Underwater CAM photosynthesis elucidated by Isoetes genome

David Wickell, Li-Yaung Kuo, Hsiao-Pei Yang, Amra Dhabalia Ashok, Iker Irisarri, Armin Dadras, Sophie de Vries, Jan de Vries, Yao-Moan Huang, Zheng Li, Michael S. Barker, Nolan T. Hartwick, Todd P. Michael () and Fay-Wei Li ()
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David Wickell: Cornell University
Li-Yaung Kuo: National Tsing Hua University
Hsiao-Pei Yang: Boyce Thompson Institute
Amra Dhabalia Ashok: University of Goettingen
Iker Irisarri: University of Goettingen
Armin Dadras: University of Goettingen
Sophie de Vries: University of Goettingen
Jan de Vries: University of Goettingen
Yao-Moan Huang: Taiwan Forestry Research Institute
Zheng Li: University of Texas at Austin
Michael S. Barker: University of Arizona
Nolan T. Hartwick: The Salk Institute for Biological Studies
Todd P. Michael: The Salk Institute for Biological Studies
Fay-Wei Li: Cornell University

Nature Communications, 2021, vol. 12, issue 1, 1-13

Abstract: Abstract To conserve water in arid environments, numerous plant lineages have independently evolved Crassulacean Acid Metabolism (CAM). Interestingly, Isoetes, an aquatic lycophyte, can also perform CAM as an adaptation to low CO2 availability underwater. However, little is known about the evolution of CAM in aquatic plants and the lack of genomic data has hindered comparison between aquatic and terrestrial CAM. Here, we investigate underwater CAM in Isoetes taiwanensis by generating a high-quality genome assembly and RNA-seq time course. Despite broad similarities between CAM in Isoetes and terrestrial angiosperms, we identify several key differences. Notably, Isoetes may have recruited the lesser-known ‘bacterial-type’ PEPC, along with the ‘plant-type’ exclusively used in other CAM and C4 plants for carboxylation of PEP. Furthermore, we find that circadian control of key CAM pathway genes has diverged considerably in Isoetes relative to flowering plants. This suggests the existence of more evolutionary paths to CAM than previously recognized.

Date: 2021
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Persistent link: https://EconPapers.repec.org/RePEc:nat:natcom:v:12:y:2021:i:1:d:10.1038_s41467-021-26644-7

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DOI: 10.1038/s41467-021-26644-7

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