Zinc conferred cadmium tolerance in Lemna minor L. via modulating polyamines and proline metabolism

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• 作者：Xuqiang Qiao ; Penghe Wang ; Guoxin Shi ; Haiyan Yang
• 关键词：Zn ; Cd ; Polyamines ; Proline ; Lemna minor L.
• 刊名：Plant Growth Regulation
• 出版年：2015
• 出版时间：September 2015
• 年：2015
• 卷：77
• 期：1
• 页码：1-9
• 全文大小：959 KB
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• 作者单位：Xuqiang Qiao (1)
  Penghe Wang (2)
  Guoxin Shi (3)
  Haiyan Yang (4)
  
  1. College of Biology and the Environment, Nanjing Forestry University, Nanjing, 210037, Jiangsu, People’s Republic of China
  2. Institute of Wetland Ecology, School of Life Science, Nanjing University, Nanjing, 210093, Jiangsu, People’s Republic of China
  3. College of Life Science, Nanjing Normal University, Nanjing, 210046, Jiangsu, People’s Republic of China
  4. Institute of Botany, Jiangsu Province and the Chinese Academy of Sciences, Nanjing, 210046, Jiangsu, People’s Republic of China
  
• 刊物类别：Biomedical and Life Sciences
• 刊物主题：Life Sciences
  Plant Physiology
  
• 出版者：Springer Netherlands
• ISSN：1573-5087

文摘

To investigate the alleviating effects of zinc (Zn) against gradually increasing cadmium (Cd) stress in aquatic environment, dry weight, polyamines and proline contents as well as metabolic enzymes were studied in Lemna minor L. after 4?days exposure. Dry weight was significantly decreased as the concentration of Cd increased. Cd stress also increased the putrescine (Put) content, while decreasing spermidine (Spd) content, whereas no significant change was observed in spermine (Spm) content. Hence, the ratio of (Spd?+?Spm)/Put rapidly reduced. In addition, the activities of arginine decarboxylase (ADC), ornithine decarboxylase and polyamine oxidase (PAO) enhanced accordingly. Cd treatment also induced a continuous accumulation of proline. Meanwhile, pyroline-5-carboxylate synthetase (P5CS) activity increased initially only to decline later and ornithine δ-aminotransferase (OAT) activity was only significantly stimulated at 4?μM Cd, while the proline dehydrogenase (PDH) activity declined. However, Zn supplementation lowered accumulation of Put and proline contents and raised the Spd content, via decreasing the activities the ADC and PAO and keeping the activities of P5CS, OAT and PDH at the control levels, but failed to generate a statistically significant difference in content of dry weight. These results suggested that Zn application can maintain polyamines and proline homeostasis, thus conferring the tolerance of L. minor to Cd.