Effect of Drought Stress on Antioxidant Enzymes Activities and Some Physiological Traits in Chickpea (Cicer Arietinum L.)
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Article Type:
Research/Original Article (دارای رتبه معتبر)
Abstract:

The aims of this study to assess the response of chickpea genotypes to drought stress in terms of physiological parameters and subsequent biochemical changes for more understand of drought resistance mechanisms in plants and accession to better genetic resources. Investigation were of 5 chickpea genotypes under 100, 65 and 30 percent of field capacity at two sampling time i.e. 7 and 14 days after stress induction (in 4 to 6 leaves stage). The experiment design factorial split-plot in time experiment in a completely randomized design with three replications at greenhouse of college of agriculture and natural resource of University of Tehran in 2013. Results showed that there were significant differences among genotypes, stress levels, duration of stress and interaction among them. Drought stress reduced the relative water content (RWC) and electrolyte leakage (EL) significantly. The electrolyte leakage rate under drought stress conditions in drought-tolerant genotypes is usually less than sensitive genotypes; genotypes of 998 and 606 are resistant to this and genotype of 357 are sensitive. Increase of the duration of stress, reduced the activity of the antioxidant enzymes. According to the results, the catalase (CAT) and ascorbate peroxidase (APX) enzymes activity in both periods increased in higher drought stress. Activity of superoxide dismutase (SOD) decreased with increasing tension stress. In elevated density of stress, guaiacol peroxidase (GPX) enzyme activity increased to 65% crop capacity in both periods. However, compared to 65%, the enzyme activity decreased at 30% stress level. In regard, the responses of all genotypes were not the same and some genotypes had an elevating trend. Genotypes 606 and 998 showed more activity level in enzymes of catalase, ascorbate peroxidase and superoxide dismutase under stress condition and but genotype 357 had a less value. The activity guaiacol peroxidase in genotypes of 236 and 357 had the highest and lowest activity, respectively. Under drought stress conditions, the activity of antioxidant enzymes was more in tolerant plants than others. Given that the activity of catalase, ascorbate peroxidase and superoxide dismutase enzymes were highest in genotypes 606 and 998, so they were introduced as drought tolerant genotypes in this experiment. The genotype 357, with the lowest enzyme activity, was introduced as a susceptible genotype. Of course, the reaction of plants to drought stress varies considerably depending on the severity and duration of the stress, and also plant type and growth stage.

Language:
Persian
Published:
Journal of Crop Breeding, Volume:11 Issue: 30, 2019
Pages:
11 to 22
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