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\begin{document}

\title{Light-harvesting activity is targeted by photosystem I photoinhibition
in rice plants irrespective of photosystem I photoinhibitory treatments}



\author[1]{Daisuke Takagi}%
\author[2]{Kentaro Ifuku}%
\author[3]{Wataru Yamori}%
\author[4]{Masaru Kono}%
\author[5]{Tomokazu Ushijima}%
\author[1]{Amane Makino}%
\affil[1]{Tohoku Daigaku Daigakuin Nogaku Kenkyuka Nogakubu}%
\affil[2]{Kyoto Daigaku Nogaku Kenkyuka Nogakubu}%
\affil[3]{University of Tokyo}%
\affil[4]{Tokyo Daigaku Daigakuin Rigakukei Kenkyuka Rigakubu Seibutsu Kagaku Senko}%
\affil[5]{Setsunan Daigaku - Hirakata Campus}%


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  \date{May 17, 2024}


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\begin{abstract}
Overreduction states of photosystem I (PSI) cause PSI photoinhibition.
To examine the degree of PSI photoinhibition, changes in its electron
transport activity and core-subunit content were evaluated. In contrast,
the involvement of peripheral subunits, such as the light-harvesting
complex I (LHCI), is less discussed in PSI photoinhibition. Here, we
aimed to elucidate whether the light-harvesting functions of LHCI are
altered by PSI photoinhibition in rice leaves. To this end, a new method
to estimate the functional antenna size of the PSI-LHCI complex was
developed using a far-red light-dependent absorption change in the
oxidized reaction center chlorophyll (P700 \textsuperscript{+}) in
intact leaves, and the obtained kinetics were analyzed using the double
Gompertz model. Subsequently, our original parameter,
\emph{k\textsubscript{fast}} (Far Red-Photon Flux Density)
\textsuperscript{-1}, showed a linear response to leaf LHCI content, and
the parameter decreased with a decrease in P700 content by PSI
photoinhibition in leaves. Furthermore, we found that the susceptibility
of LHCI to PSI photoinhibitory treatment decreased with increasing in
growth light intensity. Our results suggest that LHCI is a target of PSI
photoinhibition, as well as the core-subunits, and rice plants can lower
the risk of LHCI photoinhibition through light acclimation responses.%
\end{abstract}%



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\verb`PSI-antennna system paper ver22.docx`  available at \url{https://authorea.com/users/553319/articles/605079-light-harvesting-activity-is-targeted-by-photosystem-i-photoinhibition-in-rice-plants-irrespective-of-photosystem-i-photoinhibitory-treatments}\selectlanguage{english}
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