›› 2014, Vol. 22 ›› Issue (1): 116-121.DOI: 10.11733/j.issn.1007-0435.2014.01.018

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Effects of Cu2+and Zn2+ Stress on the Bulbil Germination and Physiological-biochemical Characteristics of Polygonum viviparum

ZHAO Yu-hong, MENG Zu-qing, NIU Xin-yu, JING Jiu-wang, WEI Xue-hong   

  1. Agriculture and Animal Husbandry College, Tibet University, Linzhi, Tibet 860000, China
  • Received:2013-05-22 Revised:2013-07-02 Online:2014-02-15 Published:2014-01-28

铜、锌胁迫对珠芽蓼珠芽萌发及生理生化特性的影响

赵玉红, 蒙祖庆, 牛歆雨, 敬久旺, 魏学红   

  1. 西藏大学农牧学院, 西藏 林芝 860000
  • 通讯作者: 敬久旺,E-mail:jjw-ok@163.com
  • 作者简介:赵玉红(1979-),男,甘肃武威人,副教授,硕士,主要从事草地生态学的研究与教学,E-mail:yuhong19801011@126.com
  • 基金资助:
    国家自然基金(31160112)(31240019);教育部青年基金(10XZJC850002)资助

Abstract: In order to understand the remediation mechanism of copper-zinc mine soil by Polygonum viviparum, the effects of Cu and Zn stress on the bulbil germination rate, seedling growth and physiological-biochemical characteristics of Polygonum viviparum were investigated in this study. Results showed that the germination rate of bulbil decreased when Cu2+ concentration was more than 40 mg·L-1 or Zn2+ more than 20 mg·L-1. The seedling height and root length of Polygonum viviparum were correlated with the concentrations of Cu+2 and Zn2+. Cu2+ had more significant effects on the seedling growth and root elongation of bulbil compared to Zn2+. The chlorophyll a and chlorophyll b contents of bulbils decreased with the increase of Cu2+ or Zn2+ concentration; whereas the conductivity and malonaldehyde (MDA) contents of leaves increased. And all tested indexes were correlated with the concentrations of Cu2+ and Zn2+.

Key words: Cu stress, Zn stress, Polygonum viviparum L., Bulbil germination, Physiological-biochemical characteristics

摘要: 为了探索珠芽蓼(Polygonum viviparum L.)修复铜、锌矿山土壤的机制,以珠芽蓼珠芽为材料,采用溶液培养试验研究了不同浓度的铜(Cu2+)和锌(Zn2+)胁迫对珠芽蓼珠芽萌发、生长及生理生化特性的影响。结果表明:Cu2+浓度达到40 mg·L-1时,发芽率下降;Zn2+浓度达到20 mg·L-1时,发芽率下降。不同浓度Cu2+和Zn2+与珠芽蓼幼苗高度和根长相关,Cu2+对珠芽蓼珠芽幼苗生长和根系伸长的抑制作用比Zn2+更显著。随着Cu2+和Zn2处理浓度的升高,珠芽蓼叶绿素a、叶绿素b含量降低;叶片电导率和丙二醛(MDA)含量增大,并与处理浓度呈一定的相关关系。珠芽蓼虽能够在西藏中部矿区正常生长而具有一定的耐性,但在铜、锌污染土壤的植物修复中没有较强的应用潜力。

关键词: 铜胁迫, 锌胁迫, 蓼珠芽, 珠芽萌发, 生理生化特性

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