Abstract
Gibberellins (GAs) are a large family of tetracyclic diterpenoids, controlling important aspects of growth and development throughout the plant life cycle. To explore the possibility that gibberellin A3 (GA3) signalling induces epigenetic alteration(s), we carried out a field experiment study using Nicotiana tabacum as a model system. The GA3 application on leaves resulted in increased plant-height, foliage density, leaf cell area, and trichome density. The plants exposed to GA3 also exhibited: 1) increased chromatin de-condensation, 2) reduced global DNA methylation, 3) reduced DNA methyltransferases (NtDNMTs) activities accompanied by decreased amounts of NtMET1 and NtCMT3 transcripts, and 4) partial restoration of phenotype and expression of epigenetically silenced reporter transgene. Based on these observations, we propose that GA3 application induces complex epigenetic re-programming, which may lead to distinct developmental phenotypes. These results could provide an important insight for future studies on epigenetic mechanism(s) in other important crops.
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Abbreviations
- Ado-Met:
-
S-adenosyl-methionine
- 5-AZA -C:
-
5-azacytidine
- DNMT:
-
DNA methyltransferase
- DSMO:
-
dimethyl sulfoxide
- GA3 :
-
gibberellin A3
- Gen:
-
genistein
- PTGS:
-
post-transcriptional gene silencing
- TGS:
-
transcriptional gene silencing
- TSA:
-
trichostatin A
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Acknowledgments: We would like to acknowledge Dr. C.C. Lakshmanan (Head), Mr. Ramaswamy [Corporate R&D, ITC Limited, ITC Life Science and Technology Centre (LSTC)] and Czech Science Foundation project (P501/12/G090) for their consistent support. Prof. Ales Kovařík’s laboratory members are duly acknowledged for their support in reporter transgene assays. We would also like to gratefully acknowledge Dr. Ganesh Chowthi Thimmegowda (LSTC-ITC) for his valuable initiative in DNA methylation studies. Our appreciation is also extended to field-workers at Northern Light Soil (NLS) region, Rajahmundry, Andhra Pradesh (A.P.), India, for providing their help and support during field experiments and sample collections.
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Manoharlal, R., Saiprasad, G.V.S., Ullagaddi, C. et al. Gibberellin A3 as an epigenetic determinant of global DNA hypo-methylation in tobacco. Biol Plant 62, 11–23 (2018). https://doi.org/10.1007/s10535-017-0738-3
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DOI: https://doi.org/10.1007/s10535-017-0738-3