Abstract
Tobacco is an essential cash crop, but drought has become a major factor in the decline of global tobacco production as a result of changes in the global climate. The HtrA protease is an oligomeric serine endopeptidase that responds to stress in plants. DEGP5 is a member of the gene family that encodes HtrA protease, which promotes plant adaptation to adversity. The aim of this study was to investigate the role and mechanism employed by the DEGP5 gene in response to drought stress in tobacco. NtDEGP5-overexpression lines were obtained by genetic transformation and the phenotypes and transcriptomes of NtDEGP5-overexpression lines and wild-type (K326) tobacco seedlings were compared under drought stress. The results demonstrated that plants overexpressing NtDEGP5 exhibited greater drought tolerance. The differentially expressed genes involved in the regulation of drought tolerance by DEGP5 were enriched in metabolic pathways, such as plant-pathogen interaction and glutathione metabolism, with the plant-pathogen interaction pathway having the most differentially expressed genes. An analysis of the plant-pathogen interaction pathway revealed that these genes contributed to the suppression of plastid extracellular Ca2+ signaling and flagellin signaling to inhibit reactive oxygen species production, and that lower levels of reactive oxygen species act as a signal to regulate the activation of the antioxidant system, further balancing the production and removal of reactive oxygen species in tobacco seedlings under drought stress. These findings suggest that the NtDEGP5 gene can enhance the drought tolerance of tobacco by regulating the homeostasis of reactive oxygen species by inhibiting extracellular plastids.
Key message
The NtDEGP5 gene in tobacco decreased ROS production by inhibiting intracellular transduction of plastid extracellular Ca2+ and flagellin signaling, thereby enhancing the mutant's drought resistance.
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Data availability
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Abbreviations
- Pro:
-
Proline
- MDA:
-
Malondialdehyde
- SOD:
-
Superoxide dismutase
- POD:
-
Peroxidase
- CAT:
-
Catalase
- H2O2 :
-
Hydrogen peroxide
- O2·− :
-
Superoxide anion
- DEGs:
-
Differentially expressed genes
- GO:
-
Gene ontology
- KEGG:
-
Kyoto encyclopedia of genes and genomes
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National Natural Science Foundation of China (32060510), Guizhou Provincial Science and Technology Department ([2016] 5663), and Guizhou Provincial Tobacco Company (2022XM02).
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CG: provided experimental design and wrote the original manuscript, writing-review, and editing. SYQ and JZL: performed the experiments and validation. DLL and MZJ: performed the methodology and validation. LRX provided experimental design, supervision, and manuscript revision.
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Chen, G., Shu, Y., Jian, Z. et al. The NtDEGP5 gene improves drought tolerance in tobacco (Nicotiana tabacum L.) by dampening plastid extracellular Ca2+ and flagellin signaling and thereby reducing ROS production. Plant Mol Biol 113, 265–278 (2023). https://doi.org/10.1007/s11103-023-01388-8
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DOI: https://doi.org/10.1007/s11103-023-01388-8