Light and temperature regulation of greening in dark-grown ginkgo (Ginkgo biloba)

Authors: Skribanek, Anna; Solymosi, Katalin; Hideg, Éva; Böddi, Béla

Source: Physiologia Plantarum, Volume 134, Number 4, December 2008 , pp. 649-659(11)

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Abstract:

The last steps of chlorophyll (Chl) biosynthesis were studied at different light intensities and temperatures in dark-germinated ginkgo (Ginkgo biloba L.) seedlings. Pigment contents and 77 K fluorescence emission spectra were measured and the plastid ultrastructure was analysed. All dark-grown organs contained protochlorophyllide (Pchlide) forms with similar spectral properties to those of dark-grown angiosperm seedlings, but the ratios of these forms to each other were different. The short-wavelength, monomeric Pchlide forms were always dominating. Etioplasts with small prolamellar bodies (PLBs) and few prothylakoids (PTs) differentiated in the dark-grown stems. Upon illumination with high light intensities (800 μmol m⁻² s⁻¹ photon flux density, PFD), photo-oxidation and bleaching occurred in the stems and the presence of ¹O₂ was detected. When Chl accumulated in plants illuminated with 15 μmol m⁻² s⁻¹ PFD it was significantly slower at 10°C than at 20°C. At room temperature, the transformation of etioplasts into young chloroplasts was observed at low light, while it was delayed at 10°C. Grana did not appear in the plastids even after 48 h of greening at 20°C. Reaccumulation of Pchlide forms and re-formation of PLBs occurred when etiolated samples were illuminated with 200 μmol m⁻² s⁻¹ PFD at room temperature for 24 h and were then re-etiolated for 5 days. The Pchlide forms appeared during re-etiolation had similar spectral properties to those of etiolated seedlings. These results show that ginkgo seedlings are very sensitive to temperature and light conditions during their greening, a fact that should be considered for ginkgo cultivation.

Document Type: Research article

DOI: http://dx.doi.org/10.1111/j.1399-3054.2008.01166.x

Affiliations: 1: Institute of Plant Biology, Biological Research Center, Szeged, Temesvári krt. 62, H-6726 Hungary

Publication date: 2008-12-01

Light and temperature regulation of greening in dark-grown ginkgo (Ginkgo biloba)

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