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Articles by M. Kazemi
Total Records ( 24 ) for M. Kazemi
  M. Kazemi , S. Zamani and M. Aran
  In this study, effects of different concentrations of glutamin, malic acid, Salicylic acid and their interaction on extending the vase life, total chlorophyll content, ACC-Oxidase activity, anthocyanin leakage, membrane stability and malondialdehyde content of Cut Flowers of 'Prato' Lily was investigated. The vase were placed in chambers at 25°C, relative humidity about 70% and 14 h photoperiod that was maintained using fluorescent lamps (light intensity of 15 μ mol m-2 sec-1) at the top of the corolla. The results showed that glutamin, malic acid and Salicylic acid treatments increased the vase life and decrease the percentage of wilting compared to the control. The vase solution containing 3 mM glutamin and 4 mM malic acid with 2 mM Salicylic acid significantly increased vase life compared to the control, in addition, the malondialdehyde accumulation and ACC-Oxidase activity reduced in the same solution while membrane stability was improved. Results suggest that glutamin and malic acid along with salicylic acid increases vase life by affecting many of the age-related changes associated with Lily petal senescence.
  M. Kazemi , S. Zamani and M. Aran
  The experiment was carried out to investigate the effect of different concentrations of Salicylic acid, Malic acid, Citric acid and Sucrose on keeping quality and vase life of gebrera cut flowers. In this study three levels of malic acid (0, 100 and 150 mg L-1 ), two levels of sucrose (0 and 3% w/v), three levels of salicylic acid (0 , 1.5 and 3 mM) and two levels of citric acid (0 and 150 mg L-1) were applied in a factorial arrangement, carried out in a complete randomized design on 144 gebrera cut flowers. The vase were placed in chambers at 19°C, relative humidity about 70% and 14 h photoperiod that was maintained using fluorescent lamps (light intensity of 15 μmol m-2 sec-1) at the top of the corolla. The recorded traits included Vase life, total chlorophyll content (SPAD reading), anthocyanin leakage, MDA content, ACC-Oxidase activity and water absorption. The results showed that malic acid, salicylic acid and sucrose treatments increased cut-flower water absorption, fresh weight and vase life, while decreasing MDA content, ACC-oxidase activity and membrane permeability together with total delaye of senescence and peroxidation of lipids. Maximum flower vase life was recorded in treatment with 150 mg L-1 malic acid+1.5 mM salicylic acid+sucrose 3%. A direct relationship between vase life and increasing of fresh weight and water uptake was observed as well.
  M. Kazemi , E. Hadavi and J. Hekmati
  The effects of Salicylic acid and sucrose on the ACC-oxidase (ACO) activity, bacteria populations in vase flower preservative solution, anthocyanin leakage, Membrane stability and Malondialdehyde (MDA) content of cut flowers of carnations (Dianthus caryophyllus L. cv.White) were investigated. In this study, cut flowers of carnation were treated with Factor Salicylic acid (0,1.5, 3 mM) and sucrose (0, 3%). The vase were placed in chambers at 25°C, relative humidity about 70% and 14 h photoperiod that was maintained using fluorescent lamps (light intensity of 15 μmol m-2 sec-1) at the top of the corolla. The experimental results showed that SA treatment cause decrease malondialdehyde content and ACC-oxidase activity while the membrane stability was improved. Results also, showed that the best treatment involved 1.5 mM SA+ sucrose 3%. The vase solution containing 1.5 mM salicylic acid + sucrose 3% significantly decrease malondialdehyde content, ACC-oxidase activity and bacteria populations in vase flower preservative solution while increase the vase life and Membrane stability of carnation cut flower compared to the control. Results suggest that salicylic acid and sucrose increases Membrane stability by decrease malondialdehyde content, ACC-oxidase activity and bacteria populations in vase flower preservative solution of the carnation cut flowers. This study shows that Salicylic acid and sucrose treatment did show significant effect on quality parameters and carnation flower longevity. Salicylic acid and sucrose proved more effective in delaying petal senescence and/or flower wilting. However, our result showed that Salicylic acid and sucrose treatments maintained the vase life of flowers for a longer period.
