کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
8353843 | 1541915 | 2016 | 9 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Physiological and biochemical mechanisms preventing Cd-toxicity in the hyperaccumulator Atriplex halimus L.
دانلود مقاله + سفارش ترجمه
دانلود مقاله ISI انگلیسی
رایگان برای ایرانیان
کلمات کلیدی
iWUEsteady state fluorescence yieldAntioxidative enzyme activityNPQCATRGRCx + cChl bChl aPSIISLAGPXFv/Fm - Fv / FmROS - ROSmaximum quantum efficiency of PSII photochemistry - حداکثر بازده کوانتومی فتوشیمی PSIIIntrinsic water use efficiency - راندمان مصرف آب ذاتیSOD - سدSpecific leaf area - سطح برگ مخصوصminimal fluorescence level in the dark-adapted state - سطح فلورسانس حداقل در حالت تاریک سازگار استmaximal fluorescence level in the dark-adapted state - سطح فلورسنت حداکثر در حالت تطبیق تاریکیvariable fluorescence level in the dark-adapted state - سطح فلورسنت متغیر در حالت تطبیقی تاریکSuperoxide dismutase - سوکسوکس دیسموتازPhotoinhibition - عکسبرداریintercellular CO2 concentration - غلظت CO2 بین سلولیPhotosynthesis - فتوسنتزFluorescence - فلورسنسMineral nutrients - مواد مغذی معدنیRelative growth rate - نرخ رشد نسبیnet photosynthetic rate - نرخ فتوسنتزی خالصStomatal conductance - هدایت گرمایشیGrowth parameters - پارامترهای رشدCatalase - کاتالازCarotenoids - کاروتنوئیدهاChlorophyll a - کلروفیل achlorophyll b - کلروفیل بguaiacol peroxidase - گوایاکول پراکسیدازReactive oxygen species - گونههای فعال اکسیژن
موضوعات مرتبط
علوم زیستی و بیوفناوری
علوم کشاورزی و بیولوژیک
دانش گیاه شناسی
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
The xero-halophyte Atriplex halimus L., recently described as Cd-hyperaccumulator, was examined to determine Cd toxicity threshold and the physiological mechanisms involved in Cd tolerance. An experiment was conducted to investigate the effect of cadmium from 0 to 1350 μM on chlorophyll fluorescence parameters, gas exchange, photosynthetic pigment concentrations and antioxidative enzyme activities of A. halimus. Cadmium, calcium, iron, manganese, magnesium, potassium, phosphorous, sodium and zinc concentrations were also analyzed. Plants of A. halimus were not able to survive at 1350 μM Cd and the upper tolerance limit was recorded at 650 μM Cd; although chlorosis was observed from 200 μM Cd. Cadmium accumulation increased with increase in Cd supply, reaching maxima of 0.77 and 4.65 mg gâ1 dry weight in shoots and roots, respectively, at 650 μM Cd. Dry mass, shoot length, specific leaf area, relative growth rate, net photosynthetic rate, stomatal conductance, pigments contents and chlorophyll fluorescence were significantly reduced by increasing Cd concentration. However, the activities of superoxide dismutase (SOD; EC1.15.1.1), catalase (CAT; EC1.11.1.6) and guaiacol peroxidase (GPx; EC1.11.1.7) were significantly induced by Cd. Exposures to Cd caused also a significant decrease in P contents in roots, Mg and Mn contents in shoots and Fe and K contents in roots and shoots and had no effect on Ca, Na and Zn contents. The tolerance of A. halimus to Cd stress might be related with its capacity to avoid the translocation of great amounts of Cd in its aboveground tissues and higher activities of enzymatic antioxidants in the leaf.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Plant Physiology and Biochemistry - Volume 106, September 2016, Pages 30-38
Journal: Plant Physiology and Biochemistry - Volume 106, September 2016, Pages 30-38
نویسندگان
Mohammed Mesnoua, Enrique Mateos-Naranjo, José MarÃa Barcia-Piedras, Jesús Alberto Pérez-Romero, Brahim Lotmani, Susana Redondo-Gómez,