http://scholars.ntou.edu.tw/handle/123456789/23828
Title: | Elevated temperature relieves phosphorus limitation of marine unicellular diazotrophic cyanobacteria | Authors: | Deng, Lixia Cheung, Shunyan Kang, Chang‐Keun Liu, Kailin Xia, Xiaomin Liu, Hongbin |
Keywords: | CROCOSPHAERA-WATSONII;NORTH PACIFIC;N-2 FIXATION;NITROGEN-FIXATION;MOLECULAR ASSESSMENT;COMMUNITY STRUCTURE;GENE-EXPRESSION;TRICHODESMIUM;PHYTOPLANKTON;IRON | Issue Date: | Jan-2021 | Publisher: | WILEY | Journal Volume: | 67 | Journal Issue: | 1 | Start page/Pages: | 122-134 | Source: | Limnology and Oceanography | Abstract: | The warming ocean is expected to be more phosphorus (P) limited due to increasing stratification. P is a major limiting nutrient of marine diazotrophs, while the interactive effect of temperature elevation and P limitation on marine unicellular diazotrophs is unknown. Here, we examined the physiology of a major unicellular diazotroph, Crocosphaera watsonii, grown under P-limited and P-replete conditions at 25 degrees C, 28 degrees C, and 31 degrees C. Growth, N-2, and CO2 fixation rates of C. watsonii increased with temperature under P limitation, and growth rates were similar between P-limited and P-replete treatments at 31 degrees C. At high temperature, the P use efficiencies for N-2 and CO2 fixation under P limitation were more than twice higher than under P-replete conditions. Expression of genes involved in P acquisition, intracellular recycling, and substitution in C. watsonii was upregulated at higher temperature under P limitation. These results suggest that P limitation in C. watsonii was relieved with elevated temperature through various temperature-dependent economic strategies on P metabolism. Through meta-analysis of a field data set using general additive model, we found that C. watsonii abundance was correlated mainly with temperature and phosphate, and predicted to increase significantly with further warming. |
URI: | http://scholars.ntou.edu.tw/handle/123456789/23828 | ISSN: | 0024-3590 1939-5590 |
DOI: | 10.1002/lno.11980 |
Appears in Collections: | 海洋生物研究所 |
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