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Improving our knowledge on plant architecture and development will help to answer remaining questions in ecology, agronomy and forestry, i.e. regarding plant acclimation and adaptation to changing environments or optimization of plant products. For this purpose, computational plants are becoming more and more popular and a lot of effort is made to build structural and functional models at the organ level in order to simulate plant growth and structure [1]. In this context, scientists need software to measure, analyse and model plant architectures. The Xplo project has been developed in UMR AMAP since 2008 aiming at edition, visualization, exploration and simulation of plant architecture in a userfriendly manner. The software gives interactive tools to handle the plant structure topology (i.e. organ addition/ deletion), geometry (i.e. 3D selection, edition, rotation) and dynamic (i.e. time line, scenarios). It has been used for various types of plant architecture studies (i.e Sunflower [2], Fir Sapling[3], Cecropia, Palm trees [4]). Xplo is fully compatible with the multi-scale tree graphs (MTGs) data structure, which is commonly used to represent plant topology [5]. Users can explore this data structure to find or to improve hypotheses on plant development. Specific data can be extracted with combination of criteria and be visualised in tables and graphs. Simple analysies functions can be launched or data can be exported to external tools, i.e. AMAPMod, R or any other statistical computing environment, for more can integrate their own plant simulation model to the platform and get benefit of its functionalities to test their hypothesis. Different scenarios can be computed for a growth model by interactively modifying model parameters or plant structure (i.e. by pruning) at defined time steps. A plant geometry builder is integrated to Xplo. It allows a 3D plant mockup to be computed according to available geometrical data in the tree graph. If geometrical information

Improving our knowledge on plant architecture and development will help to answer remaining questions in ecology, agronomy and forestry, i.e. regarding plant acclimation and adaptation to changing environments or optimization of plant products. For this purpose, computational plants are becoming more and more popular and a lot of effort is made to build structural and functional models at the organ level in order to simulate plant growth and structure [1]. In this context, scientists need software to measure, analyse and model plant architectures. The Xplo project has been developed in UMR AMAP since 2008 aiming at edition, visualization, exploration and simulation of plant architecture in a userfriendly manner. The software gives interactive tools to handle the plant structure topology (i.e. organ addition/ deletion), geometry (i.e. 3D selection, edition, rotation) and dynamic (i.e. time line, scenarios). It has been used for various types of plant architecture studies (i.e Sunflower [2], Fir Sapling[3], Cecropia, Palm trees [4]). Xplo is fully compatible with the multi-scale tree graphs (MTGs) data structure, which is commonly used to represent plant topology [5]. Users can explore this data structure to find or to improve hypotheses on plant development. Specific data can be extracted with combination of criteria and be visualised in tables and graphs. Simple analysies functions can be launched or data can be exported to external tools, i.e. AMAPMod, R or any other statistical computing environment, for more can integrate their own plant simulation model to the platform and get benefit of its functionalities to test their hypothesis. Different scenarios can be computed for a growth model by interactively modifying model parameters or plant structure (i.e. by pruning) at defined time steps. A plant geometry builder is integrated to Xplo. It allows a 3D plant mockup to be computed according to available geometrical data in the tree graph. If geometrical information