Gene Modules Co-regulated with Biosynthetic Gene Clusters for Allelopathy between Rice and Barnyardgrass

Area of Science:

• Plant biology
• Genomics
• Biochemistry

Background:

• Allelopathy, driven by allelochemicals, significantly impacts crop-weed interactions.
• The genetic basis for allelochemical biosynthesis and its regulation is largely unknown.
• Gene clustering and regulatory modules are hypothesized to control allelochemical production.

Purpose of the Study:

• Investigate gene clusters and regulatory networks in rice and barnyardgrass allelopathic interactions.
• Identify novel gene clusters and transcription factors involved in allelochemical biosynthesis.
• Elucidate regulatory mechanisms governing allelopathic responses.

Main Methods:

• Transcriptome analysis of mono- and co-cultured rice and barnyardgrass.
• Identification and characterization of gene clusters.
• Gene network construction and analysis of co-expression patterns.
• Identification of hub transcription factors and regulatory genes.

Main Results:

• Discovered three potential new gene clusters in barnyardgrass, including one for quercetin biosynthesis.
• Identified a gene regulatory module with hub transcription factors co-regulated with momilactone A and phytocassane clusters in rice.
• Found gene modules and hub genes co-expressed with the 2,4-dihydroxy-7-methoxy-1,4-benzoxazin-3-one (DIMBOA) biosynthesis cluster in barnyardgrass.
• Identified three indole-3-glycerolphosphate synthase genes regulating DIMBOA cluster expression in barnyardgrass.

Conclusions:

• Uncovered novel insights into the genomic regulation of allelopathic interactions between rice and barnyardgrass.
• Highlighted the role of gene clusters and regulatory modules in mediating allelochemical biosynthesis.
• Findings have potential applications for developing strategies for weed management in agriculture.