Abstract
Jujube (Ziziphus jujuba Mill.) holds great importance as a fruit tree in China, with strong tolerance to drought and saline stress, but its growth is limited by vulnerability to cold stress. Consequently, the role of MAPK cascades in mediating jujube cold stress response remains unclear, with the specific function of ZjMAPKK4 in this context yet to be fully elucidated. Thus, in the current study, it was found that ZjMAPKK4 was significantly upregulated compared with other ZjMAPK cascade genes after cold treatment. Heterologous transformation of ZjMAPKK4 in Arabidopsis, VIGS-induced ZjMAPKK4 transiently silencing and overexpression of ZjMAPKK4 in jujube callus assays demonstrated that ZjMAPKK4 positively regulated the cold resistance of jujube. Furthermore, to elucidate the molecular regulation mechanism behind ZjMAPKK4 under cold stress, 25 key DEGs were screened out by transcriptome analysis. Yeast screening cDNA library, yeast two-hybrid, LCA and Co-IP analysis showed ZjMAPKK4 interacted with ZjNAC78 and VIGS-induced ZjNAC78 silenced sour jujube plants showed cold sensitivity and the expression level of cold response genes were downregulated after cold stress. All the results demonstrated that ZjMAPKK4 could interact with ZjNAC78 to regulate the downstream ZjICE-ZjCBF genes to regulate the cold tolerance of jujube.
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Claims 7
Claim · model-written summary
Cold treatment upregulated ZjMAPKK4 relative to other cascade genes.
Verbatim
e0“ZjMAPKK4 was significantly upregulated compared with other ZjMAPK cascade genes after cold treatment”
e1“Jujube (Ziziphus jujuba Mill.)”
Claim · model-written summary
ZjMAPKK4 positively regulated jujube cold resistance.
Verbatim
e0“ZjMAPKK4 positively regulated the cold resistance of jujube”
Claim · model-written summary
Transcriptome analysis screened 25 key differentially expressed genes under cold stress.
Verbatim
e0“under cold stress, 25 key DEGs were screened out by transcriptome analysis”
e1“jujube cold stress response”
Claim · model-written summary
ZjMAPKK4 interacted with ZjNAC78.
Not reportedDirection
Verbatim
e0“ZjMAPKK4 interacted with ZjNAC78”
e1“jujube cold stress response”
Claim · model-written summary
Silencing ZjNAC78 made sour jujube plants cold sensitive.
Not reportedComparatorDirection
Verbatim
e0“VIGS-induced ZjNAC78 silenced sour jujube plants showed cold sensitivity”
Claim · model-written summary
Cold response gene expression was downregulated after cold stress in ZjNAC78 silenced sour jujube.
- Taxon
- sour jujubee0
- Treatment
- VIGS-induced ZjNAC78 silencede0
- Gene
- ZjNAC78e0
- Outcome
- expression level of cold response genese0
- Direction
- downregulatede0
- Qualifier
- after cold stresse0
Not reportedComparator
Verbatim
e0“VIGS-induced ZjNAC78 silenced sour jujube plants showed cold sensitivity and the expression level of cold response genes were downregulated after cold stress”
Claim · model-written summary
The authors infer that ZjMAPKK4 and ZjNAC78 regulate downstream ZjICE-ZjCBF genes and cold tolerance.
Verbatim
e0“ZjMAPKK4 could interact with ZjNAC78 to regulate the downstream ZjICE-ZjCBF genes to regulate the cold tolerance of jujube”