Abstract
Dark-grown seedlings of Picea abies (L) Karst. are able to accumulate the highest amounts of chlorophyll (Chl) and its precursor protochlorophyllide (Pchlide) in all Pinaceae, but calli derived from 14-d-old green cotyledons of P. abies are completely white during the cultivation in the dark. Pchlide reduction is catalysed in the dark by light-independent protochlorophyllide oxidoreductase (DPOR). This enzyme complex consists of three protein subunits ChlL, ChlN and ChlB, encoded by three plastid genes chlL, chlN and chlB. Using semiquantitative RT-PCR, we observed very low expression of chlLNB genes in dark-grown calli. It seems, that chlLNB expression and thus Chl accumulation could be modulated by light in P. abies calli cultures. This hypothesis is supported by the fact, that we observed low contents of glutamyl-tRNA reductase and Flu-like protein, which probably affected Chl biosynthetic pathway at the step of 5-aminolevulinic acid formation. ChlB subunit was not detected in dark-grown P. abies calli cultures. Our results indicated limited ability to synthesize Chl in callus during cultivation in the dark.
Abbreviations
- ALA:
-
5-aminolevulinic acid
- Chl:
-
chlorophyll
- Chlide:
-
chlorophyllide
- chlLNB :
-
chlL, chlN, chlB genes
- DPOR:
-
light-independent NADPH-protochlorophyllide oxidoreductase
- FLP:
-
Flu-like protein
- GluTR:
-
glutamyl-tRNA reductase
- NAA:
-
1-naphthaleneacetic acid
- LPOR:
-
light-dependent NADPH-protochlorophyllide oxidoreductase
- Pchlide:
-
protochlorophyllide
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Acknowledgements
This work was supported by the Slovak Research and Development Agency (APPV-20-020805). We thank Y. Fujita, J.-D. Rochaix and B. Grimm for providing the primary antibodies used in this work.
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We are very sorry to announce that Prof. J. Hudák passed away.
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Balážová, R., Blehová, A., Demko, V. et al. Influence of irradiance on chlorophyll synthesis in Picea abies calli cultures. Biol Plant 55, 183–186 (2011). https://doi.org/10.1007/s10535-011-0027-5
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DOI: https://doi.org/10.1007/s10535-011-0027-5