Volume 5, Issue 2 ((Autumn & Winter) 2019)                   Iranian J. Seed Res. 2019, 5(2): 15-28 | Back to browse issues page


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Tabatabaei A, Ansari O. Evaluation of Germination and Biochemical Changes of Two Wheat (Triticum aestivum) Cultivars Under Pb(NO3)2 Stress. Iranian J. Seed Res.. 2019; 5 (2) :15-28
URL: http://yujs.yu.ac.ir/jisr/article-1-247-en.html
Gorgan University of Agricultural Science and Natural Resources , ansari_o@ut.ac.ir
Abstract:   (2410 Views)

DOR: 98.1000/2383-1251.1397.5. 15.10.2.1575.1576

Extended abstract
Introduction: Heavy metal pollution is one of the most serious environmental problems. These metals which accumulate in food chain bring about a lot of hazards to both humans and animals. Among heavy metals, lead is considered to be the most dangerous heavy metal in the environment. It contaminates the environment through the lead-acid battery industry, paint and gasoline additives, insecticides, chemical fertilizers, car exhaust pipes and soldering. The objective of this study was to investigate the effect of Pb(NO3)2 on germination characteristics and biochemical changes of two wheat cultivars (Chamran and Kohdasht cultivars).
Materials and Methods: The objective of this research was to evaluate germination and biochemical changes of two wheat cultivars under Pb(NO3)2 stress, using three-parameter sigmoid model. The experimental design adopted was factorial with a completely randomized design, as the base design, with 3 replications. The first factor was 2 wheat cultivars (Kohdasht and Chamran), and the second factor was 6 levels of Pb(NO3)2 (0, 0.25, 0.5, 0.75, 1 and 1.5 mg.L).
Results: The results showed that with increases in levels of Pb(NO3)2 stress, germination percentage, germination rate, normal seedling percentage, seedling length, seedling weight and seed vigor index reduced for both wheat cultivars. The results of fitting three-parameter sigmoidal to characteristics indicated that the highest characteristics and X50 were obtained from the Chamran cultivar. The highest germination percentage (96%), germination rate (23 seeds per day), normal seedling percentage (93.33%), seedling length (13.07 cm), seedling weight (0.07) and seedling vigor index (12.18) were obtained from the Chamran cultivar under non-stress conditions. Pb(NO3)2 stress increased proline and catalase activity but reduced protein, proline and protein for the Chamran cultivar, as compared with the Kohdasht cultivar.
Conclusion: Generally speaking, the results showed that Pb(NO3)2 had a significant effect on germination characteristics and catalase, proline and protein of wheat. Finally, it could be said that in copper-accumulated areas, choosing proper cultivars can slightly mitigate the damages caused by copper. The Chamran cultivar seems to be a better candidate for these conditions.
 
Highlights:

  1. Evaluation of the effect of Pb(NO3)2 stress on germination characteristics of wheat.
  2. Using three-parameter sigmoid model for the evaluation of biochemical changes and germination of wheat under Pb(NO3)2 stress.
Full-Text [PDF 478 kb]   (315 Downloads)    
Type of Study: Research | Subject: Seed Ecology
Received: 2018/02/2 | Accepted: 2018/06/23

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