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MdbHLH3 modulates apple soluble sugar content by activating phosphofructokinase gene expression
Jian-Qiang Yu1, Kai-Di Gu1, Li-Li Zhang1
1National Key Laboratory of Crop Biology, College of Horticulture Science and Engineering, Shandong Agricultural University, Tai'an, 271018, China.
Journal of Integrative Plant Biology
|February 24, 2022
Summary
A key gene, MdPFPβ, enhances sugar accumulation in apples by boosting photosynthesis and metabolism. A transcription factor, MdbHLH3, activates this gene, improving fruit quality and carbohydrate allocation.
Area of Science:
- Plant Biology
- Biochemistry
- Genetics
Background:
- Soluble sugars are crucial for plant growth, fruit quality, and signaling.
- Understanding soluble sugar accumulation mechanisms is vital for fruit development.
Purpose of the Study:
- To investigate the role of MdPFPβ in soluble sugar accumulation in apples.
- To identify regulatory factors controlling MdPFPβ expression and its impact on fruit metabolism.
Main Methods:
- Biochemical analysis of gene expression and protein interactions.
- Gene expression studies in apple and tomato.
- Analysis of photosynthetic performance and enzyme activities.
Main Results:
- MdPFPβ enhances soluble sugar accumulation by improving photosynthesis and sugar-metabolizing enzyme activity.
- The bHLH transcription factor MdbHLH3 binds to the MdPFPβ promoter, activating its expression.
- Overexpression of MdPFPβ in tomato affects photosynthesis and carbon metabolism.
- MdbHLH3 activates MdPFPβ, increasing photosynthetic rates and sugar accumulation in apple.
Conclusions:
- MdbHLH3 regulates soluble sugar accumulation in apple leaves and fruit by activating MdPFPβ.
- This mechanism coordinates carbohydrate allocation, impacting overall plant metabolism and fruit quality.
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