The effects of Ultraviolet Radiation on some Growth Parameters, Pigments content and Antioxidant Enzymes Activity at early Developmental stages of Dracocephalum moldavica

Author: Sima Jabbarzadeh, Rouhollah Motafakkerazad, Hanieh Mohajjel Shoja and Elham Mohajel Kazemi

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Abstract

During the last decades, damaging of ozone layer results in the effect of solar UV radiation on the earth. The increase of ultraviolet radiation can have many direct or indirect deleterious effects on the living organisms. To study of enhanced ultraviolet radiation (under 320nm) effects we assayed some growth parameters, pigments and antioxidant activities of Dracocephalum moldavica as herbal medicine in 2-4 pair leaf stage. The plants were exposed to six doses of UV radiation (7, 15, 22, 30, 37, 51 kjm-2d-1). Data were analyzed using SPSS software and ANOVA test. Results of this experiment showed that UV doses decreased growth parameters of root and shoot (fresh and dry weight, length of root and shoot) and pigments contents (chlorophyll a, chlorophyll b and Total chlorophyll). Based on the results, there are significant increase in the amount of carotenoids and anthocyanins in high dosages of UV radiation. However the highest doses of UV enhanced activity of catalase and peroxidase b

Keywords

Dracocephalum moldavica, UV, growth parameters, pigments, antioxidant enzymes

Conclusion

The plants have several mechanisms against the deleterious effects of UV radiation which include a combination of damaging, repairing and tolerance, but this relevance is less known. Protective mechanisms against UV damage in plants is depends on plant species. The present study suggested that, D. moldavica is sensitive plant against high UV dosages. The increased activity of catalase, peroxidase and ascorbate peroxidase in high doses of UV treatment and the increased amount of anthocyanins and carotenoids in same doses shows the plant sensitivity levels in front of UV exposure and shows combination of enzymatic and non-enzymatic defence mechanisms, which decreased the effects of radiation damage in higher doses. Chlorophyll values and SOD decreasing in same doses with upper mentioned results of enzymes and pigments supported the mentioned mechanism of plant defence system against under 320 nm UV radiation. More studies should be done to understand the precise plant defence system aga

References

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How to cite this article

Sima Jabbarzadeh, Rouhollah Motafakkerazad, Hanieh Mohajjel Shoja and Elham Mohajel Kazemi (2018). The effects of Ultraviolet radiation on some growth parameters, pigments content and antioxidant enzymes activity at early developmental stages of Dracoceph