 1 µM) and three levels of drought stress (-2, -3.5 and -4.5 bars) were investigated on growth parameters and coriander leaves essential oil. The highest main stem length, diameter, shoot fresh weight, and shoot dry weight were obtained by 0.5 µM of 24-epibrassinolide (EBR) under -3.5 bar. Both 0.5 and 1 µM concentrations of 24-epibrassinolide protected leaves of chlorophyll a and b against the effects of water deficit. The plants under -3.5 and -4.5 bar water deficits showed more leaf electrolyte leakage compared to the control (-2 bar). The highest percentage of all six measured essential oil components (linalool, (e)-2-decenal, 2-hexa-decenal, carvone, α-pinene and (E)-2-dodecenal) were obtained under moderate and severe levels of regulated water deficit. Foliar spray of EBR 0.5µM under severe drought stress with -4.5 bar of matric potential increased the main essential oil compositions such as linalool, (E)-2-decenal and (E)-2-hexa-decenal.
Mehdi Zia Ebrahimi, Zahra Pakkish, Soheila Mohammadrezakhani,
Volume 13, Issue 62 (vol. 13, no. 62 2024)
Abstract
This research was conducted in order to investigate the effect of hydrogen peroxide and brassinosteroid hormone on growth after harvesting Kino mandarin based on a completely randomized design with 5 treatments and 3 replications on Kino mandarin fruit harvested from Jiroft Commercial Gardens located in Jiroft Agriculture and Industry. Test treatments were by immersion method (for 5 minutes) and included oxygenated water with concentrations of 10 and 15 µM; brassinosteroid with concentrations of 0.5 and 1 mg/l; and distilled water treatment (control). Then the fruits were transferred to the cold room and kept at 4 degrees Celsius for 30 days and every 10 days the amount of damaged fruits, acidity and titratable acid, amount of soluble solids, lipid peroxidation, amount of peroxide hydrogen, peroxidase enzyme activity and catalase enzyme activity were investigated. The results showed that the effect of both treatments on improving the post-harvest life and quality characteristics of tangerine fruits was significant compared to the control. Thus, the use of brassinosteroid and hydrogen peroxide caused a decrease in the percentage of damaged fruits, lipid peroxidation, the amount of hydrogen peroxide, and increased activity of peroxidase enzyme and catalase enzyme activity during storage, and brassinosteroid hormone with a concentration of 1 mg/l and then hydrogen peroxide (15 µM) compared to other treatments had the greatest effect during storage on improving the life after harvesting of Kino mandarin fruit.
Taybeh Heydari, Zahra Pakkish, Soheila Mohammadrezakhani,
Volume 13, Issue 63 (vol. 13, no. 63 2024)
Abstract
One of the basic ways to increase the storage life of fruits is to use treatments that can increase their quality and marketability. In this research, compounds such as proline and GABA have been used due to their antioxidant properties in order to protect cell membranes, maintain quality and increase shelf life during the post-harvest period in sweet lemon fruits. The treatments included concentrations of GABA 100 and 200 mM/l, proline 250 and 500 mM/l, and distilled water (control). Then the desired fruits were treated in the desired solutions for 5 minutes by the immersion method. After the fruits were completely dried, they were placed in packs of 5 and transferred to the cold room, where they were kept at a temperature of 12 degrees Celsius for 4 months. Once every 30 days, a number of fruits were taken out of the cold room, and similar traits were observed. The percentage of fruit damage, organic acids, amount of dissolved solids, activity of peroxidase and catalase enzymes, hydrogen peroxide, lipid peroxidation and leakage were investigated. The results showed that the amount of damage, ion leakage, hydrogen peroxide and lipid peroxidation in the fruits treated with GABA 200 mM/l and proline 250 mM/l decreased compared to the control. The treatment of sweet lemon fruits with GABA 200 mM/l and proline 250 mM/l has led to an increase in the amount of soluble solids and organic acids, as well as the activity of peroxidase and catalase enzymes. Therefore, the use of GABA and proelin can be recommended to increase the storage life of fruit at the commercial level.
Zahra Pakkish, Soheila Mohammadrezakhani , Hadi Asghari,
Volume 13, Issue 64 (VOL. 13, NO. 64 2025)
Abstract
In this study, one product derived from sodium nitroprusside (SNP) was used as a nitric oxide (NO) donor and evaluated as a stimulant bud break agent of Ahmad-Aghaei pistachio. Trees were treated by SNP 0, 0.30, 0.60, 0.90 and 1.20 mM in two stages (4 and 8 weeks before normal budbreak (February 1 and January 1, respectively)) with a factorial experiment in a randomized complete block design with four replications. Results showed that SNP treatment hastened the bud break date and increased the yield. SNP decreased the misshapen nuts and empty and non-splitting shells compared with the control treatment. In both ON and OFF years, the effect of SNP was greatly dependent on both times of application and concentrations used. Results showed that exogenous application of this compound, especially during the second application, increased splitting shell nut, number of nuts per cluster, number of nuts per ounce, leaf area, shoot length, and shoot diameterin both ON and OFF years. No limitations were encountered. The results of this study might apply to pistachio and temperate fruit-growing regions with a mild winter. Because in mild winter, pistachio trees' chilling requirements are not resolved, and this substance helps with this deficiency.
