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Showing 2 results for Raeisi Sadati

Pariya Nouri, Sodabeh Jahan Bakhsh, Salim Farzaneh, Seyedeh Yalda Raeisi Sadati, Saeid Heydarzadeh,
Volume 13, Issue 60 (vol. 13, no. 60 2024)
Abstract

Salinity is one of the most important environmental stresses, the increasing spread of which reduces the growth and yield of agricultural plants, in this regard, identifying sugar beet cultivars tolerant to salinity stress to improve quantitative and qualitative yield is of particular importance. For this purpose, research was conducted to investigate the physiological characteristics of some sugar beet genotypes under salt stress in 2019. This experiment was carried out factorially in the form of randomized complete blocks with three replications in Mohaghegh Ardabili University under greenhouse conditions. The experimental factors included different genotypes of sugar beet (9 genotypes) as the first factor and salinity stress as the second factor at four levels (control and 4, 8 and 12 dS/m). The results showed that the effects of salinity stress on chlorophyll content, soluble protein, proline content, soluble sugars and the activity of antioxidant enzymes (catalase, peroxidase and polyphenol oxidase) of different sugar beet cultivars were significant. Higher levels of salinity stress (12 dS/m) caused a significant increase in soluble protein, proline content, soluble sugars and activity of catalase, peroxidase and polyphenol oxidase enzymes compared to other levels of salinity stress and the control treatment. Whereas, the highest content of chlorophyll a, b and total chlorophyll was observed in cultivars number 15 and 4 in the treatment of not applying salt stress. Among the studied genotypes, genotypes No. 6, 15 and 20 had the highest activity of antioxidant enzymes under the condition of 12 dS/m salinity stress. Therefore, at higher levels of salinity stress, resistant sugar beet cultivars prevent the reduction of photosynthetic pigment content by improving the content of compatible osmolytes and antioxidant activities through correct membrane structure.
Alireza Shahbazi, Sodabeh Jahanbakhsh Godehkahriz, Seyedeh Yalda Raeisi Sadati,
Volume 13, Issue 63 (vol. 13, no. 63 2024)
Abstract

Evaluation of the tolerance of different wheat cultivars to environmental stresses, especially salinity stress, and its effect on wheat in different stages of growth is an important factor in choosing them for cultivation under these stress conditions. Therefore, knowing the mechanisms of tolerance to salt stress in wheat will help to choose suitable cultivars for cultivation in areas that are exposed to this stress. The present study was evaluated with the aim of investigating the effect of salinity stress on different varieties of wheat in order to identify the mechanisms involved in the transmission of the defense message of this plant from the biochemical and molecular aspects. The experiment was conducted in a factorial manner based on a completely randomized design, with three replications in the greenhouse of the Faculty of Agriculture of the University of Mohaghegh Ardabili. The investigated factors include salinity stress at three levels (zero, 100 and 150 mM sodium chloride (NaCl)), six wheat cultivars (Quds, Azadi, Arg, Tajen, Flat and Bam) and sampling time (before applying stress was 7, 14 and 21 days after application of salt stress). From the two-leaf stage onwards, the samples of the salinity stress level for the first three days were stressed with salt solution, every day with a concentration of 50 mM, so that the plants would not be shocked by sudden salinity stress. After 3 days, the plants were exposed to stress with concentrations of 100 and 150 mM sodium salt, and normal water was used for the control treatment. The results showed that the amount of proline, total protein, lysine and methionine increased with the increase in salinity stress. Also, under salinity stress, protein accumulation was higher in Bam, Arg and Plat cultivars than Tajen, Quds and Azadi cultivars. As a result, the numbers deal with the toxicity caused by salinity by using different defense mechanisms. In general, according to the results of this research, it can be concluded that salinity changed the studied biochemical traits, and among the cultivars studied, the Arg cultivar showed more tolerance to salinity stress. Also, in general, the accumulation of proteins in Bam, Arg and Plat varieties was higher than Tajn, Quds and Azadi varieties.

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