Leaf primordium size specifies leaf width and vein number among row-type classes in barley

Area of Science:

• Plant genetics
• Crop science
• Molecular biology

Background:

• Improving crop yield is crucial for global food security.
• Understanding genetic factors influencing plant development is key to crop improvement.
• The Six-rowed spike 1 (VRS1) gene is known for its role in barley spike development.

Purpose of the Study:

• To investigate the role of the VRS1 gene beyond spike development.
• To identify genes impacting leaf blade area (LA) in barley.
• To explore the relationship between leaf development and grain number.

Main Methods:

• Genome-wide association scan in a diverse barley collection.
• Phenotypic analysis of leaf traits in mutant and wild-type barley.
• Histological and gene expression analysis of leaf primordia.
• Transcriptome analysis of leaf primordia.

Main Results:

• The VRS1 gene was identified as a significant factor in leaf blade area.
• Mutant vrs1 barley exhibited increased leaf width, more longitudinal veins, and higher leaf nitrogen.
• VRS1 influences leaf primordia size by affecting cell proliferation.
• A link was validated between the vrs1 locus, wider leaves, and increased grain number.

Conclusions:

• VRS1 plays an independent role in barley leaf development.
• The genetic regulation of leaf development by VRS1 may impact grain number.
• This finding provides insights for enhancing barley yield through genetic manipulation.