A chromosome-scale draft sequence of the Canada fleabane genome

Area of Science:

• Agricultural Science
• Genomics
• Plant Science

Background:

• Genomics technologies are increasingly accessible for agricultural pest research.
• The International Weed Genome Consortium promotes sequencing projects for various weed species.
• Chromosome-scale genome sequences are crucial for advanced genetic and genomic studies.

Purpose of the Study:

• To generate a chromosome-scale genome assembly for Conyza canadensis (Canadian horseweed).
• To identify genes associated with herbicide resistance in Conyza canadensis.
• To establish Conyza canadensis as a model organism for studying weed biology and resistance.

Main Methods:

• Utilized third-generation sequencing technology for genome assembly.
• Assembled a 426-megabase genome with nine chromosome-scale scaffolds covering over 98% of the sequence.
• Annotated the genome, focusing on genes linked to herbicide resistance.

Main Results:

• A high-quality, chromosome-scale genome assembly for Conyza canadensis was produced.
• Identified numerous genes associated with herbicide resistance, including ABC-type transporters (159), cytochrome P450s (352), and glycosyltransferases (181).
• The genome assembly provides a foundation for genetic and genomic research in this weed species.

Conclusions:

• Conyza canadensis possesses a small, syntenic genome within the Asteraceae family, a short life cycle, and ease of crossing.
• The chromosome-scale genome sequence positions Conyza canadensis as a potential model species for weed research.
• This genomic resource can drive a paradigm shift in studying non-target site herbicide resistance mechanisms.