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Rice OsHsp16.9A interacts with OsHsp101 to confer thermotolerance
Yi-Hsin Liu1, Tong-Seung Tseng2, Ching-Rong Wu1
1Department of Life Sciences, National Central University, Taoyuan, Taiwan.
Plant Science : an International Journal of Experimental Plant Biology
|February 12, 2023
Summary
Rice heat shock proteins OsHsp16.9A and OsHsp101 interact to enhance plant thermotolerance. This interaction is crucial for improving seed germination and seedling survival under heat stress conditions.
Area of Science:
- Plant Biology
- Molecular Biology
- Biochemistry
Background:
- Class I small heat shock proteins (sHSPs) play vital roles in plant stress response.
- OsHsp16.9A and OsHsp18.0 are rice sHSPs that accumulate under heat stress.
- Overexpression of these sHSPs confers distinct thermoprotective effects in rice.
Purpose of the Study:
- To investigate the functional roles of OsHsp16.9A in rice thermotolerance.
- To identify proteins that interact with OsHsp16.9A.
- To elucidate the mechanism of OsHsp16.9A-mediated thermoprotection.
Main Methods:
- Mass spectrometry to identify OsHsp16.9A-interacting proteins.
- In vitro assays to assess complex formation under heat stress.
- Ratiometric bimolecular fluorescence complementation (BiFC) for co-localization studies.
- Amino acid mutation studies to identify critical interaction domains.
Main Results:
- OsHsp101 was identified as a key interacting protein with OsHsp16.9A in rice seeds.
- OsHsp16.9A and OsHsp101 form a heat-stable complex and co-localize in planta.
- Specific amino acid residues in OsHsp16.9A are essential for interaction with OsHsp101.
- OsHsp16.9A-OsHsp101 interaction is vital for conferring thermotolerance to rice, particularly for seed germination.
Conclusions:
- The interaction between OsHsp16.9A and OsHsp101 is essential for conferring thermotolerance in rice.
- OsHsp16.9A enhances thermotolerance through its interaction with OsHsp101.
- Understanding this interaction provides insights into improving crop resilience to heat stress.
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