Sequential Replicas: Method for In Vivo Imaging of Plant Organ Surfaces that Undergo Deformation.

Complex geometry of plant organs and various types of organ surface deformation, including growth or hygroscopic movements, can be analyzed using sequential replica method. It enables obtaining a time-lapse series of high resolution images visualizing details of the examined surface and provides data sufficient for detailed computation of parameters characterizing surface deformation and geometry. Series of molds, made in dental polymer, representing the examined surface are used to obtain casts in epoxy resin or nail polish replicas, which are ready for microscopic examination, while the structure itself remains intact. Images obtained from the epoxy casts in scanning electron microscopy can be further used for 3D reconstruction and computation of local geometry. The sequential replica method is a universal method and can be applied to image complex shapes of a range of structures, like meristems, flowers, leaves, scarious bracts, or trichomes. Different plant species growing in various conditions can be studied.