Temporal variations in physiological responses of Kandelia obovata seedlings exposed to multiple heavy metals

被引：29

作者：

Cheng, Shanshan ^{[1
]}

Tam, Nora Fung Yee ^{[2
]}

Li, Ruili ^{[1
]}

Shen, Xiaoxue ^{[1
]}

Niu, Zhiyuan ^{[1
]}

Chai, Minwei ^{[1
]}

Qiu, Guo Yu ^{[1
]}

机构：

[1] Peking Univ, Shenzhen Grad Sch, Sch Environm & Energy, Shenzhen 518055, Guangdong, Peoples R China

[2] City Univ Hong Kong, Dept Biol & Chem, Kowloon Tong, Hong Kong, Peoples R China

来源：

MARINE POLLUTION BULLETIN | 2017年 / 124卷 / 02期

基金：

中国国家自然科学基金;

关键词：

K; obovata; Photosynthetic characteristics; MDA; Proline; Multiple heavy metals stress; FUTIAN MANGROVE FOREST; TRACE-METALS; SOUTH CHINA; PHOTOSYNTHETIC PIGMENTS; BRUGUIERA-GYMNORRHIZA; ANTIOXIDATIVE ENZYMES; SEDIMENT CORES; ROOT ANATOMY; WATER-STRESS; SHENZHEN BAY;

D O I：

10.1016/j.marpolbul.2017.03.060

中图分类号：

X [环境科学、安全科学];

学科分类号：

08 ; 0830 ;

摘要：

A study was conducted to quantify temporal variations in physiological responses of Kandelia obovata under multiple heavy metal stress. The results showed that plant growth was not significantly affected by multiple heavy metal stress during the 120-days experiment. At the start, levels of net photosynthetic rate (PO, stomatal conductance (G(s)) and transpiration rate (T-r) showed effects of "low-promotion, high-inhibition", but Pr, and G, reduced with increasing heavy metal stress at the end. Temporary lipid oxidation was shown by high levels of malondialdehyde (MDA) under high heavy metal stress at the start but was unaffected at the end of the experiment. MDA negatively correlated with biomass arid photosynthetic parameters and acted as a sensitive indicator. Proline also shared similar trend and indicated its temporary role in osmotic adjustment. Negative correlations between osmotic adjustment matter and photosynthetic parameters further confirmed the significant role of osmotic adjustment under heavy metal stress. (C) 2017 Published by Elsevier Ltd.

引用

页码：1089 / 1095

页数：7