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Detecting Genetic Mobility Using a Transposon-Based Marker System in Gamma-Ray Irradiated Soybean Mutants.

Nguyen Ngoc Hung1,2, Dong-Gun Kim1,3, Jae Il Lyu1

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Plants (Basel, Switzerland)
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Transposable elements (TEs) mobility in soybean mutants was assessed using the TE-TRAP technique. Miniature inverted-repeat transposable elements (MITEs) showed higher mobility than PONG elements, aiding in mutant selection.

Keywords:
TE-TRAPgamma raymutation breedingsoybeantransposable element

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Area of Science:

  • Genomics
  • Molecular Biology
  • Plant Breeding

Background:

  • Transposable elements (TEs) are mobile DNA sequences crucial for genome evolution.
  • Investigating TE mobility is key to understanding genome diversification and crop improvement.
  • Soybean (Glycine max) is a vital legume crop, and understanding its genome dynamics is important.

Purpose of the Study:

  • To develop and apply a simple, rapid method (TE-TRAP) for assessing TE mobility in soybean.
  • To compare the mobility of different transposable elements (PONG, MITE-Tourist, MITE-Stowaway) in gamma-irradiated soybean mutants.
  • To evaluate the utility of TE-TRAP markers for genetic diversity analysis and mutant selection in soybean breeding.

Main Methods:

  • Utilized consensus terminal inverted repeat sequences of PONG, MITE-Tourist (M-t), and MITE-Stowaway (M-s) as TE-TRAP markers.
  • Applied TE-TRAP to a gamma-irradiated soybean mutant pool to analyze transposable element mobility.
  • Quantified polymorphism levels and polymorphism information content (PIC) for different primer combinations.

Main Results:

  • TE-TRAP markers revealed an average polymorphism level of 57.98% and PIC of 0.14.
  • MITE markers (M-t and M-s) demonstrated higher intra-mutant population variation (82% and 80%) compared to PONG (71%).
  • MITE markers indicated more dynamic and active transposable element mobility than the PONG marker in irradiated soybean lines.

Conclusions:

  • The TE-TRAP technique, particularly with MITEs, is effective for investigating genetic diversity and TE mobilization in soybean.
  • This method provides valuable tools for selecting desirable mutants in soybean mutation breeding programs.
  • The findings highlight the differential mobility of TEs and their potential impact on soybean genome evolution and breeding.