کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
10841839 | 1067902 | 2005 | 9 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Effects of cadmium hyperaccumulation on physiological characteristics of Sedum alfredii Hance (Crassulaceae)
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کلمات کلیدی
ABSTR0/RCALAFv/F0DI0/RCET0/RCABS/RC - ABS / RCSedum alfredii - alfredii سبزFv/Fm - Fv / Fmδ-aminolevulinic acid - اسید δ-آمینولولولینیکHyperaccumulator - بیش از حدTolerance - تلرانس maximum fluorescence - حداکثر فلورسنسCAM - ساخت به کمک کامپیوترChlorophyll - سبزینه یا کلروفیلinitial fluorescence - فلورسانس اولیهVariable fluorescence - فلورسانس متغیرChlorophyll fluorescence - فلورسانس کلروفیلCrassulacean Acid Metabolism - متابولیسم اسید Crassulaceanreaction center - مرکز واکنشCadmium - کادمیم
موضوعات مرتبط
علوم زیستی و بیوفناوری
علوم کشاورزی و بیولوژیک
دانش گیاه شناسی
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
Sedum alfredii is a newly found cadmium (Cd)-hyperaccumulator, but there have been no detailed studies on its physiological responses when Cd is hyperaccumulated. Leaf expansion and root growth were inhibited significantly at high Cd concentrations, and Cd was suggested to suppress cell expansion and induce senescence. Chlorophyll fluorescence analysis indicated that its photosynthesis appeared to be unaffected. Decreased Fv/Fm correlated well with decreased water content of leaves. Cd treatments were demonstrated to result in an increase of chlorophyll content. The chlorophyll a/b ratio showed a reduction with increasing Cd concentrations. The Cd content peaked and reached a maximum of 11,000 mg kgâ1 in leaves at 600 μM Cd. It was almost saturated at 600 μM Cd in stems and roots, and then was, respectively, up to a maximum of 5300 and 3100 mg kgâ1 at 800 μM Cd. Fe concentrations in leaves, stems and roots increased significantly in the presence of Cd. Increasing Cd concentration might induce the expression of Fe transporter. This could have important implications both for human nutrition and for phytoremediation of metal contamination. Other elements (K, Ca, Zn and P) were distributed differently. Taking together, these results suggested that S. alfredii could be a good new model to investigate the mechanism of metal hyperaccumulation.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Plant Science - Volume 169, Issue 4, October 2005, Pages 737-745
Journal: Plant Science - Volume 169, Issue 4, October 2005, Pages 737-745
نویسندگان
Wenbin Zhou, Baosheng Qiu,