Abstract
Key message
Expression of VaNAC17 improved drought tolerance in transgenic Arabidopsis by upregulating stress-responsive genes, modulating JA biosynthesis, and enhancing ROS scavenging.
Abstract
Water deficit severely affects the growth and development of plants such as grapevine (Vitis spp.). Members of the NAC (NAM, ATAF1/2, and CUC2) transcription factor (TF) family participate in drought-stress-induced signal transduction in plants, but little is known about the roles of NAC genes in drought tolerance in grapevine. Here, we explored the role of VaNAC17 in Vitis amurensis, a cold-hardy, drought-tolerant species of grapevine. VaNAC17 was strongly induced in grapevine by drought, exogenous abscisic acid (ABA), and methyl jasmonate (MeJA). A transient expression assay in yeast indicated that VaNAC17 functions as a transcriptional activator. Notably, heterologous expression of VaNAC17 in Arabidopsis thaliana enhanced drought tolerance. VaNAC17-expressing Arabidopsis plants showed decreased reactive oxygen species (ROS) accumulation compared to wild-type plants under drought conditions. RNA-seq analysis indicated that VaNAC17 expression increased the transcription of downstream stress-responsive genes after 5 days of drought treatment, especially genes involved in jasmonic acid (JA) biosynthesis (such as LOX3, AOC1 and OPR3) and signaling (such as MYC2, JAZ1, VSP1 and CORI3) pathways. Endogenous JA levels increased in VaNAC17-OE plants under drought stress. Taken together, these results indicate that VaNAC17 plays a positive role in drought tolerance by modulating endogenous JA biosynthesis and ROS scavenging.
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The raw data of RNA-seq have been submitted to the Sequence Read Archive database (accession number from SRR6080007 to SRR6080014).
Abbreviations
- ABA:
-
Abscisic acid
- AOC:
-
Allene oxide cyclase
- AOS:
-
Allene oxide synthase
- CDS:
-
Coding sequence
- DAB:
-
Diaminobenzidine
- EL:
-
Electrolyte leakage
- JA:
-
Jasmonic acid
- JAZ:
-
Jasmonate-ZIM domain protein
- LOX:
-
Lipoxygenase
- NAC:
-
NAM, ATAF1/2, and CUC2
- NBT:
-
Nitro blue tetrazolium
- OPR:
-
Oxophytodienoate reductase
- PS II:
-
Photosystem II
- qRT-PCR:
-
Quantitative real-time PCR
- ROS:
-
Reactive oxygen species
- STEM:
-
Short time-series expression miner
- TF:
-
Transcription factor
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Acknowledgements
This work was supported by the National Natural Science Foundation of China (NSFC Accession No.: 31672132), Youth Innovation Promotion Association of Chinese Academy of Sciences (2015281) and Grape Breeding Project of Ningxia (NXNYYZ201502).
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LS, LF and HX: conceived of the study, drafted manuscript; LS, LF, ZZ, LZ, XS and YW: conducted the experiments; QW and SL: corrected manuscript. All authors read and approved the final manuscript.
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Communicated by Prakash Lakshmanan.
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Su, L., Fang, L., Zhu, Z. et al. The transcription factor VaNAC17 from grapevine (Vitis amurensis) enhances drought tolerance by modulating jasmonic acid biosynthesis in transgenic Arabidopsis. Plant Cell Rep 39, 621–634 (2020). https://doi.org/10.1007/s00299-020-02519-x
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DOI: https://doi.org/10.1007/s00299-020-02519-x