  M. Kazemi , M. Aran and S. Zamani
  Apple texture can deteriorate during cold storage, resulting in softness and mealiness. The purpose of this work was to estimate shelf-life and to study the behavior of ‘Jonagold’ apples kept at 5°C in a normal atmosphere. The experiment was started in season 2010-2011 and Fruit Weight Losses, Fruit Firmness, Total soluble solids, Titratable acidity, Peroxidase activity, ascorbic acid content (Vitamin C) and Superoxide dismutase activity were measured at 15, 30 and 60th days of postharvest life. In this research, fruits were immersed in salicylic acid solution (0, 1.5, 3 mM) for 5 min, stored at 5°C up to 60 days. The results showed that fruit weight loss significantly decreased in all SA concentrations in comparison to control. Also, the results showed that fruits treated in SA solution for 5minutes had higher firmness, TA, Peroxidase activity, Superoxide dismutase activity and lower TSS than fruits that treated in control. Furthermore, significant changes were observed in browning index and relative electrical conductivity during storage in all treatments. The results showed that SA application was influenced on vitamin C value in comparison to control. In general, this experiment showed that post-harvest SA treatment prevented fruit softening and decreased weight losses. This treatment can be easily used to improve of apple fruits during.
  M. Kazemi , M. Aran and S. Zamani
  Kiwifruit texture can deteriorate during cold storage, resulting in softness and mealiness. The purpose of this work was to estimate shelf-life and to study the behavior of ‘Actinidia deliciosa cv. Hayward’ kiwifruit kept at 1°C in a normal atmosphere. The effects of postharvest calcium chloride and salicylic acid applications on shelf-life and quality attributes of kiwifruits (Actinidia deliciosa cv. Hayward) after harvest or cold storage up to 60 days were determined. The experiment was started in season 2010-2011 and fruit weight losses, fruit firmness, total soluble solids (TSS), titratable acidity (TA), Peroxidase activity (POD) and ascorbic acid content (Vitamin C) were measured at 15, 30 and 60th days of postharvest life. The fruits were immersed in deionised water or at three calcium concentrations (0, 2 and 4% (W/V) and three salicylic acid concentrations (0, 2 and 4 mM). Results showed that fruit weight loss significantly decreased in combined treatment (calcium+salicylic acid) in comparison to control. Also, results showed that combined treatment (calcium+salicylic acid) increase fruit firmness and Peroxidase activity, while decreasing weight losses percentages and fruit decay percentage during cold storage at 1°C for 60 days (p≤0.05). Results showed that postharvest calcium chloride dips did not effect TA % in kiwifruit in during storage, while the fruits treated in SA solution for 5 min had higher TA and lower TSS than fruits that treated in control and Ca (p≤0.05). Furthermore, significant changes were observed in browning index and relative electrical conductivity during storage in all treatments (p≤0.05). The results showed that combined treatment (calcium+salicylic acid) application was influenced on Vitamin C value in comparison to control. In general, this experiment showed that post-harvest Salicylic acid (SA) and Ca treatments prevented fruit softening and decreased weight losses. This treatment can be easily used to improve of apple fruits during.
  M. Kazemi , M. Aran and S. Zamani
  Combinations of glutamine, succinic acid, Salicylic acid and citric acid were used as preservative mixture for cut Lisianthus and their effect on regulation of senescence was examined. In this study, the recorded traits included vase life, total chlorophyll content (SPAD reading), anthocyanin leakage, malondialdehyde content and ACC-oxidase activity. The vase were placed in chambers at 19°C, relative humidity about 70% and 14 h photoperiod that was maintained using fluorescent lamps (light intensity of 15 μmol m-2 sec-1) at the top of the corolla. The results showed that glutamine, succinic acid and Salicylic acid treatments increased the vase life and decrease the percentage of wilting compared to the control. The vase solution containing 3 mM glutamine and 4 mM succinic acid with 2 mM salicylic acid significantly increased vase life compared to the control, in addition, the malondialdehyde accumulation and ACC-Oxidase activity reduced in the same solution while membrane stability was improved. Results suggest that glutamine, succinic acid and Salicylic acid increases vase life by affecting many of the age-related changes associated with Lisianthus petal senescence.
