کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
6312439 1618973 2013 7 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Assessing the effect of copper on growth, copper accumulation and physiological responses of grazing species Atriplex halimus: Ecotoxicological implications
موضوعات مرتبط
علوم زیستی و بیوفناوری علوم محیط زیست شیمی زیست محیطی
پیش نمایش صفحه اول مقاله
Assessing the effect of copper on growth, copper accumulation and physiological responses of grazing species Atriplex halimus: Ecotoxicological implications
چکیده انگلیسی

Tolerance of plants to elevated concentrations of heavy metals in growth media and in its tissues leads to high degrees of metal bioaccumulation, which may pose a risk for humans and animals alike. Therefore, bio-accumulating plants need thorough evaluation from an environmental health point of view. A glasshouse experiment concerning the xerohalophyte Atriplex halimus was carried out to determine its tolerance and capacity to accumulate copper. We investigated the effect of Cu from 0 to 30 mmol l−1 on the growth, photosynthetic apparatus and nutrient uptake of A. halimus by measuring gas exchange, chlorophyll fluorescence and photoinhibition. We also determined total Cu, sodium, potassium, magnesium, phosphorous, and nitrogen content in the plant. Our results indicated that A. halimus presented a high resistance to Cu-induced stress, since the plants were able to survive at concentrations higher than 15 mmol l−1 Cu. However, this capacity was not reflected in its ability to accumulate and tolerate greater amounts of Cu in its tissues, since clear phytotoxicity symptoms were detected at tissue concentrations greater than 38 mg kg−1 Cu. Thus, Cu increment caused a reduction in A. halimus growth, which was related to a decrease in net photosynthetic rate. This reduction was associated with the adverse effect of Cu on the photochemical apparatus and the reduction in the absorption of essential nutrients. The high resistance of A. halimus was largely related with the capacity of this species to avoid the absorption of great amounts of Cu. For all the above reasons, A. halimus could have the characteristics of a Cu-exclusion plant.

► Copper tolerance and accumulation capacity Atriplex halimus were analyzed. ► A. halimus was able to survive at concentrations greater than 15 mmol l−1. ► Its tolerance was related with its capacity to avoid the absorption of great amounts of Cu. ► A. halimus could have the basic characteristics of a Cu-exclusion plant. ► These characteristics should reduce health risks in Cu polluted environments.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Ecotoxicology and Environmental Safety - Volume 90, 1 April 2013, Pages 136-142
نویسندگان
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