Flowering Initiation Genes Determine the Node for Inflorence-Ear in Zea Mays L

Area of Science:

• Plant Molecular Biology
• Maize Genetics
• Flowering Time Regulation

Background:

• Flowering initiation in plants is a complex process regulated by various genes.
• Understanding the precise timing and genetic control of flowering is crucial for crop improvement.

Purpose of the Study:

• To investigate the expression profiles of key flowering initiation genes in Zea mays L.
• To determine the temporal dynamics of gene expression in reproductive and adjacent nodes during flowering.

Main Methods:

• Gene expression analysis of ID1, DLF1, ZCN6, ZCN7, and ZCN8 in leaf axils.
• Comparison of gene expression between reproductive and adjacent nodes during flowering initiation.

Main Results:

• Similar inter-node expression dynamics observed for ID1, DLF1, ZCN7, and ZCN8 throughout the measurement period.
• Significant upregulation of flowering activator genes (ID1, DLF1, ZCN7, ZCN8) in reproductive nodes approximately 10 days before visual detection of the inflorescence meristem.
• Marked decrease in flowering inhibitor gene ZCN6 expression to minimal levels across all nodes.

Conclusions:

• The study identifies a critical 10-day window preceding visual flowering detection for significant shifts in key gene expression.
• Upregulation of specific flowering activator genes and downregulation of an inhibitor gene correlate with flowering initiation in maize.
• These findings provide insights into the molecular mechanisms governing flowering time in Zea mays L.