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首页> 外文期刊>Environmental Science & Technology >Toxicity and Deficiency of Copper in Elsholtzia splendens Affect Photosynthesis Biophysics, Pigments and Metal Accumulation
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Toxicity and Deficiency of Copper in Elsholtzia splendens Affect Photosynthesis Biophysics, Pigments and Metal Accumulation

机译：锦葵中铜的毒性和缺乏影响光合作用的生物物理，色素和金属积累

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摘要

Elsholtzia splendens is a copper-tolerant plant species growing on copper deposits in China. Spatially and spectrally resolved kinetics of in vivo absorbance and chlorophyll fluorescence in mesophyll of E. splendens were used to investigate the copper-induced stress from deficiency and toxicity as well as the acclimation to excess copper stress. The plants were cultivated in nutrient solutions containing either Fe(Ⅲ)-EDTA or Fe(Ⅲ)-EDDHA. Copper toxicity affected light-acclimated electron flow much stronger than nonphotochemical quenching (NPQ) or dark-acclimated photochemical efficiency of PSIIRC (F_v/F_m). It also changed spectrally resolved Chl fluorescence kinetics, in particular by strengthening the short-wavelength (<700 nm) part of NPQ altering light harvesting complex Ⅱ (LHCII) aggregation. Copper toxicity reduced iron accumulation, decreased Chls and carotenoids in leaves. During acclimation to copper toxicity, leaf copper decreased but leaf iron increased, with photosynthetic activity and pigments recovering to normal levels. Copper tolerance in E. splendens was inducible; acclimation seems be related to homeostasis of copper and iron in E. splendens. Copper deficiency appeared at 10 mg copper per kg leaf DW, leading to reduced growth and decreased photosynthetic parameters (F_0, F_v/F_m, Φ_(psu)). The importance of these results for evaluating responses of phytoremediation plants to stress in their environment is discussed.
机译：Elsholtzia splendens是一种耐铜植物，生长在中国的铜矿床上。利用空间和光谱解析的动力学方法，研究了脾脏叶肉中吸光度和叶绿素荧光的动力学，研究了铜诱导的胁迫的缺乏和毒性以及对过量铜胁迫的适应性。在含有Fe（Ⅲ）-EDTA或Fe（Ⅲ）-EDDHA的营养液中种植植物。铜毒性影响的光适应电子流比PSIIRC的非光化学猝灭（NPQ）或暗适应光化学效率（F_v / F_m）强得多。它也改变了光谱分辨的Chl荧光动力学，特别是通过增强NPQ的短波长（<700 nm）部分改变了光捕获复合物Ⅱ（LHCII）的聚集。铜毒性降低了铁的积累，降低了叶片中的Chls和类胡萝卜素。在适应铜的毒性过程中，叶片的铜减少，叶片的铁增加，光合作用和色素恢复到正常水平。脾草中的铜耐受性是可诱导的。驯化似乎与sp草中铜和铁的体内稳态有关。铜缺乏出现在每千克叶片DW 10 mg铜时，导致生长减少和光合参数降低（F_0，F_v / F_m，Φ_（psu））。讨论了这些结果对于评估植物修复植物对环境压力的反应的重要性。

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  • 来源
    《Environmental Science & Technology》 |2013年第12期|6120-6128|共9页
  • 作者

    Hongyun Peng; Peter M. H. Kroneck; Hendrik Kuepper;

  • 作者单位

    Key Laboratory of Environmental Remediation and Ecological Health, Ministry of Education, College of Environmental & Resource Sciences, Zhejiang University, Zijingang Campus, No. 866 Yuhangtang Rd, Hangzhou 310058, China,Department of Biology, University of Konstanz, D-78457 Konstanz, Germany;

    Department of Biology, University of Konstanz, D-78457 Konstanz, Germany;

    Department of Biology, University of Konstanz, D-78457 Konstanz, Germany;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
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