新的分离物扩大了Prochlorococcus的生理多样性,并阐明了它的宏观进化
Jamie W Becker1, Shaul Pollak1, Jessie W Berta-Thompson1
1Department of Civil and Environmental Engineering, Massachusetts Institute of Technology, Cambridge, Massachusetts, USA.
mBio
|October 18, 2024
概括
新发现的适应低光的Prochlorococcus菌株揭示了独特的色素适应性,并挑战了这些丰富的海洋蓝藻菌的现有进化模型.
科学领域:
- 海洋微生物学 海洋微生物学
- 进化生物学是进化的生物学.
- 光合作用研究研究光合作用.
背景情况:
- 是地球上最丰富的光,其多样性分为高光 (HL) 和低光 (LL) 适应群体.
- 培养分离物对于将基因组潜力与生理过程联系起来,以及测试进化理论至关重要.
- 新型LL适应的Prochlorococcus菌株填补了进化上的空白,为大规模进化提供了洞察力.
研究的目的:
- 从生理学上描述来自北太平洋的四种新的Prochlorococcus菌株.
- 将生理学数据与基因组分析结合起来,探索光合作用天线的进化.
- 讨论观察到的适应的宏观进化影响.
主要方法:
- 隔离和生理学表征四种新的Prochlorococcus菌株.
- 基因组分析包括色素生物合成和结合等位基因的比较基因组学.
- 对色素载体蛋白 (Pcb) 拷贝数和多样性的分析.
主要成果:
- 分离物属于深度分支的LL类 (LLVII和LLVIII),没有先前培养的代表.
- 菌株MIT1223具有较低的叶绿素b含量,这对于适应LL的菌株来说是不典型的.
- 基因组显示水平获得的色素等位基因,有助于生理多样性.
- PCB蛋白在副本数和多样性方面沿着与失去粒子附着的分支扩展.
结论:
- 观测支持一个宏观进化模型,涉及利基结构和过渡到浮游生物的生活方式.
- 新特征的菌株为Prochlorococcus的光生理学演变提供了洞察力.
- 这些发现重新定义了适应LL的Prochlorococcus的特征,挑战了现有的范式.
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