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Simultaneous regulation of antenna size and photosystem I/II stoichiometry in Arabidopsis thaliana

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Title: Simultaneous regulation of antenna size and photosystem I/II stoichiometry in Arabidopsis thaliana
Authors: Jia, Ting Browse this author
Ito, Hisashi Browse this author
Tanaka, Ayumi Browse this author
Keywords: Chlorophyll a oxygenase
Chlorophyll b
Peripheral antenna complexes
Photosystem reassembly
Photosystem stoichiometry
Issue Date: 9-Jul-2016
Publisher: Springer
Journal Title: Planta
Volume: 244
Issue: 5
Start Page: 1041
End Page: 1053
Publisher DOI: 10.1007/s00425-016-2568-5
PMID: 27394155
Abstract: Main conclusionThe photosystem I/II ratio increased when antenna size was enlarged by transient induction of CAO in chlorophyll b -less mutants, thus indicating simultaneous regulation of antenna size and photosystem I/II stoichiometry. Regulation of antenna size and photosystem I/II stoichiometry is an indispensable strategy for plants to acclimate to changes to light environments. When plants grown in high-light conditions are transferred to low-light conditions, the peripheral antennae of photosystems are enlarged. A change in the photosystem I/II ratio is also observed under the same light conditions. However, our knowledge of the correlation between antenna size modulation and variation in photosystem I/II stoichiometry remains limited. In this study, chlorophyll a oxygenase was transiently induced in Arabidopsis thaliana chlorophyll b-less mutants, ch1-1, to alter the antenna size without changing environmental conditions. In addition to the accumulation of chlorophyll b, the levels of the peripheral antenna complexes of both photosystems gradually increased, and these were assembled to the core antenna of both photosystems. However, the antenna size of photosystem II was greater than that of photosystem I. Immunoblot analysis of core antenna proteins showed that the number of photosystem I increased, but not that of photosystem II, resulting in an increase in the photosystem I/II ratio. These results clearly indicate that antenna size adjustment was coupled with changes in photosystem I/II stoichiometry. Based on these results, the physiological importance of simultaneous regulation of antenna size and photosystem I/II stoichiometry is discussed in relation to acclimation to light conditions.
Rights: The final publication is available at Springer via http://dx.doi.org/10.1007/s00425-016-2568-5
Type: article (author version)
URI: http://hdl.handle.net/2115/66518
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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