Az Eszterházy Károly Tanárképző Főiskola Tudományos Közleményei. 2004. Sectio Biologiae. (Acta Academiae Paedagogicae Agriensis : Nova series ; Tom. 25)

Mustárdy, L.: Tree-dimensional Organization of Thylakoid System in Granal Chloroplasts and its Functional Role

108 Mustárdy L. Fig. 4 'Computerizedform

' of the 3D model constructed from electron micrographs offull serial sectioning of a granum-stroma assembly. In the model, some stroma thylakoids are removedfrom the granum stacks to show the slits where the two types of thylakoids are connected. Fig. 5 Thin sections from a full series (a-c), and different views of the 3D computer model of adjacent granum-stroma assemblies (d-e). It can be seen that the stroma thylakoids 'continue

' the granum lamellae. However, for their helical arrangement the stroma thylakoids in different sections do not always run to the same thylakoid of the granum (indicated by the arrows). It is also clear (a-c) that there is a significant variation in the diameter of the stacks; this is not reflected in the schematic views in (d) and (e) which merely illustrate the fusion at the outer edges of the stroma membranes of the two grana, i.e. of the two granum-stroma units, (f) The key structural element, the 'unit cell' of the mathematical model of the granum-stroma assembly.