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\section{How this variability is generated and regulated?}  \subsection{Hormonal signalling and root development}  \textbf{Auxin} as promoter of cell division usutaining the activity of the PIN genes; \textbf{cytokynin} with an antagonist role promoter of cell differenciation at the root meristem TZ. \textbf{Gibellerins}, an additional regulator of root growth, selectively repress expression of ARR1 cytokinin-response transcription factor, allowing cell division to prevail over cell differentiation at early stages of meristem development, and the root meristem to build up. The onset of the cell elongation provoques the dilution of GA (a slow-moving phytohorme, in contrast to AUX moving from cell to cell at ~1cm/h and for which the dilution effect is predicted to be negligible),  \cite{Perilli2012}  \cite{Band2012a}  \section{Can heterogeneity be predict predicted?}  \subsection{Morphological traits}