Physiological and Molecular Mechanisms of Mn Uptake by HyperaccumultingPlant Polygonum hydropiper (Polygonaceae)

doi:10.3724 SP.J.1143.2008.07265

Plant Diversity ›› 2008, Vol. 30 ›› Issue (04): 489-495.DOI: 10.3724 SP.J.1143.2008.07265

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Physiological and Molecular Mechanisms of Mn Uptake by Hyperaccumulting
Plant Polygonum hydropiper (Polygonaceae)

WANG Hua^{1 , 2}, TANG Shu-Mei¹, LIAO Xiang-Jun³ , CAO Qi-Min⁴

1 College of Agronomy , Hainan University, Danzhou 571737 , China ; 2 Institute of Spice and Beverage Research , Chinese Academy of Tropical Agricultural Sciences, Wanning 571533 , China ; 3 Bureau of Geological Exploration of Hainan Province , Haikou 570100, China ; 4 Shool of Environmental Science and Engineering , Sun Yat-Sen University , Guangzhou 510275 , China

Received:2007-11-08 Online:2008-08-25 Published:2008-08-25
Contact: TANG Shu-Mei

超积累植物水蓼吸收锰的生理与分子机制

王华^{1 , 2} , 唐树梅¹, 廖香俊³ , 曹启民⁴

1 海南大学农学院, 海南儋州 571737 ; 2 中国热带农业科学院香料饮料研究所, 海南万宁 571533;
3 海南省地质勘查局, 海南海口 570100 ; 4 中山大学环境科学与工程学院, 广东广州 510275

通讯作者: 唐树梅

Abstract

Abstract: Polygonum hydropiper; Mn; Hyperaccumulation; Distribution; Speciation; Physiological response

Key words: Polygonum hydropiper

摘要： 水蓼( Polygonum hydropiper) 是一种新近发现的锰超积累植物。本文通过营养液模拟试验, 研究了锰在水蓼细胞中的分布与化学形态特征, 以及锰胁迫下水蓼的生理生化响应机制。结果表明: 锰在水蓼叶片非活性代谢部分( 细胞壁和液泡) 的积累是其解毒耐锰的主要机制之一; 水蓼叶片中的锰大部分以水溶性有机盐或草酸锰的形态存在; 在锰浓度处理为8 000μmol􊄯L 时, 叶绿素a 含量显著降低, 而在其它处理条件下, 叶绿素a 无明显变化; 在锰处理≤5 000 μmol/L 时水蓼叶片的细胞膜还没有受到明显伤害; 水蓼叶片的可溶性蛋白含量随锰处理浓度不同而变化, 说明植物在代谢和结构上发生了调整; 随锰处理浓度的增加, 水蓼叶片SOD 和POD 活性提高, 保护酶活性的提高又可清除活性氧自由基, 这是水蓼耐高锰和累积锰的一种生理响应机制。

关键词: 水蓼, 锰, 超积累, 分布, 形态, 生理响应

CLC Number:

Q 945

WANG Hua^,, TANG Shu-Mei, LIAO Xiang-Jun , CAO Qi-Min. Physiological and Molecular Mechanisms of Mn Uptake by Hyperaccumulting
Plant Polygonum hydropiper (Polygonaceae)[J]. Plant Diversity, 2008, 30(04): 489-495.

王华1 , 2 , 唐树梅1 , 廖香俊3 , 曹启民4 . 超积累植物水蓼吸收锰的生理与分子机制[J]. Plant Diversity, 2008, 30(04): 489-495.

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Physiological and Molecular Mechanisms of Mn Uptake by Hyperaccumulting
Plant Polygonum hydropiper (Polygonaceae)

超积累植物水蓼吸收锰的生理与分子机制

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