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Beta-amylase gene variability in introgressive wheat lines.

Maksym Antonyuk1, Anastasiia Navalikhina1, Tamara Ternovska2

  • 1National University of Kyiv-Mohyla Academy, 2 Skovorody vul., Kyiv, 04655, Ukraine.

Journal of Applied Genetics
|August 27, 2016
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Summary

Miniature Inverted-Repeat Transposable Elements (MITEs) cause variation in bread wheat beta-amylase genes. Their location differs between wheat species, and MITEs are lost in allopolyploids due to genomic shock.

Keywords:
Artificial amphidiploidsBread wheatGenomic shockMITETransposons

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Area of Science:

  • Plant Genetics
  • Molecular Biology
  • Genomics

Background:

  • Beta-amylase is a crucial enzyme in starch metabolism in plants.
  • Transposable elements, including Miniature Inverted-Repeat Transposable Elements (MITEs), are known to influence gene evolution and function.
  • Understanding gene variability in bread wheat (Triticum aestivum L.) is vital for crop improvement.

Purpose of the Study:

  • To analyze the variability of the beta-amylase gene in bread wheat and related species.
  • To identify the role of MITEs in beta-amylase gene variation.
  • To investigate the impact of allopolyploidization on MITE sequences in wheat.

Main Methods:

  • Comparative sequence analysis of beta-amylase genes from various Triticeae species.
  • Identification and characterization of MITE sequences within the beta-amylase gene.
  • Analysis of MITE presence and loss in artificial amphidiploids and introgression lines.

Main Results:

  • MITEs were identified in the beta-amylase gene of Triticum urartu and T. aestivum L., located in the third intron.
  • A low sequence identity was observed between MITEs from Aegilops comosa (fourth intron) and T. aestivum.
  • The artificial amphidiploid Miosa, derived from Ae. comosa, showed a complete loss of MITE sequences.

Conclusions:

  • MITEs contribute to the variability of the beta-amylase gene in bread wheat.
  • The location of MITEs within the beta-amylase gene differs across Triticeae species.
  • Allopolyploidization may induce genomic shock, leading to the loss of MITE sequences.