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Jasmonate production through chlorophyll a degradation by Stay-Green in Arabidopsis thaliana

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Title: Jasmonate production through chlorophyll a degradation by Stay-Green in Arabidopsis thaliana
Authors: Ono, Kouhei Browse this author
Kimura, Madoka Browse this author
Matsuura, Hideyuki Browse this author
Tanaka, Ayumi Browse this author →KAKEN DB
Ito, Hisashi Browse this author
Keywords: Arabidopsis
Chlorophyll degradation
Issue Date: Jul-2019
Publisher: Elsevier
Journal Title: Journal of plant physiology
Volume: 238
Start Page: 53
End Page: 62
Publisher DOI: 10.1016/j.jplph.2019.05.004
Abstract: Leaf color change through chlorophyll degradation is a characteristic symptom of senescence. Magnesium removal from chlorophyll a is the initial step in chlorophyll a degradation, in a reaction catalyzed by Stay-Green (SGR). Arabidopsis thaliana has three SGR homologs, SGR1, SGR2, and SGR-like. When SGR1 is overexpressed, both chlorophyll a and b are degraded and leaves turn yellow. This process is visually identical to senescence, suggesting that SGR1 overexpression affects various physiological processes in plants. To examine this possibility, gene expression associated with chlorophyll metabolism and senescence was analyzed following dexamethasone-inducible SGR1 introduction into Arabidopsis. When SGR1 was overexpressed following 18 h of dexamethasone treatment, genes involved in chlorophyll degradation were upregulated, as were senescence-associated genes. These observations suggested that chlorophyll a degradation promotes senescence. As jasmonate is the plant hormone responsible for senescence and was expected to be involved in the regulation of gene expression after dexamethasone treatment, the level of jasmonoyl-isoleucine, the active form of jasmonate, was measured. The jasmonoyl-isoleucine level increased slightly after 10h of SGR1 overexpression, and this increase became significant after 18 h. These observations suggest that jasmonate is produced through chlorophyll a degradation and affects the promotion of senescence.
Rights: ©2019. This manuscript version is made available under the CC-BY-NC-ND 4.0 license
Type: article (author version)
Appears in Collections:低温科学研究所 (Institute of Low Temperature Science) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 伊藤 寿

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