Photosynthetica, 2009 (vol. 47), issue 4

Photosynthetica 2009, 47(4):510-516 | DOI: 10.1007/s11099-009-0076-6

Chlorophyll biosynthesis and chloroplast development in etiolated seedlings of Ginkgo biloba L.

A. Pavlovič1,*, Ľ. Slováková1, V. Demko1, M. Durchan2, K. Mikulová1, J. Hudák1
1 Department of Plant Physiology, Faculty of Natural Sciences, Comenius University in Bratislava, Bratislava, Slovak Republic
2 Biology Centre, Academy of Sciences, České Budějovice, Czech Republic

Ginkgo biloba L. is a large tree native in China with evolutionary affinities to the conifers and cycads. However unlike conifers, the gymnosperm G. biloba is not able to synthesize chlorophyll (Chl) in the dark, in spite of the presence of genes encoding subunits of light-independent protochlorophyllide oxidoreductase (DPOR) in the plastid genome. The principal aims of the present study were to investigate the presence of DPOR protein subunits (ChlL, ChlN, ChlB) as well as the key regulatory step in Chl formation: aminolevulinic acid (ALA) synthesis and abundance of the key regulatory enzyme in its synthesis: glutamyl-tRNA reductase (GluTR). In addition, functional stage of photosynthetic apparatus and assembly of pigment-protein complexes were investigated. Dark-grown, illuminated and circadian-grown G. biloba seedlings were used in our experiments. Our results clearly showed that no protein subunits of DPOR were detected irrespective of light conditions, what is consistent with the absence of Chl and Chl-binding proteins (D1, LHCI, LHCIIb) in the dark. This correlates with low ALA-synthesizing capacity and low amount of GluTR. The concentration of protochlorophyllide (Pchlide) in the dark is low and non-photoactive form (Pchlide633) was predominant. Plastids were developed as typical etioplasts with prollamelar body and few prothylakoid membranes. Continual illumination (24 h) only slightly stimulated ALA and Chl synthesis, although Pchlide content was reduced. Prollamelar bodies disappeared, but no grana were formed, what was consistent with the absence of D1, LHCI, LHCIIb proteins. Lightinduced development of photosynthetic apparatus is extremely slow, as indicated by Chl fluorescence and gas exchange measurements. Even after 72 h of continuous illumination, the values of maximum (Fv/Fm) and effective quantum yield (ΦPSII) and rate of net photosynthesis (PN) did not reach the values comparable with circadian-grown plants.

Keywords: aminolevulinic acid; chlorophyll; Ginkgo biloba; gymnosperms; light-independent chlorophyll biosynthesis; protochlorophyllide; protochlorophyllide oxidoreductase

Received: June 15, 2009; Accepted: September 29, 2009; Published: December 1, 2009Show citation

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Pavlovič, A., Slováková, Ľ., Demko, V., Durchan, M., Mikulová, K., & Hudák, J. (2009). Chlorophyll biosynthesis and chloroplast development in etiolated seedlings of Ginkgo biloba L. Photosynthetica, 47(4), 510-516. doi: 10.1007/s11099-009-0076-6.
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