Evolution of cereal floral architecture and threshability

Area of Science:

• Agricultural Science
• Plant Biology
• Genetics

Background:

• Hulled grains possess natural seed protection via tightly enclosing glumes, complicating manual threshing.
• Gramineous crops have developed diverse hull-like floral organs through evolution and domestication.
• Recent advances include identifying genes linked to cereal threshability and regulatory modules for hull development.

Purpose of the Study:

• To review morphological similarities, key regulators, and common mechanisms of easy-threshing traits in crops.
• To explore convergent evolution in cereals regarding threshability.
• To assess the potential for de novo domestication of wild cereals using genome editing.

Main Methods:

• Literature review focusing on morphological, genetic, and mechanistic aspects of cereal threshability.
• Comparative analysis of hull-like floral organ development across different gramineous species.
• Synthesis of current knowledge on genes and regulatory pathways controlling threshability.

Main Results:

• Identification of shared and unique features in the developmental processes of cereal threshability.
• Elucidation of common regulatory modules governing hull-like floral organ specification.
• Highlighting the role of specific domesticated genes in improving crop threshability.

Conclusions:

• Understanding cereal threshability mechanisms offers insights into convergent evolution.
• Genome-editing technologies can be leveraged for the de novo domestication of wild cereal germplasm.
• This research facilitates crop improvement by targeting key genetic pathways for enhanced threshability.