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Population transcriptome and phenotype analyses reveal that Rht-D1b contributed a larger seedling root to modern

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The Green Revolution (GR) significantly altered wheat root systems. A specific GR allele, Rht-D1b, enhanced seedling root growth in modern cultivars by increasing cell size and meristem activity.

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Area of Science:

  • Plant genetics
  • Agricultural science
  • Crop physiology

Background:

  • The Green Revolution (GR) boosted wheat yields but its impact on root systems is unclear.
  • Understanding GR's effects on wheat root architecture is crucial for crop improvement.

Purpose of the Study:

  • To investigate how GR influenced the wheat (Triticum aestivum L.) root system.
  • To identify genetic factors responsible for GR-driven root system changes.

Main Methods:

  • Large-scale transcriptomic and phenotypic analysis of 406 wheat accessions.
  • Comparison of landraces and modern cultivars to identify GR-associated traits.

Main Results:

  • The GR allele Reduced height (Rht)-D1b significantly increased seedling root size in modern cultivars by enhancing cell length and meristem size.
  • Rht-D1b's effect on root systems is linked to the translational reinitiation of TaRht-D1.
  • Unlike Rht-D1b, the Rht-B1b allele did not significantly affect root traits despite similar effects on plant height.

Conclusions:

  • The Rht-D1b allele confers a larger root-shoot ratio in modern wheat cultivars, an overlooked benefit of the Green Revolution.
  • Findings provide insights for utilizing GR alleles to improve wheat's seminal root system.