Wheat TaSPL13-2B Improves Floret Fertility and Enhances Grain Number per Spikelet Through Jasmonic Acid Signalling...

Area of Science:

• Plant Biology
• Agricultural Science
• Genetics

Background:

• Floret fertility significantly impacts cereal crop yield, particularly in wheat.
• Understanding the molecular mechanisms regulating floret fertility is crucial for crop improvement.
• Phytohormone signaling and transcription factors play complex roles in floret and spikelet development.

Purpose of the Study:

• To elucidate the role of jasmonic acid (JA) in regulating wheat floret fertility.
• To identify key genes and regulatory pathways involved in JA-mediated floret development.
• To explore the potential of targeting JA signaling for enhancing wheat yield.

Main Methods:

• Identification and characterization of JA-responsive genes in wheat.
• Analysis of gene expression patterns related to JA signaling and biosynthesis.
• Investigating the regulatory interactions between transcription factors and JA pathway components.
• Field trials to assess the impact of TaSPL13-2B on wheat yield.

Main Results:

• TaSPL13-2B, a JA-responsive regulator, was identified to improve floret fertility.
• TaSPL13-2B directly represses TaJAZ1, a key JA signaling factor, enhancing floret and grain number.
• The TaSPL13-2B/TaJAZ1 module influences floret development by regulating TaMADS1 expression and JA biosynthesis.
• Field trials confirmed TaSPL13-2B as a viable target for increasing wheat yield.

Conclusions:

• Jasmonic acid signaling is a critical regulator of wheat floret fertility.
• The TaSPL13-2B gene acts as a key node in the JA pathway to promote floret fertility.
• Enhancing floret fertility through manipulation of JA signaling pathways presents a promising strategy for boosting wheat production.