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Rubisco Activase Is Also a Multiple Responder to Abiotic Stresses in Rice.
Yue Chen1, Xiao-Man Wang1, Li Zhou1
1State Key Laboratory of Plant Physiology and Biochemistry, College of Life Sciences, Zhejiang University, Hangzhou, 310058, China.
Ribulose-1,5-bisphosphate carboxylase/oxygenase activase (RCA) is crucial for photosynthesis and abiotic stress response in rice. The study reveals RCA, particularly RCAL, acts as a multiple stress responder, enhancing our understanding of its functions.
Area of Science:
- Plant Biology
- Molecular Biology
- Biochemistry
Background:
- Ribulose-1,5-bisphosphate carboxylase/oxygenase activase (RCA) is a nuclear-encoded chloroplast protein vital for photosynthesis.
- RCA's role in acclimation to abiotic stresses is suggested but not fully understood.
Purpose of the Study:
- To analyze stress-responsive elements in the RCA gene promoter (2.0 kb 5'-upstream region).
- To investigate the primary, secondary, and tertiary structures of the RCA protein.
- To elucidate the role of RCA isoforms in rice adaptation to abiotic stresses.
Main Methods:
- Analysis of cis-elements in the RCA promoter.
- Amino acid and evolutionary analyses of RCA protein.
- Structural analysis (secondary and tertiary) of RCA proteins.
- Quantification of RCA isoform transcription and translation levels under stress.
Main Results:
- Multiple stress-related cis-elements were identified in the RCA promoter.
- RCA proteins exhibit conserved regions but vary in size and type across species.
- Significant differences were observed in secondary, binding, and tertiary structures of RCA proteins.
- Both RCA isoforms' transcription and translation increased under stress, with RCAL showing a more significant increase.
Conclusions:
- RCA, especially the large isoform (RCAL), functions as a multiple abiotic stress responder in rice.
- Differential expression and structural variations in RCA isoforms contribute to stress adaptation.
- Findings provide new insights into the multifaceted functions of RCA in plants.
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