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生态学杂志 ›› 2011, Vol. 30 ›› Issue (10): 2155-2164.

• 研究报告 • 上一篇    下一篇

外源水杨酸对镉胁迫下两种菊芋品系幼苗的缓解作用

陈良1,隆小华1,晋利2,金善钊1,郑晓涛1,刘兆普1**   

  1. 1南京农业大学资源与环境科学学院, 江苏省海洋生物学重点实验室, 南京 210095;2中国环境管理干部学院环境工程系, 河北秦皇岛 066004
  • 出版日期:2011-10-08 发布日期:2011-10-08

Mitigation effects of exogenous salicylic acid on the seedling growth of two Helianthus tuberosus varieties under Cd stress.

CHEN Liang1, LONG Xiao-hua1, JIN Li2, JIN Shan-zhao1, ZHENG Xiao-tao1, LIU Zhao-pu1**   

  1. 1Key Laboratory of Marine Biology of Jiangsu Province, College of Resources and Environmental Sciences, Nanjing Agricultural University, Nanjing 210095, China;2Enviroment Engineering Department, Enuironment Management College of China, Qinhuangdao 066004, Hebei, China
  • Online:2011-10-08 Published:2011-10-08

摘要: 研究了不同浓度Cd(0、50、100 μmol·L-1)及水杨酸(SA)(0、10、100和1000 μmol·L-1)处理下2种菊芋(南芋5号和南芋2号)的生物量变化情况,测定了叶片色素(叶绿素和类胡萝卜素)含量及光合作用参数,并比较了2种菊芋对Cd的吸收转运差异性。结果表明:外源SA处理不同程度地缓解了Cd对菊芋幼苗生长的毒害效应,提高了色素含量,改善了光合作用参数,增大了Cd的生物富集系数(BCF)和转运系数(TF),与此同时减少了植株不同器官对Cd的累积量,但最佳SA浓度因品种及器官不同而有所区别。研究表明,适当浓度的SA处理可以有效增强2种菊芋对Cd的耐性。

关键词: 环境因子, 有机碳分解, 农业土壤, 培养实验, 气候变化

Abstract: The cadmium (Cd) in soil environment has a high toxicity, which not only harms plant growth and development, but also threatens human health. Salicylic acid (SA), a plant growth regulator, can play an important role in inducing plant Cd-resistance. This paper studied the mitigation effects of different concentration (0, 10, 100, and 1000 μmol·L-1) SA on the Cd toxicity to two H. tuberosus varieties (NY5 and NY2) under various Cd stress (0, 50, and 100 μmol·L-1). The results showed that exogenous SA could mitigate the Cd toxicity to NY5 and NY2. The SA increased the pigment content, improved the photosynthetic parameters, enhanced the bioconcentration factor (BCF) and translocation factor (TF), and reduced the Cd accumulation in plant organs, but the optimal concentration of SA differed with the varieties and their organs. It was suggested that applying appropriate concentration of CA could effectively enhance the Cd-resistance of the two H.tuberosus varieties.

Key words: Environmental factors, Organic carbon decomposition, Agricultural soils, Incubation experiment, Climate change