TY - JOUR
T1 - Temporal variations in physiological responses of Kandelia obovata seedlings exposed to multiple heavy metals
AU - Cheng, Shanshan
AU - Tam, Nora Fung Yee
AU - Li, Ruili
AU - Shen, Xiaoxue
AU - Niu, Zhiyuan
AU - Chai, Minwei
AU - Qiu, Guo Yu
N1 - Publisher Copyright:
© 2017
PY - 2017/11/30
Y1 - 2017/11/30
N2 - 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 (Pn), stomatal conductance (Gs) and transpiration rate (Tr) showed effects of “low-promotion, high-inhibition”, but Pn and Gs 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 and 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.
AB - 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 (Pn), stomatal conductance (Gs) and transpiration rate (Tr) showed effects of “low-promotion, high-inhibition”, but Pn and Gs 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 and 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.
KW - K. obovata
KW - MDA
KW - Multiple heavy metals stress
KW - Photosynthetic characteristics
KW - Proline
UR - http://www.scopus.com/inward/record.url?scp=85018741433&partnerID=8YFLogxK
U2 - 10.1016/j.marpolbul.2017.03.060
DO - 10.1016/j.marpolbul.2017.03.060
M3 - Article
C2 - 28442201
AN - SCOPUS:85018741433
SN - 0025-326X
VL - 124
SP - 1089
EP - 1095
JO - Marine Pollution Bulletin
JF - Marine Pollution Bulletin
IS - 2
ER -