  E. Shirzadeh and M. Kazemi
  Apple texture can deteriorate during cold storage, resulting in softness and mealiness. The purpose of this work was to estimate shelf-life and to study the behavior of ‘Jonagold’ apples kept at 0-2°C in a normal atmosphere. The experiment was started in season 2010-2011 and fruit weight losses, fruit firmness, Total Soluble Solid (TSS), pH, Titratable acidity, Total soluble solids/titratable acidity ratio, Thiault index, Perlim index, Ethylene production, Peroxidase and Catalase enzyme activities were measured at 20, 40, 60, 80, 100, 120 and 150 th days of postharvest life. The fruits were immersed in distilled water, three malic acid concentrations (0, 100 and 150 mg-1) or at three calcium concentrations (0, 0.35 and 0.7% w/v). Results showed that fruit weight loss significantly decreased in malic acid+calcium treatments in comparison to control. Also, results showed that malic acid+calcium treatments increase fruit firmness, Catalase activity (CAT), Titratable acidity (TA) and Perlim index while decreasing of pH, Total soluble solids/Titratable acidity ratio and Peroxidase activity (POD) during cold storage at 0-2°C for 5 month (p≤0.05). The results showed that malic acid+calcium treatments application was influenced on ethylene in comparison to control. In general, this experiment showed that post-harvest malic acid+calcium treatments prevented fruit softening and decreased weight losses.
  M. Kazemi and E. Shirzadeh
  In the present study, effect of exogenous application of salicylic acid (1.5 and 3 mM ) and malic acid (100 and 150 mg L-1) on components of essential oils of Rosmarinus officinalis was evaluated. All SA and MA treatments enhanced limonene, 1.8-cineole, α-pinene, camphene and camphor, while terpinen-4-ol, sabinene, verbenol, germacrene-D, bornyl acetate, myrcene, α-phelandrene, α-terpinolene and β-caryophyllene decreased. The study demonstrated that SA and MA can be change secondary metabolites in Rosmarinus officinalis.
  E. Shirzadeh and M. Kazemi
  Apple texture can deteriorate during cold storage, resulting in softness and mealiness. The experiment was started in season 2010-2011. In order to study the effectiveness of salicylic acid, calcium nitrate and essential oils treatments on postharvest quality and storage behavior of “Granny Smith” cultivar of apple. Fruit weight losses, fruit firmness, total soluble solids, pH; titratable acidity, total soluble solids/titratable acidity ratio and ethylene production were measured at 20, 80 and 140th days of postharvest life. Apples were dipped in concentrations, 2.5 mM salicylic acid (1%) of calcium nitrate and mentha essential oils solutions (150 ppm) 10 min and stored 0-2°C in a cold store for 20 weeks period. One percent Calcium nitrate and 2.5 mM salicylic acid did affect quality parameters of the fruit compared to control treatment (p = 0.05). Mentha essential oils solutions (150 ppm) did not affect quality parameters of the fruit compared to control treatment (p = 0.05). Results indicated the potential improvement of shelf life of apple by salicylic acid and calcium nitrate pre-treatment of the fruit, did further improve product quality.
  M. Kazemi , M. Gholami , M. Asadi , S. Aghdasi and M. Almasi
  Short postharvest vase life is one of the most important problems on the cut flowers. The study was conducted to investigate the effect of salicylic acid at different concentrations on carnation flower longevity, Aminocyclopropanecarboxylate oxidase (ACC-oxidase, ACO) activity and SOD activity vase solution of cut flowers carnation in laboratory condition. The treatments were distilled water, salicylic acid (0,1.5, 2.5, 3.5 mM) and glutamine (0, 2 and 4 mM). Results show that salicylic acid 2.5 mM followed by glutamine 4 mM is more effective than salicylic acid 1.5, 3.5 and 4.5 mM alone in improving the vase life of cut carnation flowers. The percent of wilting was minimized as a result of using this combined treatment. However, the percent of wilting increased with the increase in concentrations of salicylic acid. 2.5 mM salicylic acid+4 mM glutamine retarded the chlorophyll as well as carbohydrate degradation during the postharvest life. The results showed that salicylic acid and glutamine in preservative mixture increased the SOD activity of cut flowers and reduced ACC-xidase activity, free proline accumulation, number of bacterial on vase solution, as compared to control.
