Showing 4 results for Proline.
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Volume 2, Issue 3 (6-2013)
Abstract
Yahya Emam1*, Hedayatallah Karimzadeh Soureshjani1, Saeed Moori and Kobra Maghsoudi1
1Department of agronomy and plant breeding, College of Agricultural, Shiraz University
(Received: 3 September 2012 Accepted: 4 May 2013)
Abstract:
In order to evaluate some biochemical responses of bread wheat (Shiraz cultivar) and durum wheat (Yavarous cultivar) to late season water stress and different auxin and cytokinin levels, a field experiment was carried out in research farm of the collage of Agriculture, Shiraz University during 2010-2011 growing season using a split split factorial as randomized complete block design with three replications. Irrigation regime (normal and cutting off water at anthesis), wheat cultivars (Shiraz and Yavarous) and factorial combination of auxin (0, 20 and 40 mg/L) and cytokinin (0, 50 and 70 Mm) levels were considered as main, sub and sub sub plats, respectively. The results showed that flag leaf proline and catalase content were increased linearly upon cutting off irrigation at anthesis while, proline and catalase content did not show any significant changes after anthesis under normal irrigation conditions. Moreover, proline content in Yavarous cultivar was found to be significantly greater than Shiraz cultivar. Among cytokinin concentrations, the highest catalase activity was obtained from control treatment. As cytokinin concentrations were increased, catalase activity was decreased under well watered conditions. Peroxidase activity was increased under irrigation cut off conditions, and was enhanced with time lapse from anthesis. Chlorophyll a, b, carotenoid and total of foliage leaf were greater under cut off irrigation conditions. Deep understanding of biochemical responses of wheat cultivars to late season drought stress and its interaction with plant growth regulator needs further complimentary research.
yaemam@gmail.com
Bahareh Kashefi, Elham Ahmadian,
Volume 7, Issue 24 (8-2018)
Abstract
In order to investigation effect of hexaconazole in some morpho- physiological traits of Althaea officinalis in drought stress, the experiment was conducted factorial in the base of complete randomized design with four replications in greenhouse of Islamic Azad university of Neyshabur branch in 2012- 2013. Treatments were drought (50%) and control (100%) field capacity and sparying of hexaconazole solution in two concentrations (15 and 25 mg/L) and control. Sampling was done about 125 days after growing, before reproductive growth stage. In the base of comparison of means, drought stress the reduction of other traits except root length, content of proline, protein and catalase activity. The interaction between drought and hexaconazole were significant on the number and leaf area, stem length, stem to root ratio, fresh and dry weight, proline content and activity of peroxidase enzyme. Also, 15 mg/L concentration of hexaconazole compared to other levels, increasing the contents of root length, soluble carbohydrates and protein. Also, number of leaf, stem length, proline and peroxidase enzyme content had decreasing in lower level than higher level of hexaconazole. In the base of the results, high concentrations of triazole compounds can be made further increase growth on Marshmallow in drought conditions as a substance that can be used to reduce the effects of stress.
Mr Ahmad Rajabi Dehnavi, Dr Morteza Zahedi,
Volume 9, Issue 35 (4-2020)
Abstract
A pot experiment was conducted during spring and summer of 2017 at collage of agriculture of Isfahan University of Technology, Esfahan, Iran, in order to evaluate the effects of different concentrations of foliar ascorbic acid application on the response of sorghum (speedfeed cultivar) to salinity. Treatments included two salinity levels (0 and 100 mM NaCl) and five concentrations of ascorbic acid (0, 50, 100, 150 and 200 mg/l). Treatments were arranged as factorial based on a completely randomized design with four replications. Salinity decreased potassium concentration, potassium/ sodium ratio, chlorophyll and carotenoid contents and shoot and root dry weights, while salt enhanced the concentrations of sodium and proline and the activities of antioxidant enzymes catalase, superoxide dismutase and ascorbate peroxidase. The decreases due to salinity at 0, 50, 100, 150 and 200 mg/l concentrations of ascorbic acid were 30, 27, 24, 27 and 20 percent, respectively. Foliar application of ascorbic acid improved plant growth parameters, the concentrations of proline and the activities of antioxidant enzymes while decreased sodium concentrations in sorghum plants. The highest increase in plant dry matter due to the application of ascorbic acid in both non-saline (30%) and saline (41%) conditions were obtained at 100 mg/l ascorbic acid. The increases due to ascorbic acid application in the antioxidant enzyme activity were greater for superoxide dismutase and ascorbate peroxidase as compared to catalase. Based on the results of this experiment, ascorbic acid application not only improved the growth of sorghum plants, but also alleviated the negative effects of salinity in this plant.
Sakineh Tavakoli, Jafar Amiri, Mohsen Barin,
Volume 10, Issue 45 (12-2021)
Abstract
Boron is an essential plant micronutrient that is involved in the cell wall and membrane structure and functioinig. Boron is often found in high concentrations in association with agriculture in arid and semi-arid regions. In order to investigate the effect of zinc sulfate on some morphological, physiological and biochemical characteristics of two grapvine cultivars under toxicity of boron, a greenhouse experiment was conducted taking into account three factors of two grapevine cultivars (Ghezel Ozum and Hosseini), four levels of boric acid (nutrient solution including 0.25 (control)), 2.5, 5 and 10 mg l-1 and tree levels of zinc sulfate (foliar spray), 0 (control), 3 and 6 g l-1 in a factorial based on randomized complete design of four replicates for six months. The results indicated that leaf fresh weight in treatments of 5 and 10 mg l-1 boron (without zinc sulfate) were 68.55 and 49%, respectively and leaf dry weight in treatments of 5 and 10 mg l-1 boron (without zinc sulfate) decreased by 65.44 and 86.9%, respectively, compared to the control. With an increas in boric acid levels, the content activities of catalase enzymes, proline, soluble sugars, and total protein in plant tissues were increased. At a concentration of 6 g l-1 zinc sulfate and 10 mg l-1 boron, the amount of soluble sugar in Ghezel Ozum cultivar increased 6.35 times and in Hosseini cultivar increased 5.3 times compared to the control treatment. With the application of 6 g l-1 zinc sulfate, the amount of total protein at the level of 5 mg l-1 boron increased 1.53 times and at the level of 10 mgl-1 boron, the amount increased 1.77 times compared to the control. Boron toxicity also reduced the concentrations of No3-, Ca2+, Mg2+ and Fe2+ but increased boron levels in both cultivars. The lowest amount of iron was observed in both cultivars at 10 mg l-1 boron. The highest amount of leaf boron (200.51 mg kg-1 dry matter) was observed at a concentration of 10 mg l-1 boron. Under toxicity of boron, application of Zinc sulfate caused increase in growth efficiency, antioxidant enzymes activites and the amount of compatible osmolites but reduced accumulation of boron ions in two cultivars. In conclusion, Hosseini was more tolerant with respect to most characters as compared to Ghezel Ozum and the application of zinc sulfate ameliorated the adverse effects of boron toxicity, in both cultivars.
