Table of Contents Author Guidelines Submit a Manuscript
The Scientific World Journal
Volume 2015 (2015), Article ID 354581, 9 pages
http://dx.doi.org/10.1155/2015/354581
Research Article

Physiological Responses of Kosteletzkya virginica to Coastal Wetland Soil

1Key Laboratory of Coastal Biology & Bioresources Utilization, Yantai Institute of Coastal Zone Research (YIC), Chinese Academy of Sciences (CAS), Yantai 264003, China
2Yantai Academy of China Agriculture University, Yantai 264670, China
3University of Chinese Academy of Sciences, Beijing 100049, China
4Institute of Biotechnology, Jiangsu Academy of Agricultural Sciences, Nanjing 210014, China

Received 16 August 2014; Accepted 16 September 2014

Academic Editor: Junhong Bai

Copyright © 2015 Hongyan Wang et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

Effects of salinity on growth and physiological indices of Kosteletzkya virginica seedlings were studied. Plant height, fresh weight (FW), dry weight (DW), and net photosynthetic rate () increased at 100 mM NaCl and slightly declined at 200 mM, but higher salinity induced a significant reduction. Chlorophyll content, stomatal conductance (), intercellular CO2 concentration (), and transpiration rate () were not affected under moderate salinities, while markedly decreased at severe salinities except for the increased at 400 mM NaCl. Furthermore, no significant differences of / and ΦPSII were found at lower than 200 mM NaCl, whereas higher salinity caused the declines of /, ΦPSII, and qP similar to , accompanied with higher NPQ. Besides, salt stress reduced the leaf RWC, but caused the accumulation of proline to alleviate osmotic pressure. The increased activities of antioxidant enzymes maintained the normal levels of MDA and relative membrane permeability. To sum up, Kosteletzkya virginica seedlings have good salt tolerance and this may be partly attributed to its osmotic regulation and antioxidant capacity which help to maintain water balance and normal ROS level to ensure the efficient photosynthesis. These results provided important implications for Kosteletzkya virginica acting as a promising multiuse species for reclaiming coastal soil.