Multi-Time Point Transcriptome Analysis and Functional Validation Revealed Bol4CL41 Negatively Regulates Black Rot...

Area of Science:

• Plant molecular biology
• Plant pathology
• Genomics

Background:

• 4-coumarate-CoA ligase (4CL) is vital for plant growth and stress responses via the phenylpropanoid pathway.
• Black rot, caused by Xanthomonas campestris pv. campestris (Xcc), severely impacts cruciferous crops like cabbage.
• The specific role of 4CL genes in cabbage's defense against black rot is not well understood.

Purpose of the Study:

• To investigate the function of 4CL genes in cabbage resistance to black rot.
• To identify key 4CL genes involved in the plant's response to Xcc infection.
• To elucidate the molecular mechanisms of black rot resistance in cabbage.

Main Methods:

• Transcriptome sequencing of resistant and susceptible cabbage varieties post-inoculation.
• KEGG pathway analysis to identify enriched metabolic pathways.
• Genome-wide analysis of the Bol4CL gene family, including gene structure and protein motif analysis.
• Functional validation of a candidate gene (Bol4CL41) through overexpression in transgenic cabbage.

Main Results:

• The phenylpropanoid biosynthesis pathway was significantly enriched in response to Xcc infection.
• Forty-three Bol4CL gene family members were identified in the cabbage genome.
• Bol4CL41 was identified as a key gene, with its overexpression leading to larger lesion areas and increased susceptibility to black rot.
• Bol4CL41 negatively regulates cabbage resistance to black rot.

Conclusions:

• Bol4CL41 plays a crucial role in negatively regulating cabbage resistance to black rot.
• Understanding the Bol4CL gene family's function provides insights into plant disease resistance mechanisms.
• This study offers experimental evidence for the mechanisms of black rot resistance in cabbage.