Photosynthetica 2003, 41(1):117-126 | DOI: 10.1023/A:1025829017298

Changes in Chloroplast Ultrastructure in Pssu-ipt Tobacco During Plant Ontogeny

H. Synková1,*, R. Pechová1,2, R. Valcke3
1 Institute of Experimental Botany, Academy of Sciences of the Czech Republic, Praha 6, Czech Republic
2 Department of Plant Physiology, Faculty of Sciences, Charles University, Praha 2, Czech Republic
3 Limburgs Universitair Centrum, Department of SBG, Universitair Campus, Diepenbeek, Belgium

Changes in chloroplast ultrastructure and total content of endogenous cytokinins (CK) were studied during different phases of plant development in transgenic Pssu-ipt tobacco (Nicotiana tabacum L. cv. Petit Havana SR1). Permanent overproduction of CK was found in both rooted (SE) and grafted (G) Pssu-ipt plants in all phases of plant development with the peak in vegetative and flowering phase in the latter ones. No such a correlation was observed in SE on the contrary to control non-transgenic plants (SR1) and grafts (SRG), which showed also CK increase at juvenile and flowering phases. No significant differences in parameters of chloroplast ultrastructure, such as length of chloroplast, starch content, granum width, and number of thylakoids per granum, were proved between chloroplasts from young mature leaves of control and transgenic tobacco during plant ontogeny. Nevertheless, several anomalies in the ultrastructure of cell organelles were found in Pssu-ipt tobacco. Amoeboid shape of chloroplasts was often observed in connection with "tubular clusters" resembling peripheral reticulum. The distinct crystalline structures located in chloroplasts might be formed by LHC protein aggregates. Smaller crystals of unknown composition were found also in mitochondria. Numerous crystalline cores were present in peroxisomes. The alterations might be the result of imbalance of phytohormone content, degradation effect of CK overproduction, or the example of acclimation to permanent stress.

Additional key words: chloroplast ultrastructure; cytokinins; grafting; granum; leaf age; Nicotiana; peroxisome; phytohormones; thylakoid; transgenic plants

Published: March 1, 2003  Show citation

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Synková, H., Pechová, R., & Valcke, R. (2003). Changes in Chloroplast Ultrastructure in Pssu-ipt Tobacco During Plant Ontogeny. Photosynthetica, 41(1), 117-126. doi: 10.1023/A:1025829017298
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