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- Title
Eco-physiological responses of high-latitude transplanted Aegiceras corniculatum seedlings to NaCl stress.
- Authors
Zheng Chun-Fang; Ji De-Wei; Qiu Jian-Biao; Wu Jin-Gu; Chen Shao-Bo; Huang Xiao-Lin; Liu Wei-Cheng
- Abstract
A sand culture pot experiment was conducted to study the eco-physiological responses of high-latitude transplanted mangrove Aegiceras corniculatum seedlings to varying concentration of NaCl (0, 100, 200, 300, and 400 mmol·L-1 ). Under the stress of 100 mmol NaCl·L-1, the seedling growth was slightly promoted; whereas at 300 mmol NaCl·L-1, the plant height, stem basal diameter, fresh and dry mass, and root/ shoot ratio were decreased significantly. High salt stress inhibited the leaf superoxide dismutase (SOD) and peroxidase (POD) activities, increased the leaf malondialdehyde (MDA) content, and decreased the leaf chlorophyll and carotenoids contents as well as the total soluble sugar and free amino acid contents in different organs. Under the stress of different concentration NaCl, the Na+ contents in leaf, stem, and root increased rapidly while the K+ contents had a relatively decrease, resulting in a rapid decrease of K+ / Na+ ratio and an imbalance between K+ and Na+ in A. corniculatum vegetative organs. When the NaCl concentration in the medium was higher than 300 mmol·L-1, the C and N metabolism of A. corniculatum vegetative organs was maladjusted, which inhibited the normal growth of the seedlings, resulting in a significant decrease in the plant height and fresh and dry mass.
- Subjects
MANGROVE ecology; TRANSPLANTING (Plant culture); SEEDLINGS; EFFECT of stress on plants; PLANT ecophysiology; EFFECT of salts on plants; COMPOSITION of leaves; PHYTOGEOGRAPHY; LATITUDE
- Publication
Chinese Journal of Applied Ecology / Yingyong Shengtai Xuebao, 2011, Vol 22, Issue 9, p2279
- ISSN
1001-9332
- Publication type
Article