Acclimation of the intertidal red alga Bangiopsis subsimplex (Stylonematophyceae) to salinity changes

被引:35
作者
Eggert, A.
Nitschke, U.
West, J. A.
Michalik, D.
Karsten, U.
机构
[1] Univ Rostock, Inst Biol Sci, D-18051 Rostock, Germany
[2] Univ Rostock, Leibniz Inst Organ Catalysis, D-18055 Rostock, Germany
[3] Univ Melbourne, Dept Bot, Parkville, Vic 3052, Australia
基金
澳大利亚研究理事会;
关键词
compatible solutes; F-v/F-m (maximum photosystern II efficiency); growth; NPQ (non-photochemical quenching); osmotic acclimation; photosynthesis; salinity stress; sorbitol;
D O I
10.1016/j.jembe.2006.11.015
中图分类号
Q14 [生态学(生物生态学)];
学科分类号
071012 ; 0713 ;
摘要
The effect of salinity on growth, photosynthetic performance and osmotic acclimation was investigated in the eulittoral red algal species Bangiopsis subsimplex (Stylonematophyceae). The strain grew in a broad salinity range between 1 and 70 psu showing optimum growth between 10 and 50 psu. The saturation point I-k of the photosynthesis irradiance curves ranged between 153 and 83 mu mol photons m(-2) s(-1) at all salinities and indicates an adaptation of B. subsimplex to moderate radiation conditions. Adjustments on the photosynthetic level (non-photochemical quenching) were sufficient to prevent damage to the photosynthetic apparatus as F-v/F-m values were constantly high (> 0.7) even when grown at the most hypo- and hypersaline conditions. As main low molecular weight carbohydrates, B. subsimplex contains the heteroside digeneaside and the polyol sorbitol. Digeneaside concentration was low and almost unchanged after hypersaline treatment (< 20 mu mol g(-1) DW), i.e. it did not play a role in osmotic acclimation. By contrast, sorbitol levels increased linearly from 150 to 380 mu mol g(-1) DW with increasing salinities between 5 and 60 psu, indicating its important function as an osmolyte and compatible solute under hypersaline conditions. The data presented are consistent with the natural habitat of B. subsimplex, i.e. the upper eulittoral zone. (c) 2007 Elsevier B.V. All rights reserved.
引用
收藏
页码:176 / 186
页数:11
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