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Fine-tuning sugar content in strawberry.

Sinian Xing1, Kunling Chen1, Haocheng Zhu1,2

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|September 5, 2020
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Summary

Strawberry (Fragaria vesca) gene editing enhanced sugar content using base editor A3A-PBE. This method rapidly improved quantitative traits for desirable fruit phenotypes.

Keywords:
Asexually reproducing cropsBasic leucine zipperFine-tuningQuantitative trait variationStrawberrySugar contentUpstream open reading frame

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Area of Science:

  • Plant Biology
  • Genetics
  • Biotechnology

Background:

  • Quantitative traits, like sugar content in strawberries (Fragaria vesca), are crucial for fruit quality but challenging to fine-tune.
  • The upstream open reading frame (uORF) is a conserved regulatory element with potential for precise genetic modification.

Purpose of the Study:

  • To engineer novel alleles of the FvebZIPs1.1 uORF in strawberry using base editing.
  • To assess the impact of these engineered alleles on sugar content and other fruit phenotypes.

Main Methods:

  • Utilized the base editor A3A-PBE for targeted mutagenesis of the FvebZIPs1.1 uORF in Fragaria vesca.
  • Generated homozygous T1 mutant lines and screened for transgene-free mutants with novel genotypes.
  • Quantified sugar content and evaluated the stability of novel genotypes across generations.

Main Results:

  • Generated seven novel alleles of the FvebZIPs1.1 uORF.
  • Achieved significant increases in sugar content, ranging from 33.9% to 83.6% in homozygous T1 mutant lines compared to wild-type.
  • Recovered 35 novel transgene-free genotypes exhibiting a continuum of sugar content.
  • Demonstrated that novel genotypes can be rapidly fixed in subsequent generations via asexual reproduction.

Conclusions:

  • Genome editing of uORFs provides an effective strategy for enhancing quantitative traits in plants.
  • The combination of base editing and asexual reproduction offers a powerful approach for rapid crop improvement, specifically for traits like fruit sugar content in strawberries.
  • This study highlights the potential of precise genetic engineering for developing improved crop varieties with desirable commercial characteristics.