  H. Rostami , M. Kazemi and S. Shafiei
  Aromatic and medicinal plants are widespread throughout world. Essential oils obtained from different aromatic and medicinal plants parts have been shown antibacterial, antifungal, antiviral and antioxidant properties. The experiment was started in season 2010-2011. In this study we studied the chemical compositions of essential oils of Lavandula officinalis and Melissa officinalis and also tested antibacterial and anticandidal activities of essential oils. The essential oils of Lavandula officinalis and Melissa officinalis collected in Iran were obtained by hydrodistillation of the aerial parts and analysed by gas chromatography equipped with flame ionisation detector (GC-FID) and gas chromatography coupled to a mass spectrometry system (GC/MS) for their chemical composition. The main constituents of leave oils were α-pinene, Camphor, Menthol, 1,8-Cineole, β-pinene, linalool, thymol and carvacrol. This experiment indicated that the bacterial strains were sensitive to studied essential oils and also showed very effective bactericidal activity with the strongest inhibition zone. Among the eight of tested essential oil components, thymol, carvacrol and menthol showed the highest antibacterial activities than previous components and streptomycin while, β-Pinene and linalool showed lower antibacterial activity than streptomycin (p = 0.05). Essential oils of Lavandula officinalis and Melissa officinalis possess great antibacterial potential and could be used as natural preservatives and fungicides.
  M. Kazemi , M. Gholami and F. Hassanvand
  To understand the factors that induce floral senescence in gerbera, this study has investigated the effects of various chemical agents on flower senescence. The experiment was carried out to investigate the effect of different concentrations of silicon, acetylsalicylic acid and glutamine on keeping quality and vase life of gerbera cut flowers. The vase were placed in chambers at 19°C, relative humidity about 70% and 14th photoperiod that was maintained using fluorescent lamps (light intensity of 15 μmol m-2 sec-1) at the top of the corolla. The recorded traits included Vase life, total chlorophyll content (SPAD reading), anthocyanin leakage, malondialdehyde content, ACC-Oxidase activity and water absorption. The experiments show that: 3 mM silicon had no significant influence but 1 and 2 mM silicon caused an increase on vase life. The results showed that silicon, acetylsalicylic acid and glutamine treatments increased cut-flower water absorption, fresh weight and vase life, while decreasing MDA content, ACC-oxidase activity and membrane premeability together with total delay of senescence and peroxidation of lipids.
  H.R. Tavakoli Kakhki , M. Kazemi and H. Tavakoli
  In order to study the effect of seed size on seed vigor index of wheat, a factorial experiment based on a completely randomized design was arranged with four replications at the laboratory. The experiment had two factors. The first factor consisted of 13 wheat genotypes and the second factor included seed size at four levels (1.5, 2, 2.5 and 3 mm in diameter). According to the results, germination percentage, germination rate, root and shoot length, shoot/root length ratio were affected by seed size and genotypes (p<=0.01). Also it revealed, that there were significant correlation (R = 0.85; p<=0.01) between seedling growth rates and seed size treatments. Stepwise regression method was indicated that, seed size was the first (x1) and shoot length was the second (x2) independent variable that could be used to describe the trend of variation in seedling growth rate as dependent variable (Y) (R2 = 0.85). It was observed that by increasing seed size and shoot length, seedling growth rate was increased. As a result, it was concluded that seed size and shoot length are two factors that strongly affect seedling growth rate and could be used to evaluate and assess wheat genotypes and its improvement programs.
  M. Kazemi
  The experiment was carried out to investigate the effect of different concentrations of gibberellin 4+7 (Gi), 5-sulfosalicylic acid (5-SSA) and essential oils (EOS) of Thyme (Thymus vulgaris) (EOs) on keeping quality and vase life of Argyranthemum cut flowers. In this study six levels of gibberellin 4+7 (1, 2.5, 5, 7.5, 10 and 12.5 mg L-1 GA4+7), three levels 5-sulfosalicylic acid (1, 1.5 and 2.5 mM) and three levels of essential oils of Thyme (50, 100 and 150 mg L-1) were applied in a factorial arrangement, carried out in a complete randomized design on 216 Argyranthemum cut flowers. The recorded traits included Vase life, total chlorophyll content (SPAD reading), anthocyanin leakage, Malondialdehyde (MDA) content and ACC-Oxidase (ACO) activity. Results show that solution containing gibberellin 4+7 and 5-sulfosalicylic acid, could increase flower longevity in compared to control. Vase life in solution containing essential oils of Thyme did have significantly difference than control. Results showed that the microbal population of vase solution in cut flowers treated with essential oils and 5-sulfosalicylic acid were lower than other treatments. The results showed that gibberellin 4+7 (Gi) and 5-sulfosalicylic acid (5-SSA) treatments descreasing MDA content, ACC-oxidase activity and membrane premeability together with total delaye of senescence and peroxidation of lipids. our results suggest the application of gibberellin 4+7 (Gi) and 5-sulfosalicylic acid (5-SSA) in preservative solutions for Argyranthemum flowers maintained the vase life of flowers for a longer period.
