The transcription factor LF1 controls compound leaf development by interacting with GmTCP3 and the GmLFY signaling...

Area of Science:

• Plant Biology
• Genetics
• Molecular Biology

Background:

• Leaf morphology and compound leaf development are crucial for plant architecture but poorly understood in soybeans.
• Soybean cultivars exhibit significant variation in leaflet number, ranging from trifoliolate to five-leaflet structures.

Purpose of the Study:

• To identify the genetic regulators controlling leaflet number variation in soybeans.
• To elucidate the molecular mechanisms underlying soybean compound leaf development.

Main Methods:

• Genetic mapping to identify key genes.
• Gene expression analysis in leaf tissues.
• Transgenic approaches to study gene function (overexpression).
• CRISPR-Cas9 gene editing.
• Protein interaction assays.
• Analysis of cis-element binding and gene induction.

Main Results:

• The AP2/ERF transcription factor LF1 was identified as a key regulator of leaflet number.
• LF1 expression is localized to leaf initiation sites and directly influences leaflet development.
• LF1 exhibits negative autoregulation and interacts with GmTCP3.
• CRISPR editing of GmTCP3 affects leaf margin and leaflet number.
• LF1 positively regulates the expression of GmLFY, a known leaflet development regulator.

Conclusions:

• LF1 is a central regulator of soybean leaflet morphogenesis.
• LF1's interactions with GmTCP3 and GmLFY provide novel insights into the genetic control of compound leaf development.
• Understanding these genetic pathways can inform strategies for modifying soybean plant architecture.