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

Three Dimensional Organisation of Thylakoid System. 107 Fig. 3 Evidences of helical arrangement of stroma membranes around the granum by different electron microscopic techniques. (A) Part of a 'conventional

' thin section of a chloroplast. On the right hand side, the micrograph shows a granum-stroma assembly with a near-median section, i.e. cut close to the margin; hence, virtually only the stroma thylakoids are to be seen, tilted at an angle of approx. 20° with respect to the main axis of the granum. (B) On freeze-fractured chloroplast when the fractured plane is parallel with the granum thylakoid (G), stroma thylakoidjunctions (arrowheads) are arranged in a circular fashion that surrounds the granum membrane. (C) Scanning electron micrograph of an isolated granum; after sonication, the stroma thylakoids are broken down from the more rigid granum body; the narrow strips of remaining stroma lamellae exhibit a helical arrangement, (bars 0.2 /urn.)