Abstract
Stroma, envelope and thylakoid membranes were prepared from chloroplasts isolated from leaves of Beta vulgaris. Out of total plastidic protochlorophyllide, envelope membranes contained 1.5%, thylakoids had the maximum 98.48% and stroma had a trace fraction of 0.02%. Distribution of the Mg-protoporphyrin IX and its monoester was 89.0% in thylakoids, 10.0% in stroma and 1.0% in envelope. A substantial fraction (33.77%) of plastidic protoporphyrin IX was partitioned into stroma. Envelope contained 0.66% and thylakoids had 65.57% of the total plastidic protoporphyrin IX pool. The proportion of monovinyl and divinyl forms of protochlorophyllide was almost similar in intact plastid, thylakoids, and outer and inner envelope membranes suggesting a tight regulation of vinyl reductase enzyme. The significance of differential distribution of chlorophyll biosynthetic intermediates among thylakoids, envelope and stroma is discussed.
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Abbreviations
- ALA:
-
5-Aminolevulinic acid
- Chl:
-
Chlorophyll
- Chlide:
-
Chlorophyllide
- DV Pchlide:
-
Divinyl protochlorophyllide
- HEAR:
-
Hexane extracted acetone residue solvent mixture
- LHCP II:
-
Light harvesting chlorophyll protein complex II
- MP(E):
-
Mg-protoporphyrin IX + its monoester
- MV Pchlide:
-
Monovinyl protochlorophyllide
- Pchlide :
-
Protochlorophyllide
- Proto IX:
-
Protoporphyrin IX
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Acknowledgments
We wish to thank Kenneth Keegstra, East Lansing, USA for OM 14 antibodies and Dr. A Matto, Beltsville, USA for LHCPII antibodies.
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This work was supported by a grant from the Council of Scientific and Industrial Research (38/1079/03/EMRII) to BCT.
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Mohapatra, A., Tripathy, B.C. Differential distribution of chlorophyll biosynthetic intermediates in stroma, envelope and thylakoid membranes in Beta vulgaris . Photosynth Res 94, 401–410 (2007). https://doi.org/10.1007/s11120-007-9209-6
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DOI: https://doi.org/10.1007/s11120-007-9209-6