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Agrobacterium-Mediated Virus-Induced Gene Silencing Assay In Cotton
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Recombinase-mediated gene stacking in cotton.

Yamei Li1,2, Ruyu Li1, Zhiguo Han1

  • 1Plant Gene Engineering Center, Key Laboratory of South China Agricultural Plant Molecular Analysis and Genetic Improvement, Provincial Key Laboratory of Applied Botany, South China Botanical Garden, Chinese Academy of Sciences, Guangzhou 510650, China.

Plant Physiology
|January 28, 2022
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Summary

Researchers developed specific cotton lines for efficient gene stacking using recombinase technology. This method precisely integrates multiple genes, accelerating the development of improved crop varieties with traits like disease resistance.

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Area of Science:

  • Plant Biotechnology
  • Molecular Genetics
  • Crop Science

Background:

  • Site-specific gene stacking offers an efficient method for transgene introgression in crops.
  • Recombinase-mediated gene stacking requires specific recognition sites within the plant genome.
  • Developing suitable target lines is crucial for successful recombinase-mediated gene stacking in cotton (Gossypium hirsutum).

Purpose of the Study:

  • To develop and characterize cotton target lines for Mycobacteriophage Bxb1 recombinase-mediated gene stacking.
  • To evaluate the efficiency of site-specific gene stacking for introducing verticillium wilt resistance genes.
  • To establish foundation lines for precise DNA integration in cotton breeding.

Main Methods:

  • Empirical screening of random insertion events to identify cotton target lines with specific recombinase recognition sites (RS2, lox, attP).
  • Transformation of cotton with candidate genes for verticillium wilt resistance into developed target lines (CTS1, CTS3, CTS4).
  • Confirmation of site-specific integration using Southern blot and DNA sequencing, and assessment of disease resistance.

Main Results:

  • Several cotton target lines containing single, intact copies of the target construct with precise recognition sites were identified.
  • These lines exhibited good expression of the reporter gene (gfp) and lacked insertion near genes or centromeres.
  • Nine site-specific integration events were achieved, and one regenerated plant (CTS1i3) showed resistance to verticillium wilt.

Conclusions:

  • The developed cotton target lines are suitable for recombinase-mediated gene stacking.
  • This approach facilitates precise and efficient integration of multiple genes into the cotton genome.
  • These lines serve as valuable resources for accelerating the development of improved cotton cultivars with desirable traits.