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The tomato OST1-VOZ1 module regulates drought-mediated flowering
Leelyn Chong1,2, Rui Xu1,2, Pengcheng Huang1,2
1State Key Laboratory of Crop Stress Adaptation and Improvement, School of Life Sciences, Henan University, Kaifeng 475001, China.
The Plant Cell
|January 31, 2022
Summary
Tomato plants with impaired OPEN STOMATA 1 (SlOST1) show reduced drought tolerance and delayed flowering. SlOST1 regulates flowering under drought by stabilizing the SlVOZ1 transcription factor, crucial for drought-responsive flowering.
Area of Science:
- Plant Biology
- Molecular Genetics
- Agricultural Science
Background:
- Flowering time is a key agricultural trait influencing tomato yield.
- Drought stress impacts flowering, but the underlying molecular mechanisms in tomato are not fully understood.
Purpose of the Study:
- To elucidate the molecular mechanism of drought-regulated flowering in tomato.
- To investigate the role of OPEN STOMATA 1 (SlOST1) in drought stress response and flowering time.
Main Methods:
- Characterization of slost1 loss-of-function mutants under normal and drought conditions.
- Investigating the interaction and phosphorylation of SlVOZ1 by SlOST1 using biochemical assays.
- DNA affinity purification sequencing to identify SlVOZ1 binding sites.
- Analysis of the effect of SlVOZ1 on the promoter of the SINGLE FLOWER TRUSS gene.
Main Results:
- Loss of SlOST1 function leads to reduced drought tolerance and a late flowering phenotype.
- SlOST1 directly interacts with and phosphorylates SlVOZ1, enhancing its stability and nuclear translocation in an ABA-dependent manner.
- SlVOZ1 binds to the promoter of the SINGLE FLOWER TRUSS gene, promoting flowering transition under drought stress.
Conclusions:
- The SlOST1-SlVOZ1 module plays a critical role in regulating tomato flowering in response to drought.
- This study reveals a novel mechanism balancing drought stress response and flowering in tomato, offering potential strategies for crop improvement.
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