Leaf angle regulation toward a maize smart canopy.

Area of Science:

• Plant Genetics and Breeding
• Agronomy
• Molecular Biology

Background:

• Dense planting in maize increases yield, but requires optimized plant architecture for light penetration.
• Leaf angle is a critical trait for canopy light interception and photosynthetic efficiency, defining plant architecture.
• Developing maize with a 'smart canopy' involves regulating leaf angles for optimal light distribution.

Purpose of the Study:

• To review the relationship between maize polarity axes and leaf angle formation.
• To summarize advances in mutant and quantitative genetics of maize leaf angle.
• To highlight the role of transcription factors in regulating maize leaf angle.

Main Methods:

• Review of existing literature on maize leaf angle genetics and plant architecture.
• Analysis of mutant and quantitative genetic studies.
• Examination of the biological implications of key regulatory genes and pathways.

Main Results:

• Identified transcription factors, particularly the KNOX family, are essential for establishing the blade-sheath boundary.
• Brassinosteroid pathway components and the regulator ZmRAVL1 act as central hubs in the genetic hierarchy controlling leaf angle.
• Established the link between polarity axes and leaf angle development in maize.

Conclusions:

• Leaf angle regulation is a key strategy for breeding maize varieties with ideal canopy ideotypes.
• Understanding the genetic underpinnings provides avenues for manipulating leaf angles across different canopy layers.
• Targeting specific transcription factors and pathways can lead to improved crop yields through enhanced light utilization.