Abstract
Summary 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 JUNGBRUNNEN 1 ( JUB 1) as a regulator of drought tolerance in tomato ( Solanum lycopersicum ). Expression of tomato JUB 1 ( Sl JUB 1 ) is enhanced by various abiotic stresses, including drought. Inhibiting Sl JUB 1 by virus‐induced gene silencing drastically lowers drought tolerance concomitant with an increase in ion leakage, an elevation of hydrogen peroxide (H 2 O 2 ) levels and a decrease in the expression of various drought‐responsive genes. In contrast, overexpression of At JUB 1 from Arabidopsis thaliana increases drought tolerance in tomato, alongside with a higher relative leaf water content during drought and reduced H 2 O 2 levels. At JUB 1 was previously shown to stimulate expression of DREB 2A , a TF involved in drought responses, and of the DELLA genes GAI and RGL 1 . We show here that Sl JUB 1 similarly controls the expression of the tomato orthologs Sl DREB 1 , Sl DREB 2 and Sl DELLA . Furthermore, At JUB 1 directly binds to the promoters of Sl DREB 1 , Sl DREB 2 and Sl DELLA in tomato. Our study highlights JUB 1 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.
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Claims 9
Claim · model-written summary
Abiotic stresses including drought enhanced tomato Sl JUB1 expression.
- Taxon
- tomato
Solanum lycopersicume0 - Treatment
- various abiotic stresses, including droughte0
- Gene
- Sl JUB 1e0
- Outcome
- Expression of tomato JUB 1e0
- Direction
- enhancede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Expression of tomato JUB 1 ( Sl JUB 1 ) is enhanced by various abiotic stresses, including drought.”
Claim · model-written summary
Sl JUB1 silencing lowered tomato drought tolerance.
- Taxon
- tomatoSolanum lycopersicumt0
- Treatment
- virus‐induced gene silencinge0
- Gene
- Sl JUB 1e0
- Outcome
- drought tolerancee0
- Direction
- lowerse0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Inhibiting Sl JUB 1 by virus‐induced gene silencing drastically lowers drought tolerance”
t0“tomato”
Claim · model-written summary
Sl JUB1 silencing increased ion leakage and hydrogen peroxide.
- Taxon
- tomatoSolanum lycopersicumt0
- Treatment
- virus‐induced gene silencinge0
- Gene
- Sl JUB 1e0
- Outcome
- ion leakage, an elevation of hydrogen peroxide (H 2 O 2 ) levelse0
- Direction
- increasee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Inhibiting Sl JUB 1 by virus‐induced gene silencing drastically lowers drought tolerance concomitant with an increase in ion leakage, an elevation of hydrogen peroxide (H 2 O 2 ) levels”
t0“tomato”
Claim · model-written summary
Sl JUB1 silencing decreased drought-responsive gene expression.
- Taxon
- tomatoSolanum lycopersicumt0
- Treatment
- virus‐induced gene silencinge0
- Gene
- Sl JUB 1e0
- Outcome
- expression of various drought‐responsive genese0
- Direction
- decreasee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Inhibiting Sl JUB 1 by virus‐induced gene silencing drastically lowers drought tolerance concomitant with an increase in ion leakage, an elevation of hydrogen peroxide (H 2 O 2 ) levels and a decrease in the expression of various drought‐responsive genes.”
t0“tomato”
Claim · model-written summary
Arabidopsis At JUB1 overexpression increased drought tolerance in tomato.
- Taxon
- tomatoSolanum lycopersicume0
- Treatment
- overexpression of At JUB 1e0
- Gene
- At JUB 1e0
- Outcome
- drought tolerancee0
- Direction
- increasese0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“overexpression of At JUB 1 from Arabidopsis thaliana increases drought tolerance in tomato”
Claim · model-written summary
At JUB1 overexpression raised relative leaf water content during drought.
- Taxon
- tomatoSolanum lycopersicume0
- Treatment
- overexpression of At JUB 1e0
- Gene
- At JUB 1e0
- Outcome
- relative leaf water contente0
- Direction
- highere0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“overexpression of At JUB 1 from Arabidopsis thaliana increases drought tolerance in tomato, alongside with a higher relative leaf water content during drought”
Claim · model-written summary
At JUB1 overexpression reduced hydrogen peroxide levels.
- Taxon
- tomatoSolanum lycopersicume0
- Treatment
- overexpression of At JUB 1e0
- Gene
- At JUB 1e0
- Outcome
- H 2 O 2 levelse0
- Direction
- reducede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“overexpression of At JUB 1 from Arabidopsis thaliana increases drought tolerance in tomato, alongside with a higher relative leaf water content during drought and reduced H 2 O 2 levels.”
Claim · model-written summary
Sl JUB1 controlled expression of Sl DREB1, Sl DREB2 and Sl DELLA.
- Taxon
- tomatoSolanum lycopersicume0
- Gene
- Sl JUB 1e0
- Outcome
- expression of the tomato orthologs Sl DREB 1 , Sl DREB 2 and Sl DELLAe0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Sl JUB 1 similarly controls the expression of the tomato orthologs Sl DREB 1 , Sl DREB 2 and Sl DELLA .”
Claim · model-written summary
At JUB1 directly bound promoters of Sl DREB1, Sl DREB2 and Sl DELLA in tomato.
- Taxon
- tomatoSolanum lycopersicume0
- Gene
- At JUB 1e0
- Outcome
- directly binds to the promoters of Sl DREB 1 , Sl DREB 2 and Sl DELLAe0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“At JUB 1 directly binds to the promoters of Sl DREB 1 , Sl DREB 2 and Sl DELLA in tomato.”
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