Journal
PLANT DIRECT
Volume 6, Issue 10, Pages -Publisher
JOHN WILEY & SONS LTD
DOI: 10.1002/pld3.456
Keywords
abiotic stress; Arabidopsis DREB1a; drought stress; Oryza sativa; salinity stress; stress tolerance; transcriptome
Categories
Funding
- EPSCoR [1826836]
- ABI-Division of Agriculture
- Office of Integrative Activities
- Office Of The Director [1826836] Funding Source: National Science Foundation
Ask authors/readers for more resources
This study investigates the early responses associated with the expression of Arabidopsis dehydration response element binding 1a (DREB1a) in transgenic rice. The findings demonstrate that DREB1a can be co-localized with other genes to enhance multigenic traits. The transgenic rice lines showed improved tolerance to salinity stress and water withholding. RNA sequencing and transcriptome analysis revealed complex transcriptional networks and metabolic reprogramming induced by DREB1a expression. Additionally, potentially novel pathways, such as jasmonate, auxin, and ethylene signaling, were identified, along with the upregulation of multiple transcription factor gene families.
Overexpression of Arabidopsis dehydration response element binding 1a (DREB1a) is a well-known approach for developing salinity, cold and/or drought stress tolerance. However, understanding of the genetic mechanisms associated with DREB1a expression in rice is generally limited. In this study, DREB1a-associated early responses were investigated in a transgenic rice line harboring cold-inducible DREB1a at a gene stacked locus. Although the function of other genes in the stacked locus was not relevant to stress tolerance, this study demonstrates DREB1a can be co-localized with other genes for multigenic trait enhancement. As expected, the transgenic lines displayed improved tolerance to salinity stress and water withholding as compared with non-transgenic controls. RNA sequencing and transcriptome analysis showed upregulation of complex transcriptional networks and metabolic reprogramming as DREB1a expression led to the upregulation of multiple transcription factor gene families, suppression of photosynthesis, and induction of secondary metabolism. In addition to the detection of previously described mechanisms such as production of protective molecules, potentially novel pathways were also revealed. These include jasmonate, auxin, and ethylene signaling, induction of JAZ and WRKY regulons, trehalose synthesis, and polya mine catabolism. These genes regulate various stress responses and ensure timely attenuation of the stress signal. Furthermore, genes associated with heat stress response were downregulated in DREB1a expressing lines, suggesting antagonism between heat and dehydration stress response pathways. In summary, through a complex transcriptional network, multiple stress signaling pathways are induced by DREB1a that presumably lead to early perception and prompt response toward stress tolerance as well as attenuation of the stress signal to prevent deleterious effects of the runoff response.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available