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\begin{document}

\title{Leaf day respiration: more than just catabolic CO 2 production in the
light}



\author[1]{Guillaume Tcherkez}%
\author[2]{Cyril Abadie}%
\author[1]{Corentin Dourmap}%
\author[1]{Julie Lalande}%
\author[1]{Anis Limami}%
\affil[1]{Institut de Recherche en Horticulture et Semences}%
\affil[2]{Ecophysiologie et Genomique Fonctionnelle de la Vigne}%


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  \date{June 15, 2024}


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\begin{abstract}
Illuminated leaves assimilate CO \textsubscript{2} via gross
photosynthesis and liberate CO \textsubscript{2} via photorespiration
and `day respiration', often denoted as \emph{R} \textsubscript{d}. Day
respiration is a minor CO \textsubscript{2}-exchange component of net
photosynthesis but is important for carbon use efficiency, computations
of internal conductance, or the interpretation of net photosynthetic
\textsuperscript{12}C/ \textsuperscript{13}C fractionation.
Unfortunately, there is no simple method to measure \emph{R}
\textsubscript{d} and tracing the origin of C-atoms found in
day-respired CO \textsubscript{2} is difficult. As a result, a common
misconception is that day respiration is simply a catabolic, CO
\textsubscript{2}-producing flux through ordinary catabolism (glycolysis
and Krebs `cycle'). In the past few years, considerable progress has
been made in our understanding of day respiration. It appears that
\emph{R} \textsubscript{d} is a net flux resulting from several CO
\textsubscript{2}-generating and CO \textsubscript{2}-fixing reactions,
not only related to catabolism but also to anabolism (biosyntheses). In
addition, there is now direct evidence that decarboxylating reactions
are partly fed by carbon sources disconnected from current
photosynthesis and this effect has consequences for isotopic
mass-balance. Therefore, leaf day `respiration' is much more than just
CO \textsubscript{2} production by respiratory catabolism. Rather, it
reflects whole metabolic orchestration of leaves from N fixation to
secondary metabolism and it perhaps deserves another name, such as ``day
decarboxylations''.%
\end{abstract}%



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\verb`Opinion day respiration CA.docx`  available at \url{https://authorea.com/users/383913/articles/723867-leaf-day-respiration-more-than-just-catabolic-co-2-production-in-the-light}

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