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Assemblages of anoxygenic phototrophic bacteria in tank bromeliads exhibit a host‐specific signature
Journal of Ecology ( IF 5.5 ) Pub Date : 2021-03-26 , DOI: 10.1111/1365-2745.13657
Antoine Vergne 1 , Vincent Darbot 1 , Corinne Bardot 1 , François Enault 1 , Anne‐Hélène Le Jeune 1 , Jean‐François Carrias 1 , Bruno Corbara 1 , Régis Céréghino 2 , Céline Leroy 3, 4 , Christian Jeanthon 5 , Eric Giraud 6 , Isabelle Mary 1 , Anne‐Catherine Lehours 1
Affiliation  

  1. Anoxygenic phototrophic bacteria (APB) are a very significant metabolic functional group in the phytotelmata of tank‐forming Bromeliaceae plants. Considering the close relationships existing between the bromeliad and its tank microbiota, the dominance of APB raises the question of their role in the ecology and evolution of these plants.
  2. Here, using pufM gene sequencing for taxonomic profiling, we investigated the structure of APB communities in the tanks of five bromeliad species exhibiting different habitat characteristics (i.e. physicochemical factors associated with the host), and occurring in different localities of French Guiana.
  3. We found that APB assemblages were specific to plant species and were less dependent on location or on bromeliad habitat characteristics. This convergence suggests that the identity of the bromeliad species per se is more important than habitat filtering or dispersal to control specific assembly rules for APB.
  4. The pufM OTUs were affiliated with five orders of Alpha‐ and Betaproteobacteria (Rhodobacterales, Sphingomonadales, Rhizobiales, Burkholderiales and Rhodospirillales), and we assume that they may be major components of the core microbiota of plant‐held waters.
  5. Our findings also revealed that up to 79% of the sequences were affiliated with APB clades possessing nitrogen‐fixing genes suggesting that this metabolic capability is widespread within the APB community inhabiting tank bromeliads. We hypothesized that bromeliads may benefit nutritionally from associations with free‐living APB capable to fix atmospheric nitrogen.
  6. Synthesis. Understanding the dominance of APB in tank bromeliads and determining whether a potential interplay exists between these partners is an intriguing aspect of possible mutualistic and coevolving interactions between the two existing forms of chlorophototrophy (i.e. bacteriochlorophyll‐based anoxygenic and chlorophyll‐based oxygenic phototrophy). In the present study, we found that bromeliad species was the main factor that explained variance in APB community composition. These findings suggest that APB and tank bromeliads may have a close, mutualistic relationship and we hypothesize according to our genomic analyses that APB may promote the bromeliad growth by provisioning essential nutrients like nitrogen.


中文翻译:

罐装凤梨科植物中产氧性光养细菌的组合表现出宿主特有的特征

  1. 产氧光养细菌(APB)在形成罐状凤梨科植物的植物触媒中是一个非常重要的代谢功能基团。考虑到凤梨科植物与其罐内菌群之间存在着密切的关系,APB的优势提出了它们在这些植物的生态和进化中的作用的问题。
  2. 在这里,我们使用pufM基因测序进行分类学分析,我们研究了五个凤梨种类的罐中APB群落的结构,这些凤梨种类表现出不同的栖息地特征(即与宿主相关的理化因子),并且发生在法属圭亚那的不同地区。
  3. 我们发现,APB组合是特定于植物物种的,并且对位置或凤梨栖息地特征的依赖性较小。这种趋同表明,凤梨科物种本身的身份比栖息地过滤或散布更重要,以控制APB的特定装配规则。
  4. pufM的OTU用五个订单附属阿尔法-和贝塔-变形菌RhodobacteralesSphingomonadales根瘤菌目伯克氏菌目红螺菌目),我们认为他们可能是植物水域举行的核微生物的主要组成部分。
  5. 我们的发现还揭示,高达79%的序列与拥有固氮基因的APB进化枝相关,这表明这种代谢能力在居住于罐装凤梨科动物的APB群落中广泛分布。我们假设凤梨可以与能够固定大气氮素的自由活动的APB结合而从营养上受益。
  6. 综合。了解罐装凤梨科植物中APB的优势并确定这些伙伴之间是否存在潜在的相互作用是两个现有形式的氯光养素(即基于细菌叶绿素的生氧性和基于叶绿素的含氧性光养分)之间可能存在的相互影响和共同发展的相互作用的一个有趣方面。在本研究中,我们发现凤梨科物种是解释APB群落组成差异的主要因素。这些发现表明,APB和罐装凤梨科植物可能具有密切的相互关系,根据我们的基因组分析,我们假设APB可以通过提供必需的营养素(如氮)来促进凤梨科植物的生长。
更新日期:2021-04-21
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