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A molecular framework for grain number determination in barley.

Yongyu Huang1, Roop Kamal1, Nandhakumar Shanmugaraj1

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Barley floral development is regulated by HvCMF4, a gene crucial for light signaling and vascular development. This gene impacts grain production by controlling floral survival and development, offering insights into cereal crop yield.

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Area of Science:

  • Plant Molecular Biology
  • Crop Science
  • Genetics

Background:

  • Flowering plants with indeterminate inflorescences often produce excess floral structures.
  • Understanding the genetic regulation of floral development and grain yield is critical for crop improvement.

Purpose of the Study:

  • To investigate the molecular mechanisms decoupling floral primordia initiation from grain maturation in barley (Hordeum vulgare L.).
  • To identify key genes and pathways regulating floral growth, survival, and their impact on grain production.

Main Methods:

  • Analysis of gene expression patterns, particularly focusing on barley CCT MOTIF FAMILY 4 (HvCMF4) in the inflorescence vasculature.
  • Investigating the effects of HvCMF4 mutations on floral primordia survival, rachis greening, and plastidial energy supply.
  • Exploring the interplay between light signaling, circadian clock, and vascular development in floral growth.

Main Results:

  • Floral primordia initiation in barley is molecularly distinct from grain maturation.
  • HvCMF4 orchestrates floral growth via light signaling, chloroplast development, and vascular programs, impacting primordia survival.
  • HvCMF4 mutations lead to increased primordia death and pollination failure by reducing rachis greening and limiting energy supply.

Conclusions:

  • HvCMF4 acts as a light sensory factor, coordinating floral initiation and survival with the vascular-localized circadian clock.
  • Enhancing both floral primordia number and survival through beneficial HvCMF4 alleles positively impacts barley grain production.
  • Findings provide crucial insights into the molecular basis of grain number determination in cereal crops.