Photosynthetic capacity and pigment distribution of a siphonous green alga, Dichotomosiphon tuberosus

Seki, Soichiro; Kobayashi, Koichi; Fujii, Ritsuko

doi:https://doi.org/10.1007/s11120-025-01148-3

Photosynthetic capacity and pigment distribution of a siphonous green alga, Dichotomosiphon tuberosus

Seki, Soichiro; Kobayashi, Koichi; Fujii, Ritsuko

Photosynthesis Research, 2025, 163, 30

アクセス数:101件（2026-02-16 13:15 集計）

固定URL: https://hdl.handle.net/11094/101408

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タイトル	Photosynthetic capacity and pigment distribution of a siphonous green alga, Dichotomosiphon tuberosus
著者	著者名 Seki, Soichiro
	NRID 1000040587945 1000040587945 著者名 Kobayashi, Koichi
	NRID 1000080351740 1000080351740 著者名 Fujii, Ritsuko
キーワード等	Dichotomosiphon tuberosus
	Non-photochemical quenching
	Light-harvesting complex
	Siphonaxanthin
	Siphonein
	Siphonous green algae
内容	The version of record of this article, first published in Photosynthesis Research, is available online at Publisher’s website: https://doi.org/10.1007/s11120-025-01148-3.
抄録	Dichotomosiphon tuberosus is one of the Bryopsidales, a siphonous, unicellular multinucleate ulvophyte. Bryopsidales typically occur in the ocean and contain unique carbonyl carotenoids siphonaxanthin (Sx) and its ester siphonein (Sn) in their major light-harvesting pigment-protein complexes, allowing them to utilize the green light available in the deep ocean for photosynthesis. However, unlike other Bryopsidales, D. tuberosus occurs in fresh water and is reported to contain Sn but not Sx. D. tuberosus inhabits deep lakes around the world, but in Okinawa, Japan, it inhabits very shallow waterways. Here, we measured the photosynthetic capacity of D. tuberosus collected from Okinawa waterway and compared it with another intertidal Bryopsidale Codium fragile. D. tuberosus had higher photosynthetic electron transport capacity and stronger non-photochemical quenching than C. fragile, consistent with the brighter growth environments for D. tuberosus than C. fragile. We also measured the absorption spectra and the pigment compositions within the photosynthetic pigment-protein complexes from D. tuberosus. Green light absorption of each complex in D. tuberosus was weaker than that in C. fragile. In contrast, Chl b absorption in LHCII was stronger in D. tuberosus than in C. fragile, whereas the opposite was true in photosystems. This implies that a large proportion of the irradiated energy is absorbed by LHCII complex and quenched more efficiently. Our results indicate that the photosynthetic capacity of D. tuberosus is further optimized for higher light environments compared with C. fragile.
出版者	Springer
収録物名	Photosynthesis Research
巻(号)	163
ページ	30
刊行年月	2025-05-21
言語	英語
ハンドルURL	https://hdl.handle.net/11094/101408
PISSN	01668595
eISSN	15735079
関連情報 (isIdenticalTo)	DOI (出版社版) https://doi.org/10.1007/s11120-025-01148-3
アクセス権	open access
権利情報	This article is licensed under a Creative Commons Attribution 4.0 International License.
出版タイプ	Version of Record
カテゴリ	学術雑誌論文 Journal Article

資源タイプ	学術雑誌論文
ローカル資源タイプ	学術雑誌論文
DCMI資源タイプ	text
DCTERMS.bibliographicCitation	Photosynthesis Research. 2025, 163, p. 30
DC.title	Photosynthetic capacity and pigment distribution of a siphonous green alga, Dichotomosiphon tuberosus
DC.creator	Seki, Soichiro
	Kobayashi, Koichi
	Fujii, Ritsuko
DC.publisher	Springer
DC.language' scheme='DCTERMS.RFC1766	英語
DC.type' scheme='DCTERMS.DCMIType	text
DCTERMS.issued' scheme='DCTERMS.W3CDTF	2025-05-21
DC.identifier	https://doi.org/10.1007/s11120-025-01148-3
DC.subject	Dichotomosiphon tuberosus
	Non-photochemical quenching
	Light-harvesting complex
	Siphonaxanthin
	Siphonein
	Siphonous green algae
DC.description	The version of record of this article, first published in Photosynthesis Research, is available online at Publisher’s website: https://doi.org/10.1007/s11120-025-01148-3.
DCTERMS.abstract	Dichotomosiphon tuberosus is one of the Bryopsidales, a siphonous, unicellular multinucleate ulvophyte. Bryopsidales typically occur in the ocean and contain unique carbonyl carotenoids siphonaxanthin (Sx) and its ester siphonein (Sn) in their major light-harvesting pigment-protein complexes, allowing them to utilize the green light available in the deep ocean for photosynthesis. However, unlike other Bryopsidales, D. tuberosus occurs in fresh water and is reported to contain Sn but not Sx. D. tuberosus inhabits deep lakes around the world, but in Okinawa, Japan, it inhabits very shallow waterways. Here, we measured the photosynthetic capacity of D. tuberosus collected from Okinawa waterway and compared it with another intertidal Bryopsidale Codium fragile. D. tuberosus had higher photosynthetic electron transport capacity and stronger non-photochemical quenching than C. fragile, consistent with the brighter growth environments for D. tuberosus than C. fragile. We also measured the absorption spectra and the pigment compositions within the photosynthetic pigment-protein complexes from D. tuberosus. Green light absorption of each complex in D. tuberosus was weaker than that in C. fragile. In contrast, Chl b absorption in LHCII was stronger in D. tuberosus than in C. fragile, whereas the opposite was true in photosystems. This implies that a large proportion of the irradiated energy is absorbed by LHCII complex and quenched more efficiently. Our results indicate that the photosynthetic capacity of D. tuberosus is further optimized for higher light environments compared with C. fragile.
DC.rights	This article is licensed under a Creative Commons Attribution 4.0 International License.
DC.format	101408
citation_title	Photosynthetic capacity and pigment distribution of a siphonous green alga, Dichotomosiphon tuberosus
citation_author	Seki, Soichiro
	Kobayashi, Koichi
	Fujii, Ritsuko
citation_publisher	Springer
citation_language	英語
citation_date	2025-05-21
citation_journal_title	Photosynthesis Research
citation_volume	163
citation_firstpage	30
citation_doi	https://doi.org/10.1007/s11120-025-01148-3
citation_public_url	https://hdl.handle.net/11094/101408

Photosynthetic capacity and pigment distribution of a siphonous green alga, Dichotomosiphon tuberosus

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