Anthocyanins act as a sugar-buffer and an alternative electron sink in response to starch depletion during leaf senescence: a case study on a typical anthocyanic tree species, Acer japonicum

Kitao, Mitsutoshi; Yazaki, Kenichi; Tobita, Hiroyuki; Agathokleous, Evgenios; Kishimoto, Junko; Takabayashi, Atsushi; Tanaka, Ryouichi

Anthocyanins act as a sugar-buffer and an alternative electron sink in response to starch depletion during leaf senescence: a case study on a typical anthocyanic tree species, Acer japonicum

Kitao, Mitsutoshi; Yazaki, Kenichi; Tobita, Hiroyuki et al.

Journal of Experimental Botany, 2024, 75(11), 3521-3541

Permalink : https://hdl.handle.net/2115/94205

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論文情報

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アクセス権	open access
URI	https://hdl.handle.net/2115/94205
タイトル	Anthocyanins act as a sugar-buffer and an alternative electron sink in response to starch depletion during leaf senescence: a case study on a typical anthocyanic tree species, Acer japonicum
著者	Kitao, Mitsutoshi ; Yazaki, Kenichi ; Tobita, Hiroyuki ; Agathokleous, Evgenios ; Kishimoto, Junko ; Takabayashi, Atsushi ; Tanaka, Ryouichi
著者名 Kitao, Mitsutoshi
著者名 Yazaki, Kenichi
著者名 Tobita, Hiroyuki
著者名 Agathokleous, Evgenios
著者名 Kishimoto, Junko
e-Rad_Researcher 90546417 著者名 Takabayashi, Atsushi
e-Rad_Researcher 20311516 著者名 Tanaka, Ryouichi
言語	英語
キーワード	Alternative electron sink
	holocanopy hypothesis
	N resorption
	photoinhibition
	starch depletion
	sugar-buffer
発行日	2024-03-12
出版者	Oxford University Press
収録物名	Journal of Experimental Botany
巻(号)	75(11)
ページ	3521-3541
抄録	We hypothesized that anthocyanins act as a sugar-buffer and an alternative electron sink during leaf senescence to prevent sugar-mediated early senescence and photoinhibition. To elucidate the role of anthocyanin, we monitored seasonal changes in photosynthetic traits, sugar, starch and N contents, pigment composition, and gene expression profiles in leaves exposed to substantially different light conditions within a canopy of an adult fullmoon maple (Acer japonicum) tree. Enhancement of starch amylolysis accompanied by cessation of starch synthesis occurred in the same manner independent of light conditions. Leaf sugar contents increased, but reached upper limits in the late stage of leaf senescence, even though leaf anthocyanins further increased after complete depletion of starch. Sun-exposed leaves maintained higher energy consumption via electron flow than shade-grown leaves during leaf N resorption. Thus, anthocyanins accumulated in sun-exposed leaves might have a regulative role as a sugar-buffer, retarding leaf senescence, and an indirect photoprotective role as an alternative sink for electron consumption to compensate declines in other metabolic processes such as starch and protein synthesis. In this context, anthocyanins may be key substrates protecting both outer-canopy leaves (against photoinhibition) and inner-canopy leaves (via shading by outer-canopy leaves) from high light stress during N resorption.
資源タイプ	学術雑誌論文
出版タイプ	Accepted Manuscript
権利情報	This is a pre-copyedited, author-produced version of an article accepted for publication in Journal of Experimental Botany following peer review. The version of record is available online at: https://doi.org/10.1093/jxb/erae109
PISSN	0022-0957
関連情報 (isVersionOf)	出版社版DOI https://doi.org/10.1093/jxb/erae109