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\section{Hetereogeneity in LR traits}  \subsection{Plasticity}  \subsubsection{The Drew scheme}  \subsection{Stochastic variability}  \section{How this variability is generated and regulated?}  \subsection{Hormonal signalling and root development}  \cite{Perilli2012}  \section{Can heterogeneity be predict predicted?}  \subsection{Morphological traits to predict}  \cite{(Pagès&Draye2010}