Document Details
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Document Type |
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Thesis |
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Document Title |
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Physiological and Biochemical Responses of (ع) الاستجابات الفسيولوجية وا لكيموحيوية لنباتات الفاصوليا لإجهاد المعادن الثقيلة |
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Subject |
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Physiological and Biochemical Responses of |
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Document Language |
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Arabic |
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Abstract |
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Some heavy metals are essential and important for plants growth, and in small concentrations, they play as key components of many vital compounds. However, when increasing concentrations more than permitted, they show symptoms such as growth delay and inhibition of the biochemical reactions. The current investigation focused on the impact of five heavy metals (lead, chromium, nickel, cadmium, zinc) on the growth and performance of common bean (Phaseolus vulgaris L. cv. Nebraska) plants before and after liming (CaCO3 + MgCO3) as soil correction treatment for the sake of the remediation of heavy metal pollution in the soil. The four-week-old common bean plants were subjected to the aqueous concentration (200 ppm) of the heavy metal salts (lead acetate, potassium dichromate, nickel chloride, cadmium chloride, zinc sulphate) for a group of plants without liming and another group after liming (0.2 M) for two weeks. The chemical analysis of carbohydrates showed significant increases in the contents of reducing sugars in response to lead, cadmium and nickel stress, which were decreased by liming treatments. The contents of total soluble sugars also increased in all heavy metal-treated plants but zinc. All heavy metals (Lead, chromium, nickel, cadmium and zinc) significantly lowered the leaf contents of the photosynthetic pigments (Chlorophyll a, chlorophyll b and carotenoids). The SDS-PAGE of proteins indicated both qualitative and quantitative variations in the profile of electrophoretic protein bands in heavy metal-stressed common bean plants before and after liming. In conclusion, the results indicate that the investigated heavy metals were absorbed from the soil solution, then accumulated in the tissues of common bean plants in variable concentrations. The highest in accumulation were lead (Pb) and chromium (Cr) then cadmium (Cd), zinc (Zn) and nickel (Ni) in the order: Pb > Cr > Cd > Zn > Ni; while the magnitude of limiting in retarding the rate of absorption and accumulation was: Pb > Ni > Cr > Zn > Cd, respectively. |
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Supervisor |
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(E) Prof. Dr. Mohammad Salahaldin Beltaji |
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Thesis Type |
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Master Thesis |
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Publishing Year |
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1432 AH
2011 AD |
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Number Of Pages |
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99 |
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Added Date |
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Monday, January 5, 2015 |
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Researchers
| نجوى فيصل الدوبي | Aldoobie, Najwa Faisal | Investigator | Master | |
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