在铁含量有限的海洋地区,Synechococcus基因丧失
Garrett Sharpe1, Liang Zhao2, Meredith G Meyer2
1Environment Ecology and Energy Program, University of North Carolina at Chapel Hill, Chapel Hill, NC, USA.
ISME communications
|October 2, 2023
概括
高度Synechococcus,重要的海洋微生物,已经失去了酸盐同化基因. 这种适应高营养低 (HNLC) 地区的铁限制影响全球碳和循环.
科学领域:
- 海洋微生物学 海洋微生物学
- 海洋学 海洋学 海洋学
- 生物地质化学生物地质化学
背景情况:
- 赛内可可可 (Synechococcus) 是在高度地区丰富的蓝藻细菌,对海洋初级生产至关重要.
- 对于高度Synechococcus存在有限的基因组数据,这阻碍了对铁限制适应性的理解.
- 由于缺铁,高营养低 (HNLC) 区域给海洋生物带来了独特的挑战.
研究的目的:
- 为了研究Synechococcus适应铁限制在亚北极北太平洋,一个关键的HNLC地区.
- 在高度海洋环境中描述Synechococcus种群及其遗传构成.
- 评估这些适应对营养循环和初级生产力的影响.
主要方法:
- 使用短读和长读的定量元基因组学来组装Synechococcus基因组.
- 将元基因组衍生的丰度与流细胞计数的比较.
- 对Synechococcus MAGs进行营养同化基因的生物信息分析,并与TARA海洋数据集进行比较.
主要成果:
- 两个几乎完整的Synechococcus转基因组组装基因组 (MAGs) 从亚北极北太平洋地区生成.
- 赛内可可菌 (Synechococcus MAGs) 呈现出很高的丰度,占P站99%以上的人口.
- MAGs 具有铁限制适应基因,但缺乏酸盐和酸盐同化基因,表明它们依赖循环.
结论:
- 在高度HNLC地区的Synechococcus可能已经失去了酸盐/酸盐同化基因,以适应严重的铁限制.
- 这种遗传损失表明人们依赖和尿素等替代源,从而减少铁的需求.
- 调查结果影响了蓝藻细菌对海洋初级生产和碳出口的贡献模型.
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