Abstract
Main conclusion
Transcriptomic analysis revealed maleic hydrazide suppresses apical and axillary bud development by altering the expression of genes related to meristem development, cell division, DNA replication, DNA damage and recombination, and phytohormone signaling.
Abstract
Topping (removal of apical buds) is a common agricultural practice for some crop plants including cotton, cannabis, and tobacco. Maleic hydrazide (MH) is a systemic suckercide, a chemical that inhibits shoot bud growth, used to control the growth of apical (ApB) and axillary buds (AxB) following topping. However, the influence of MH on gene expression and the underlying molecular mechanism of controlling meristem development are not well studied. Our RNA sequencing analysis showed that MH significantly influences the transcriptomic landscape in ApB and AxB of chemically topped tobacco. Gene ontology (GO) enrichment analysis revealed that upregulated genes in ApB were enriched for phosphorelay signal transduction, and the regulation of transition timing from vegetative to reproductive phase, whereas downregulated genes were largely associated with meristem maintenance, cytokinin metabolism, cell wall synthesis, photosynthesis, and DNA metabolism. In MH-treated AxB, GO terms related to defense response and oxylipin metabolism were overrepresented in upregulated genes. GO terms associated with cell cycle, DNA metabolism, and cytokinin metabolism were enriched in downregulated genes. Expression of KNOX and MADS transcription factor (TF) family genes, known to be involved in meristem development, were affected in ApB and AxB by MH treatment. The promoters of MH-responsive genes are enriched for several known cis-acting elements, suggesting the involvement of a subset of TF families. Our findings suggest that MH affects shoot bud development in chemically topped tobacco by altering the expression of genes related to meristem development, DNA repair and recombination, cell division, and phytohormone signaling.
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Abbreviations
- ABA:
-
Abscisic acid
- ACO:
-
1-Aminocyclopropane-1-carboxylate oxidase
- ACS:
-
1-Aminocyclopropane-1-carboxylate synthase
- AGL:
-
Agamous-like
- AOS:
-
Allene oxide synthase
- ApB:
-
Apical bud
- AxB:
-
Axillary bud
- ARR:
-
Arabidopsis Response regulators
- APRR:
-
Arabidopsis Pseudo-response regulators
- BARD1:
-
Breast cancer-associated ring domain 1
- BTB/POZ:
-
Bric-à-brac, tramtrack and broad complex/poxvirus and zinc finger
- CDC:
-
Cell division control
- Cdt1:
-
Chromatin licensing and DNA replication factor 1
- CK:
-
Cytokinin
- CPS:
-
ent-Copalyl diphosphate synthase
- CRF:
-
Cytokinin response factor
- DEG:
-
Differentially expressed genes
- Cul4:
-
Uniculme4
- DHAR:
-
Glutathione-dependent dehydroascorbate reductase
- ERF:
-
Ethylene response factor
- ET:
-
Ethylene
- FDR:
-
False discovery rate
- FPKM:
-
Fragments per kilobase of gene per million reads mapped
- GA:
-
Gibberellin
- GGDP:
-
Geranylgeranyl diphosphate
- GAox:
-
GA oxidases
- GO:
-
Gene ontology
- GST:
-
Glutathione S-transferases
- HK:
-
Histidine kinase
- HP:
-
His-containing phosphotransfer protein
- JA:
-
Jasmonic acid
- KNATM:
-
KNOX Arabidopsis thaliana MEINOX
- KNOX:
-
Knotted1-like homeobox
- KO:
-
Ent-kaurine oxidase
- KS:
-
Ent-kaurene synthase
- LAS:
-
Lateral suppressor
- MCM:
-
Minichromosome maintenance
- MH:
-
Maleic hydrazide
- NTPase:
-
Nucleotide triphosphatases
- ORC:
-
Origin recognition complex
- PR genes:
-
Pathogenesis-related genes
- PWMs:
-
Position-specific weight matrices
- RAX:
-
Regulator of axillary meristems
- RIN:
-
RNA integrity number
- REV:
-
Revolute
- ROX:
-
Regulator of axillary meristem formation
- RPN12A:
-
Regulatory particle non-atpase 12A
- SA:
-
Salicylic acid
- SAM:
-
Shoot apical meristem
- SAMT:
-
Salicylic acid carboxyl methyltransferase
- TB1:
-
Teosinte branched 1
- TF:
-
Transcription factor
- TS:
-
Terpene synthase
- TSS:
-
Translation start site
- TSNA:
-
Tobacco-specific nitrosamines
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Acknowledgements
This work is supported partially by grants from the Kentucky Tobacco Research and Development Center, University of Kentucky and The Council for Burley Tobacco, Kentucky, to L.Y. and S.P., and a Graduate Research Fellowship to M.D.R. from Department of Plant Soil Sciences, University of Kentucky.
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Singh, S.K., Richmond, M.D., Pearce, R.C. et al. Maleic hydrazide elicits global transcriptomic changes in chemically topped tobacco to influence shoot bud development. Planta 252, 64 (2020). https://doi.org/10.1007/s00425-020-03460-9
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DOI: https://doi.org/10.1007/s00425-020-03460-9