Metabolic responses to food and temperature in deep-sea isopods, Bathynomus doederleini

Tanaka, Shogo; Ono, Yurika; Tanimae, Shin-ichiro; Moriyama, Toru; Fujimoto, Shingo; Yagi, Mitsuharu

doi:10.1016/j.dsr.2023.104019

Deep Sea Research Part I: Oceanographic Research Papers

2023

DOI: 10.1016/j.dsr.2023.104019

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Metabolic responses to food and temperature in deep-sea isopods, Bathynomus doederleini

Shogo Tanaka

Yurika Ono

Shin-ichiro Tanimae

et al.

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2024

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Cited by 2 publications

References 27 publications

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Chromosome‐level genome assembly of a deep‐sea Venus flytrap sea anemone sheds light upon adaptations to an extremely oligotrophic environment

Li,

Zhan,

et al. 2024

Molecular Ecology

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The Venus flytrap sea anemone Actinoscyphia liui inhabits the nutrient‐limited deep ocean in the tropical western Pacific. Compared with most other sea anemones, it has undergone a distinct modification of body shape similar to that of the botanic flytrap. However, the molecular mechanism by which such a peculiar sea anemone adapts to a deep‐sea oligotrophic environment is unknown. Here, we report the chromosomal‐level genome of A. liui constructed from PacBio and Hi‐C data. The assembled genome is 522 Mb in size and exhibits a continuous scaffold N50 of 58.4 Mb. Different from most other sea anemones, which typically possess 14–18 chromosomes per haplotype, A. liui has only 11. The reduced number of chromosomes is associated with chromosome fusion, which likely represents an adaptive strategy to economize energy in oligotrophic deep‐sea environments. Comparative analysis with other deep‐sea sea anemones revealed adaptive evolution in genes related to cellular autophagy (TMBIM6, SESN1, SCOCB and RPTOR) and mitochondrial energy metabolism (MDH1B and KAD2), which may aid in A. liui coping with severe food scarcity. Meanwhile, the genome has undergone at least two rounds of expansion in gene families associated with fast synaptic transmission, facilitating rapid responses to water currents and prey. Positive selection was detected on putative phosphorylation sites of muscle contraction‐related proteins, possibly further improving feeding efficiency. Overall, the present study provides insights into the molecular adaptation to deep‐sea oligotrophic environments and sheds light upon potential effects of a novel morphology on the evolution of Cnidaria.

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Chromosome‐level genome assembly of a deep‐sea Venus flytrap sea anemone sheds light upon adaptations to an extremely oligotrophic environment

Li,

Zhan,

et al. 2024

Molecular Ecology

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地上部･地下部呼吸の芽生え～成木での変化

KUROSAWA,

MORI

2024

Root Research

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Growth and adaptation of long-lived trees are supported by energy produced by whole-plant respiration. The energy is allocated to root and shoot for water and carbon acquisition, and the allocation changes during ontogeny according to body size. However, few empirical studies have investigated the respiration of root and shoot throughout ontogeny. We measured the respiration, fresh mass, and surface area of entire roots and shoots for 377 beech (Fagus crenata) trees, from germinating seeds to mature trees. On log-log coordinates, the root and shoot respiration rates versus whole-plant fresh mass were modeled by upward and downward convex trends, respectively. This was because root fraction in respiration increased during early growth stages and decreased in later stages. However, during early growth stage, increase of root fraction was more largely in surface area (max. 78.2%) than in respiration (max. 47.8%). These indicate that a rapid and low-cost increase of root surface area during early growth stage promotes shoot growth at later stages. In mature stage, declines of root growth toward an asymptote was followed by declines of shoot and whole-plant growth. Furthermore, the whole-plant respiration of beech were within the range of whole-plant respiration of seedlings to large trees of 51 species from Russia to Indonesia. This indicates that there is a general pattern in the scaling of whole-plant respiration that transcends phylogeny and environment. Here, we review the whole-plant level root-shoot relationships and explain the significance of wholeplant respiration, including roots, for understanding underlying mechanisms of tree growth.

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Metabolic responses to food and temperature in deep-sea isopods, Bathynomus doederleini

Cited by 2 publications

References 27 publications

Chromosome‐level genome assembly of a deep‐sea Venus flytrap sea anemone sheds light upon adaptations to an extremely oligotrophic environment

Chromosome‐level genome assembly of a deep‐sea Venus flytrap sea anemone sheds light upon adaptations to an extremely oligotrophic environment

地上部･地下部呼吸の芽生え～成木での変化

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