Diazotroph-derived nitrogen release and transfer under varying light intensity: insights from co-culture studies

被引：0
作者：
Hu, Xiaohua [1 ,2 ]
Wen, Zuozhu [1 ,3 ]
Luo, Tingwei [1 ,3 ]
Hong, Haizheng [1 ,2 ]
机构：
[1] Xiamen Univ, State Key Lab Marine Environm Sci, Xiamen, Fujian, Peoples R China
[2] Xiamen Univ, Coll Environm & Ecol, Xiamen, Fujian, Peoples R China
[3] Xiamen Univ, Coll Ocean & Earth Sci, Xiamen, Fujian, Peoples R China
来源：
FRONTIERS IN MARINE SCIENCE | 2025年 / 12卷
基金：
中国国家自然科学基金;
关键词：
<italic>Trichodesmium</italic>; <italic>Crocosphaera</italic>; DDN release; DDN transfer; light; DISSOLVED ORGANIC NITROGEN; N-2; FIXATION; TRICHODESMIUM-ERYTHRAEUM; CROCOSPHAERA-WATSONII; LOW-NUTRIENT; RATES; PACIFIC; GROWTH; PROCHLOROCOCCUS; CYANOBACTERIUM;
D O I：
10.3389/fmars.2025.1485853
中图分类号：
X [环境科学、安全科学];
学科分类号：
08 ; 0830 ;
摘要：
Biological dinitrogen (N2) fixation is a major source of new N to surface seawater, sustaining ocean productivity. However, the fate of diazotroph-derived nitrogen (DDN), specifically its release and transfer, and the factors controlling these processes, remain poorly understood. Here, we established stable co-cultures of the major diazotrophs, filamentous Trichodesmium erythraeum IMS101 and unicellular Crocosphaera watsonii WH8501, with the pico-cyanobacterium Synechococcus sp. WH8102, to explore the intrinsic differences in DDN release and transfer between diazotroph strains. We found that T. erythraeum released similar amounts of DDN as C. watsonii, but had a significantly higher DDN transfer efficiency for supporting Synechococcus cell growth. These results implied a higher bioavailability of fixed N released by T. erythraeum than by C. watsonii. Additionally, we showed that elevated light levels significantly enhanced T. erythraeum DDN release and transfer. Our results provide new insights into the fate of N fixed by different diazotrophs and the environmental factors that control the process.
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页数：11
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