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Adaptations and evolution of a heritable leaf nodule symbiosis between Dioscorea sansibarensis and Orrella dioscoreae

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Abstract
Various plant species establish intimate symbioses with bacteria within their aerial organs. The bacteria are contained within nodules or glands often present in distinctive patterns on the leaves in what is commonly referred to as leaf nodule symbiosis. We describe here a highly specific symbiosis between a wild yam species from Madagascar, Dioscorea sansibarensis and bacteria of the species Orrella dioscoreae. Using whole-genome sequencing of plastids and bacteria from wild-collected samples, we show phylogenetic patterns consistent with a dominant vertical mode of transmission of the symbionts. Unique so far among leaf nodule symbioses, the bacteria can be cultured and are amenable to comparative transcriptomics, revealing a potential role in complementing the host’s arsenal of secondary metabolites. We propose a recent establishment of a vertical mode of transmission in this symbiosis which, together with a large effective population size explains the cultivability and apparent lack of genome reductive evolution in O. dioscoreae. We leverage these unique features to reveal pathways and functions under positive selection in these specialized endophytes, highlighting the candidate mechanisms enabling a permanent association in the phyllosphere.
Keywords
Ecology, Evolution, Behavior and Systematics, Microbiology

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Citation

Please use this url to cite or link to this publication:

Chicago
De Meyer, Frédéric, Bram Danneels, Tessa Acar, Rado Rasolomampianina, Mamy Tiana Rajaonah, Vololoniaina Jeannoda, and Aurélien Carlier. 2019. “Adaptations and Evolution of a Heritable Leaf Nodule Symbiosis Between Dioscorea Sansibarensis and Orrella Dioscoreae.” The ISME Journal.
APA
De Meyer, F., Danneels, B., Acar, T., Rasolomampianina, R., Rajaonah, M. T., Jeannoda, V., & Carlier, A. (2019). Adaptations and evolution of a heritable leaf nodule symbiosis between Dioscorea sansibarensis and Orrella dioscoreae. The ISME Journal.
Vancouver
1.
De Meyer F, Danneels B, Acar T, Rasolomampianina R, Rajaonah MT, Jeannoda V, et al. Adaptations and evolution of a heritable leaf nodule symbiosis between Dioscorea sansibarensis and Orrella dioscoreae. The ISME Journal. Springer Nature; 2019;
MLA
De Meyer, Frédéric et al. “Adaptations and Evolution of a Heritable Leaf Nodule Symbiosis Between Dioscorea Sansibarensis and Orrella Dioscoreae.” The ISME Journal (2019): n. pag. Print.
@article{8608891,
  abstract     = {Various plant species establish intimate symbioses with bacteria within their aerial organs. The bacteria are contained within nodules or glands often present in distinctive patterns on the leaves in what is commonly referred to as leaf nodule symbiosis. We describe here a highly specific symbiosis between a wild yam species from Madagascar, Dioscorea sansibarensis and bacteria of the species Orrella dioscoreae. Using whole-genome sequencing of plastids and bacteria from wild-collected samples, we show phylogenetic patterns consistent with a dominant vertical mode of transmission of the symbionts. Unique so far among leaf nodule symbioses, the bacteria can be cultured and are amenable to comparative transcriptomics, revealing a potential role in complementing the host{\textquoteright}s arsenal of secondary metabolites. We propose a recent establishment of a vertical mode of transmission in this symbiosis which, together with a large effective population size explains the cultivability and apparent lack of genome reductive evolution in O. dioscoreae. We leverage these unique features to reveal pathways and functions under positive selection in these specialized endophytes, highlighting the candidate mechanisms enabling a permanent association in the phyllosphere.},
  author       = {De Meyer, Fr{\'e}d{\'e}ric and Danneels, Bram and Acar, Tessa and Rasolomampianina, Rado and Rajaonah, Mamy Tiana and Jeannoda, Vololoniaina and Carlier, Aur{\'e}lien},
  issn         = {1751-7362},
  journal      = {The ISME Journal},
  publisher    = {Springer Nature},
  title        = {Adaptations and evolution of a heritable leaf nodule symbiosis between Dioscorea sansibarensis and Orrella dioscoreae},
  url          = {http://dx.doi.org/10.1038/s41396-019-0398-8},
  year         = {2019},
}

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