Abstract
Total chlorophyll content and chlorophyllase (chlorophyll-chlorophyllido hydrolase EC 3.1.1.14) activity in fresh leaves of Piper betle L. landrace KS was, respectively, twofold higher and eight fold lower than KV, showing negative correlation between chlorophyll and chlorophyllase activity. Specific chlorophyllase activity was nearly eightfold more in KV than KS. ORF of 918 nt was found in cloned putative chlorophyllase cDNAs from KV and KS. The gene was present as single copy in both the landraces. The encoded polypeptide of 306 amino acids differed only at two positions between the KV and KS; 203 (cysteine to tyrosine) and 301 (glutamine to glycine). Difference in chlorophyllase gene expression between KV and KS was evident in fresh and excised leaves. Up regulation of chlorophyllase gene by ABA and down regulation by BAP was observed in both the landraces; however, there was quantitative difference between KV and KS. Data suggests that chlorophyllase in P. betle is involved in chlorophyll homeostasis and chlorophyll loss during post harvest senescence.
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Abbreviations
- Chl:
-
Chlorophyll
- Chlase:
-
Chlorophyllase
- KV:
-
Kapoori Vellaikodi
- KS:
-
Khasi Shillong
- PT:
-
Post treatment
- PAR:
-
Photosynthetically active radiation
- Chlid:
-
Chlorophyllide
- nt:
-
Nucleotide
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Acknowledgments
We are thankful to Department of Science and Technology (DST), New Delhi for partial support of the studies by Grant No. SP/SO/A42/95. SG worked as project fellow in DST project and later as CSIR Senior Research Fellow. Dr S.A. Ranade for drawing tree view and helpful discussions.
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Database accession numbers: Kapoori Vellaikodi: Accession No. AY327108, Khasi Shillong: Accession No. DQ911625. Genomic sequence of KS: Accession No. DQ444457.
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Gupta, S., Gupta, S.M., Sane, A.P. et al. Chlorophyllase in Piper betle L. has a role in chlorophyll homeostasis and senescence dependent chlorophyll breakdown. Mol Biol Rep 39, 7133–7142 (2012). https://doi.org/10.1007/s11033-012-1545-8
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DOI: https://doi.org/10.1007/s11033-012-1545-8