Freezing tolerance of Porphyra yezoensis (Bangiales, Rhodophyta) gametophyte assessed by chlorophyll fluorescence

文献类型： 外文期刊

第一作者： Zhu, Jian-Yi

作者： Zhu, Jian-Yi;Yao, Chun-Yan;Xu, Pu;Wang, Wen-Jun;Wang, Fei-Jiu;Sun, Xiu-Tao

作者机构：

关键词： Chlorophyll fluorescence;Dehydration;Freezing tolerance;Gametophyte;Porphyra yezoensis

期刊名称：JOURNAL OF APPLIED PHYCOLOGY （ 影响因子：3.215； 五年影响因子：3.612 ）

ISSN： 0921-8971

年卷期： 2011 年 23 卷 6 期

页码：

收录情况： SCI

摘要： In January and February 2010, heavy sea ice formed along the coast of the Bohai Sea and the northern Yellow Sea, China. Intertidal organisms were subjected to serious freezing stress. In this study, we investigated the freezing tolerance of the upper intertidal economic seaweed Porphyra yezoensis. The maximum photochemical efficiency of PS II (F (v)/F (m)) in undehydrated thalli remained high after 24 h at -2A degrees C and that in dehydrated thalli decreased in a proportion to thallial water loss. F (v)/F (m) dropped sharply after 24 h at -20A degrees C, regardless of absolute cellular water content (AWC). The F (v)/F (m) in frozen thalli recovered rapidly at 0-20A degrees C. A wide range of water loss in the thalli enhanced their tolerance to freezing. F (v)/F (m) values in undehydrated thalli dropped sharply after 3 d at -2A degrees C or 10 d at -20A degrees C while those in dehydrated thalli (20-53% AWCs) remained at high levels after 9 d at -2A degrees C or 30 d at -20A degrees C. These results indicate that P. yezoensis has high freezing tolerance by means of dehydration during the ebb tide and rapid recovery of F (v)/F (m) from freezing. A strategy of P. yezoensis industry to avoid heavy loss during freezing season is discussed based on these findings.

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