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Some plants use pigments to form different colours but some flower use structures instead; small ridges interact with visible light waves to form iridescent patterns to attract pollinators. Studying how plant cells form these structures without collapsing involves intricate measurements and observations. So Dr Sarah Robinson, group leader at the SLCU, developed a robotic microscope system called ACME (automated confocal micro-extensometer) that stretches individual plant petals, visualises how the cells deform and measures mechanical properties of plants! 0:00 Introduction 0:28 Structural colour 2:06 How do cells form an organised pattern? 3:45 Micro-robotics and mechanical stress 6:34 Stretching petals 9:33 Modelling the mechanical properties of cells 11:03 Conclusions Speaker profile: Sarah Robinson is Group Leader of the Robinson Group at the Sainsbury Laboratory at Cambridge University (SLCU). Her group uses a combination of robotics, genetic engineering and mathematical modelling to investigate plant development. "I am fascinated by the process of development. My research focuses on plant development and how growth, cell division and differentiation are coordinated. I am particularly interested in how cell and organ size and shape are determined and am investigating these processes using biomechanics, modelling and genomic approaches. How dynamic spatial patterns are generated within growing proliferating tissues is crucial to understanding development in multi-cellular organisms. However, this process is poorly understood due to difficulties in unravelling the interactions between the many processes that occur at once. My PhD investigation of this problem involved looking at the patterning of stomata in growing Arabidopsis leaves at the John Innes Centres. Growth was an ever-present topic during my PhD, and this motivated me to further investigate mechanics in collaboration with experts in this field as an EMBO Research Fellow in the lab of Professor Cris Kuhlemeier at the University of Bern. It was here that I developed new methods for studying biomechanics in plant development."