NAC transcription factor JUNGBRUNNEN1 enhances drought tolerance in tomato
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Type
ArticleAuthors
Thirumalaikumar, Venkatesh P.Devkar, Vikas
Mehterov, Nikolay
Ali, Shawkat

Ozgur, Rengin
Turkan, Ismail
Mueller-Roeber, Bernd
Balazadeh, Salma
KAUST Department
Biological and Environmental Sciences and Engineering (BESE) DivisionDesert Agriculture Initiative
Date
2017-08-04Online Publication Date
2017-08-04Print Publication Date
2018-02Permanent link to this record
http://hdl.handle.net/10754/625184
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Water deficit (drought stress) massively restricts plant growth and the yield of crops; reducing the deleterious effects of drought is therefore of high agricultural relevance. Drought triggers diverse cellular processes including the inhibition of photosynthesis, the accumulation of cell-damaging reactive oxygen species, and gene expression reprogramming, besides others. Transcription factors (TF) are central regulators of transcriptional reprogramming and expression of many TF genes is affected by drought, including members of the NAC family. Here, we identify the NAC factor JUNGBRUNNEN1 (JUB1) as a regulator of drought tolerance in tomato (Solanum lycopersicum). Expression of tomato JUB1 (SlJUB1) is enhanced by various abiotic stresses, including drought. Inhibiting SlJUB1 by virus-induced gene silencing drastically lowers drought tolerance concomitant with an increase in ion leakage, an elevation of hydrogen peroxide (H2 O2 ) levels, and a decrease of the expression of various drought-responsive genes. In contrast, overexpression of AtJUB1 from Arabidopsis thaliana increases drought tolerance in tomato, alongside with a higher relative leaf water content during drought and reduced H2 O2 levels. AtJUB1 was previously shown to stimulate expression of DREB2A, a TF involved in drought responses, and of the DELLA genes GAI and RGL1. We show here that SlJUB1 similarly controls the expression of the tomato orthologs SlDREB1, SlDREB2, and SlDELLA. Furthermore, AtJUB1 directly binds to the promoters of SlDREB1, SlDREB2 and SlDELLA in tomato. Our study highlights JUB1 as a transcriptional regulator of drought tolerance and suggests considerable conservation of the abiotic stress-related gene regulatory networks controlled by this NAC factor between Arabidopsis and tomato. This article is protected by copyright. All rights reserved.Citation
Thirumalaikumar VP, Devkar V, Mehterov N, Ali S, Ozgur R, et al. (2017) NAC transcription factor JUNGBRUNNEN1 enhances drought tolerance in tomato. Plant Biotechnology Journal. Available: http://dx.doi.org/10.1111/pbi.12776.Sponsors
This work was supported by funding from the Deutsche Forschungsgemeinschaft (DFG) to S.B. (BA 4769/2-1). Financial support was furthermore provided by the University of Potsdam and the MPI of Molecular Plant Physiology.Publisher
WileyJournal
Plant Biotechnology JournalPubMed ID
28640975Additional Links
http://onlinelibrary.wiley.com/doi/10.1111/pbi.12776/abstractae974a485f413a2113503eed53cd6c53
10.1111/pbi.12776
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