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The Scientific World Journal
Volume 2013 (2013), Article ID 289537, 11 pages
http://dx.doi.org/10.1155/2013/289537
Research Article

Physiological and Biochemical Responses of Ulva prolifera and Ulva linza to Cadmium Stress

1College of Natural Resources and Environmental Science, Key Laboratory of Marine Biology, Nanjing Agricultural University, Nanjing, Jiangsu 210095, China
2Zhejiang Mariculture Research Institute, Zhejiang Key Laboratory of Exploitation and Preservation of Coastal Bio-Resource, Wenzhou, Zhejiang 325005, China
3College of Oceanography, Huaihai Institute of Technology, Lianyungang, Jiangsu 222005, China

Received 2 January 2013; Accepted 3 February 2013

Academic Editors: J. Huang and Z. Wang

Copyright © 2013 He-ping Jiang 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

Responses of Ulva prolifera and Ulva linza to Cd2+ stress were studied. We found that the relative growth rate (RGR), Fv/Fm, and actual photochemical efficiency of PSII (Yield) of two Ulvaspecies were decreased under Cd2+ treatments, and these reductions were greater in U. prolifera than in U. linza. U. prolifera accumulated more cadmium than U. linza under Cd2+ stress. While U. linza showed positive osmotic adjustment ability (OAA) at a wider Cd2+ range than U. prolifera. U. linza had greater contents of N, P, Na+, K+, and amino acids than U. prolifera. A range of parameters (concentrations of cadmium, Ca2+, N, P, K+, Cl, free amino acids (FAAs), proline, organic acids and soluble protein, Fv/Fm, Yield, OAA, and K+/Na+) could be used to evaluate cadmium resistance in Ulva by correlation analysis. In accordance with the order of the absolute values of correlation coefficient, contents of Cd2+ and K+, Yield, proline content, Fv/Fm, FAA content, and OAA value of Ulva were more highly related to their adaptation to Cd2+ than the other eight indices. Thus, U. linza has a better adaptation to Cd2+ than U. prolifera, which was due mainly to higher nutrient content and stronger OAA and photosynthesis in U. linza.