  M. Kazemi , M. GHolami and F. Bahmanipour
  To understand the factors that induce floral senescence in carnation, we have investigated the effects of various chemical agents on flower senescence. The study was conducted to investigate the effect of silicon and acetylsalicylic acid at different concentrations on carnation flower longevity, ACC-oxidase activity and bacterial population vase solution of cut flowers carnation in laboratory condition. The treatments were distilled water, silicon (0, 1.5, 2.5, 3.5 mM) and acetylsalicylic acid (0, 1.5, 3 mM). Results show that 2.5 mM silicon followed by 3 mM acetylsalicylic acid is more effective than 1.5 and 3 mM silicon alone in improving the vase life of cut carnation flowers. The percent of wilting was minimized as a result of using this combined treatment. However, the percent of wilting increased with the increase in concentrations of silicon and acetylsalicylic acid. Silicon at level 2.5 mM retarded the chlorophyll as well as carbohydrate degradation during the postharvest life. The results showed that silicon and acetylsalicylic acid in preservative mixture reduced ACC-oxidase activity number of bacterial on vase solution significantly of cut flower in compared to control.
  M. Kazemi , A.M. Tahmasbi , R. Valizadeh , A.A. Naserian and M.M. Moheghi
  In vitro gas production and in situ techniques were used to evaluate nutritional value of some alternative weed forages e.g., Sorghum halepense, Salsola kali, Convolvulus arvensis and Portulaca oleracea. Cumulative gas production was recorded at 2, 4, 8, 12, 24, 48, 72, 96 and 120 h of incubation also, in situ disappear of dry matter for these weed forage was measured at 0, 2, 4, 8, 16, 24, 48, 72 and 96 h of incubation and gas production constants (b and c) were described using the equation y = b (1-e-ct). The most cumulative gas production was for Sorghum halepense in time of 120 h incubation (116.67 mL/300 mg of sample incubated) and Portulaca oleracea was the lowest cumulative gas production for 120 h incubation (66.35 mL/300 mg of sample incubated). The NDF, OM, Pr and DM were different among weed forages used in this study. The equation of y = a+b (1-e-ct) was applied for degradability of DM. The constant (readily soluble fraction, 53.53%) of Convolvulus arvensis was higher but, the constant of Salsola kali was lowest (45.82%). The b constant (insoluble fraction but degradable in rumen) for Sorghum halepense (44.48%) was significantly higher than other treatments and the c constant (rate of degradation of b per hour) was significantly higher for Portulaca oleracea (0.089%). According to results from gas production and in situ techniques, it seems that the Sorghum halepense has a higher nutritive value than other treatments, but more experiments were required for accurate determination of nutritional values of these forages.
  M. Kazemi , E. Hadavi and J. Hekmati
  Short postharvest vase life is one of the most important problems on the cut flowers. Combinations of malic acid, salicylic acid, citric acid and sucrose were used as preservative mixture for cut carnations and their effect on regulation of senescence was examined. The study was conducted in a factorial arrangement, carried out in a complete randomized design. The factors were malic acid (0,100 and 150 mg L-1), salicylic acid (0, 1.5 and 3 mM), citric acid (0 and 150 mg L-1) and sucrose (0 and 3% w/v). The effects of treatments and their interaction on the total chlorophyll content, ACC-oxidase activity, anthocyanin leakage, membrane stability and malondialdehyde content of cut flowers of carnations (Dianthus caryophyllus L. cv. White) were investigated. 150 mg L-1 MA and 1.5 mM SA both caused significant decrease in anthocyanin leakage, ACO activity and MDA content compared to other levels (p≤0.05). Flower stems that were kept in water containing either 150 mg L-1 MA or 1.5 mM SA or their combinations; all had significantly increased vase life relative to the control treatment. MA application increased water uptake and decreased microbial growth as well.
