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\cite{Perilli2012,Band2012a}  This model is consitent with the observation of a pick of GA in the TZ and a progressive dilution in the EZ in maize leafs   \cite{Nelissen2012}  Questions: which drives cell elongation? Role of ethylen? Ethylene \textbf{Ethylene}  regulated the maximal rate of relative elongation \cite{Ma2003a}. \section{How can elongation rates be predicted?}  \subsection{From morphological traits}