酸盐的利用由全球重要的海洋透生物Trichodesmium进行
S T Dyhrman1, P D Chappell, S T Haley
1Biology Department, Woods Hole Oceanographic Institution, Woods Hole, Massachusetts 02543, USA.
Nature
|January 7, 2006
概括
海洋蓝藻细菌Trichodesmium可以利用有机化合物,特别是酸盐,当酸盐稀缺时. 这种独特的适应有助于解释它们在缺乏营养的海洋地区的流行.
科学领域:
- 海洋微生物学 海洋微生物学
- 生物地质化学循环 生物地质化学循环
- 分子生物学分子生物学
背景情况:
- 像Trichodesmium这样的海洋透生物对全球碳和循环至关重要.
- 海洋旋转通常经历低酸盐度,限制植物浮游生物的生长.
- 溶解的有机代表着一个庞大的,未充分利用的营养池.
研究的目的:
- 为了研究Trichodesmium erythraeum对压力的生理反应.
- 为了确定参与有机化合物的吸收和利用的基因.
- 了解三虫适应于寡质海洋环境的情况.
主要方法:
- 对Trichodesmium erythraeum IMS101.1. 的基因组分析
- 在压力下诱导与酸盐代谢相关的基因.
- 在萨尔加索海T. erythraeum种群中的基因表达分析.
主要成果:
- 应激会诱导基因通过碳酶路径进行高 afinity 酸盐运输和水解.
- 这些基因在萨尔加索海的T. erythraeum中被积极表达.
- 在海洋蓝藻细菌中,Trichodesmium具有独特的能力,可以从有机来源中清理.
结论:
- 三氏体可以利用酸盐,这是以前未知的的来源在寡度海洋.
- 碳溶解途径为Trichodesmium在低酸盐环境中提供了竞争优势.
- 这种适应性可能解释了Trichodesmium在营养有限的海洋生态系统中的成功.
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