  M. Kazemi , H. Rostami and S. Shafiei
  The objective of the research was to determine the chemical compositions and antibacterial and antifungal activity of essential oils from 4 medicinal plants consist of Mentha piperita, Mentha spicata, Anethum graveolens and Foeniculum vulgare. Antibacterial and antifungal activity of these oils and their components were assayed against a variety of human pathogenic bacteria. Main components in Mentha piperita oil were menthol, limonene, 1,8-cineole, sabinene, menthyl acetate and menthone, in Mentha spicata oil carvone, menthol, limonene and menthone, in Anethum graveolens leaves oil α-phellandrene, Dill ether and β-phellandrene and in Foeniculum vulgare oil terpin-4-ol, t-anethole, fenchone and estragole. Present results showed that oils extracted from leaves of Anethum graveolens and Foeniculum vulgare plants did not show antibacterial or antifungal activities. Mentha piperita showed strong antibacterial and antifungal activities, however, lower than Mentha spicata. Carvone possessed the highest antibacterial and antifungal activity among the tested components. Essential oils of Mentha species possess great antibacterial and antifungal potential and could be used as natural preservatives and fungicides.
  F. Emami , H. Ali-Beig , S. Farahbakhsh , N. Mojabi , B. Rastegar-Moghadam , S. Arbabian , M. Kazemi , E. Tekieh , L. Golmanesh , M. Ranjbaran , C. Jalili , A. Noroozzadeh and H. Sahraei
  The anti-inflammatory and anti-nociceptive properties of Rosmarinus officinalis L. (ROL) extract and its major constituent, carnosol in male NMRI mice (W:25-30 g) have been evaluated in the present study. Formalin (2%, 20 μL) was injected into the plantar portion of the hind paw and resulting pain and inflammation was studied for 60 min. The plant extract, carnosol and other drugs were administered intraperitoneally or subcutaneously 30 min before formalin injection. In a separate experiment, the effects of the extract and carnosol on plasma corticosterone levels and activity of the enzymes cyclooxygenase type 1 and 2 (COX1 and COX2) were investigated. Injection of different doses of ROL and carnosol reduced pain in the phase 2 of the formalin test, which was not inhibited by naloxone and/or memantine. In addition, pretreatment of the animals with ROL and/or carnosol reduces the formalin-induced inflammation. Furthermore, the extract and carnosol did not affect plasma corticosterone levels compared with the control group. Interestingly, both the extract and carnosol inhibited COX1 and COX2 activity. It could be concluded that ROL extract and carnosol suppressed pain and inflammation induced by formalin injection, which may be due to inhibition of COX1 and COX2 enzymes activity.
  M. Kazemi , F. Bahmanipour and H. Lotfi
  The reduction of the ornamental value of cut flowers is mainly due to their short vase life. In this study we investigated the effect of cobalt, acetylsalicylic acid and Glutamine to extend the Vase-life of carnation (Dianthus caryophyllus L.) flowers. The treatments were distilled water, cobalt (0, 1.5, 3 mM), acetylsalicylic acid (0, 1.5, 3 mM) and glutamine (0, 1, 2 mM). Results show that solution containing 1.5 mM cobalt, 1.5 mM acetylsalicylic acid and 2 mM glutamine could increase flower longevity in compared to control. Vase life in solution containing 3 mM cobalt, 3 mM acetylsalicylic acid and their combination didn’t have significantly difference than control and glutamine. The results showed that cobalt, acetylsalicylic acid and glutamine treatments increased cut flower water absorption, fresh weight and vase life, while decreasing MDA content, ACC-oxidase activity and membrane premeability together with total delay of senescence and peroxidation of lipids. Present results suggest the application of cobalt, acetylsalicylic acid and glutamine in preservative solutions for carnation flowers maintained the vase life of flowers for a longer period.
