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تأثیر آلودگی کروم (VI)، کادمیوم و سرب بر ترکیب عناصر مغذی در نهال های یکسالۀ تبریزی و سپیدار | ||
| نشریه محیط زیست طبیعی | ||
| مقاله 8، دوره 68، شماره 4، دی 1394، صفحه 609-618 اصل مقاله (222.15 K) | ||
| نوع مقاله: مقاله پژوهشی | ||
| شناسه دیجیتال (DOI): 10.22059/jne.2015.56933 | ||
| نویسنده | ||
| سید مهدی علی زاده* | ||
| استادیار دانشکده کشاورزی دانشگاه کشاورزی و منابع طبیعی رامین خوزستان | ||
| چکیده | ||
| فلزات سنگین جزء آلایندههای روزافزون محیط زیست محسوب میشوند. این آلایندهها به‌راحتی توسط گیاهان جذب و به‌منزلۀ عوامل قوی تنشزا برای متابولیسم گیاه قلمداد میشوند. فلزات سنگین از طریق رقابت با عناصر مغذی تأثیر بسزایی در توزیع آنها در گیاه دارند. هدف پژوهش حاضر بررسی تأثیر سطوح افزایشی آلودگی کروم (VI)، کادمیوم و سرب بر ایجاد عدم تعادل در وضعیت عناصر مغذی در برگ و ساقه/شاخه دو گونه از صنوبر (تبریزی و سپیدار) بود. آزمایش بهصورت کاشت نهالهای صنوبر در گلدانهای حاوی خاک آلوده به هر یک از فلزات سنگین انجام شد. نتایج نشان داد که فلزات سنگین سبب کاهش غلظت کلیۀ عناصر مغذی در برگ و ساقه/شاخۀ نهالها شدند (05/0>P). گونۀ تبریزی در قیاس با گونۀ سپیدار نسبت به آلودگی کروم (VI) و کادمیوم حساستر بود. بالاترین و پایینترین تأثیر منفی بر جذب عناصر غذایی توسط نهالها به‌ترتیب متعلق به کادمیوم و سرب بود. آلودگی 150 میلیگرم بر کیلوگرم کادمیوم سبب کاهش 65 درصدی در غلظت پتاسیم برگی نهالهای تبریزی شد. کاهش 78 درصدی در جذب فسفر در نهالهای تبریزی نیز در حضور 150 میلیگرم بر کیلوگرم کادمیوم در مقایسه با شاهد رخ داد. مکانیسمهای کنشهای متقابل بین فلزات سنگین و عناصر مغذی بسیار پیچیده است و بهطور جزئی شناسایی شده است. اطلاعات در مورد مکانیسم چرخش عناصر غذایی کمک شایانی به حل مشکلات پروژههای گیاهپالایی تحت تنش فلزات سنگین خواهد کرد. | ||
| کلیدواژه‌ها | ||
| آلاینده؛ فلزات سنگین؛ کنش متقابل؛ گیاه پالایی؛ متابولیسم گیاهی | ||
| عنوان مقاله [English] | ||
| Impact of Cr (VI), Cd and Pb Contamination on Nutrient Composition of One-year old Populus ssp. Seedlings | ||
| نویسندگان [English] | ||
| Seyed Mahdi Alizadeh | ||
| چکیده [English] | ||
| Heavy metals are aggressive environmental pollutants. They are easily taken up by plants and they are strong stress factors for plant metabolisms. Heavy metals influence includes also disturbances in plant mineral nutrition by competition with other nutrients. The specific objective of this research work was to study whether elevated Cr (VI), Cd and Pb Contamination caused an unbalanced nutritional status of leaves and stems/shoots in two poplar species (P. nigra L. and P. alba L.). The experiment was carried out on a pot culture of poplars, growing in an enriched heavy metal soil. The results indicated that Heavy metal enrichments reduced the concentration of all foliar and stem/shoot nutrients (P≤0.05). P.nigra L. in comparison with P. alba L. was more sensitive to Cd and Cr (VI) contamination. The highest and the lowest negative effects on nutrient uptake were belonging to Cd and Pb respectively. Cd contamination at 150 mg kg-1 level lead to 65% reduction in foliar concentration of K in P. nigra L. In presence of 150 mg kg-1 Cd, 78% reduction was observed in P. nigra L. P uptake compare to control. The knowledge about regulatory mechanisms in plant mineral nutrition may help us to solve the problem of plant detoxification during heavy metal stress. However the mechanisms of heavy metal interactions are very complex and still only fragmentarily known. | ||
| کلیدواژه‌ها [English] | ||
| Heavy metal, Pollutant, Plant metabolism, Plant detoxification, Interaction | ||
| مراجع | ||
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