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Updated: May 15, 2025

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GIBBERELLIN 3-OXIDASE genes regulate height and grain size in bread wheat.

Andrew L Phillips1, Alison K Huttly1, Rocío Alarcón-Reverte1

  • 1Rothamsted Research, Harpenden, Hertfordshire AL5 2JQ, UK.

Journal of Experimental Botany
|April 10, 2025
PubMed
Summary

Gibberellin 3-oxidases (GA3OX) in wheat control growth and grain development. GA3OX2 is vital for plant growth, while GA3OX3 and GA1OX1 influence grain size by modulating gibberellin levels.

Keywords:
GA 3-oxidasegenetic diversitygibberellingrain sizeheightwheat

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Area of Science:

  • Plant Biology
  • Molecular Genetics
  • Agricultural Science

Background:

  • Gibberellin (GA) biosynthesis is crucial for plant growth and development.
  • GA 3-oxidases (GA3OX) are key enzymes in GA biosynthesis, converting precursors to bioactive GAs.
  • Understanding GA regulation in crops like wheat (Triticum aestivum L.) is essential for yield improvement.

Purpose of the Study:

  • To characterize the roles of seven GA3OX homologues in bread wheat.
  • To investigate the impact of GA3OX gene variation on plant development and grain characteristics.
  • To identify potential targets for enhancing wheat breeding through GA pathway manipulation.

Main Methods:

  • Gene characterization of seven GA3OX homologues in wheat.
  • Analysis of mutant phenotypes (ga3ox2, ga3ox3, ga1ox1) for altered GA levels and developmental traits.
  • Association studies of natural variation in GA3OX3-B1 and GA1OX1-B1 with grain size and weight.

Main Results:

  • GA3OX2 is essential for normal wheat growth and fertility, with mutants showing severe dwarfism and infertility due to low bioactive GA.
  • Mutations in GA3OX3 reduce grain size and weight by lowering bioactive GA levels in grains.
  • Mutations in GA1OX1 increase bioactive GA levels in grains, leading to larger grains; alleles of GA3OX3 and GA1OX1 also unexpectedly affect plant height.
  • Natural variation in GA3OX3-B1 and GA1OX1-B1 is linked to grain size, with evidence of selection for larger grain haplotypes during breeding.

Conclusions:

  • The wheat GA3OX gene family exhibits diversified functions, with GA3OX2 critical for overall plant development and GA3OX3/GA1OX1 specifically modulating GA levels during grain development.
  • Variation within GA3OX genes, particularly GA3OX3 and GA1OX1, offers opportunities for improving wheat grain yield and quality.
  • Targeting GA biosynthetic pathways presents a promising strategy for future wheat breeding programs.