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Sucrose synthase 3 improves fruit quality in grape.

Ting Huang1, Ting Zheng2, Pingjing Hong3

  • 1College of Agriculture, Guangxi University, No. 100, Daxue Road, Nanning, Guangxi, 530004, China.

Plant Physiology and Biochemistry : PPB
|February 11, 2025
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Summary
This summary is machine-generated.

Sucrose synthase (SS) interacts with VvSnRK1β to regulate sugar accumulation in grapes. ABA influences this interaction, affecting fruit quality and sugar content.

Keywords:
ABAGrapesTransgeneVvSS3VvSnRK1β

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Area of Science:

  • Plant Physiology
  • Biochemistry
  • Molecular Biology

Background:

  • Sucrose synthase (SS) is crucial for plant sugar metabolism and fruit quality.
  • Previous work identified an interaction between VvSS3 and VvSnRK1β.

Purpose of the Study:

  • To investigate the role of VvSS3 in sugar metabolism and its interaction with VvSnRK1β.
  • To elucidate the impact of ABA on VvSS3 activity and sugar accumulation.

Main Methods:

  • Site-directed mutagenesis to identify key interaction sites.
  • Subcellular localization studies.
  • Analysis of enzyme activity, gene transcription, and metabolite levels in transgenic callus.

Main Results:

  • SS enzyme activity primarily favors sugar decomposition, peaking before veraison.
  • VvSS3 activity correlates positively with ABA concentration.
  • Mutations at VvSS3S176 and VvSS3S381 sites affect SS activity direction and VvSnRK1β transcription.
  • VvSS3 promotes soluble sugar and anthocyanin accumulation, influenced by ABA.

Conclusions:

  • VvSS3 interacts with VvSnRK1β, forming a protein complex that mediates ABA-induced soluble sugar accumulation in grapes.
  • Specific phosphorylation sites on VvSS3 are critical for this interaction and downstream metabolic regulation.