  H.S. Hajizadeh and M. Kazemi
  Fresh cut fruits and vegetables raise food safety concerns including physiological and pathological limitations since they are often processed in a ripe stage which makes them more susceptible to quality deterioration. In this review, we investigated some advances for the maintenance of fresh-cut fruits and vegetables quality, including synthetic chemicals or plant natural antimicrobials and antioxidants, calcium salts, hot water and anoxia treatments, different type of coating and atmosphere conditions. In this review Phenylalanine Ammonia-lyase (PAL), Polyphenol Oxidase (PPO) and membrane permeability were discussed. Although, increasing in browning enzymes activities is documented in some cases but it seems that the main reason for browning inhibition of the fresh-cut products may be because of the maintenance of compartmentation between enzymes and their substrates, preventing enzymatic reaction.
  M. Kazemi
  This experiment revealed significant influence of cobalt (Co), silicon (Si), Acetylsalicylic Acid (ASA) and Sucrose (SUC) at different concentrations on the vase life of Argyranthemum cut flowers. In this study three levels of cobalt (0, 1 and 2 mM), three levels of silicon (0, 1.5 and 3 mM), three levels ASA (0, 1.5 and 3 mM) and two levels of SUC (0 and 2.5% w/v) were applied in a factorial arrangement, carried out in a complete randomized design on 324 Argyranthemum cut flowers. The recorded traits included Vase life, total chlorophyll content (SPAD reading), anthocyanin leakage, Malondialdehyde (MDA) content, ACC-oxidase (ACO) activity and water absorption. Results show that solution containing 2 mM cobalt, 1.5 mM silicon, 1.5 mM ASA and 2.5% w/v SUC could increase flower longevity in compared to control. Vase life in solution containing 3 mM silicon, 3 mM ASA and their combination didn’t have significantly difference than control. The results showed that silicon and ASA treatments increased cut-flower water absorption, fresh weight and vase life, while decreasing MDA content, ACC-oxidase activity and membrane premeability together with total delay of senescence and peroxidation of lipids our results suggest the application of silicon, ASA and cobalt in preservative solutions for Argyranthemum flowers maintained the vase life of flowers for a longer period.
  M. Kazemi , M. Gholami , M. Asadi and S. Aghdasi
  Short postharvest vase life is one of the most important problems on the cut flowers. The aim of this study was to evaluate the efficacy of silicon, nickel and acetylsalicylic acid and their interaction on extending the vase life, total chlorophyll content, ACC-oxidase (Aminocyclopropanecarboxylate oxidase, ACO) activity, anthocyanin leakage, membrane stability and malondialdehyde (MDA) content of Cut rose flowers. The treatments were distilled water, silicon (0, 1.5, 2.5 mM), acetylsalicylic acid (0, 1,1.5 mM) and nickel (0, 1, 2 mM). Vase life in solution containing 1.5 mM silicon and 1 mM acetylsalicylic acid didn’t have significant difference than control. The results showed that silicon, acetylsalicylic acid and nickel treatments increased cut flower water absorption, fresh weight and vase life, while decreasing malondialdehyde content, ACC-oxidase activity and membrane premeability together with total delay of senescence and peroxidation of lipids. Our results suggest the application of silicon, acetylsalicylic acid and nickel in preservative solutions for rose flowers maintained the vase life of flowers for a longer period.
  E. Shirzadeh and M. Kazemi
  Apple texture can deteriorate during cold storage, resulting in softness and mealiness. The experiment was started in season 2010-2011 and fruit weight losses, fruit firmness, total soluble solids, pH; titratable acidity, total soluble solids/titratable acidity ratio and ethylene production were measured at 20, 80 and 140 the days of postharvest life. The fruits were immersed in distilled water, calcium (1%) or at essential oils thyme (300 ppm) and lavender (500 ppm). Results showed that fruit weight loss significantly decreased in essential oils and calcium treatments in comparison to control. Also, results showed that essential oils and calcium treatments increase fruit firmness, TA while decreasing of ethylene production during cold storage at 0-2°C for 140 days (p = 0.05). The results showed that essential oils and calcium treatments application was influenced on ethylene in comparison to control. In general, this experiment showed that post-harvest essential oils and calcium treatments prevented fruit softening and decreased weight losses.
 
 
 
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