Notizen: Changes in the Iron and Phosphorus Content of Stroma Inclusions during Etioplast-Chloroplast Development in Nicotiana
2014
Jülich, B. | Gliem, G. | Jánossy, A. G S
Conformational changes of the thylakoid arrangement during light-dependent etioplast-chloroplast development in cotyledons of Nicotiana clevelandii X N. glutinosa are correlated with a decrease of the iron and phosphorus content in electron-dense stroma inclusions. Parallel to the transformation of the prolamellar body and the stacking process of the thylakoids, both the iron and phosphorus content of the inclusions were found to be reduced. Their elemental composition was analysed by means of the energy-dispersive X-ray microanalysis. Due to their high electron-density these stroma inclusions can be observed by conventional transmission electron microscopy in unstained thin-sections from exclusively glutaraldehyde-fixed material. They seem to be involved in membrane formation processes concomitant with the dispersal of the prolamellar bodies. Thus, the iron and phosphorus containing inclusions were found either closely surrounded by membranes or in the intralamellar space of plastids from plantlets illuminated for 1 - 8 hours. In chloroplasts (illumination period 12 -24 hours) no connections between these inclusions and the thylakoids were noticed.
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