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A telomere-to-telomere genome assembly for Cyperus difformis
Jingbo Li1, Jian Zhao2, Wei Zheng3
1Engineering Research Center for Salt- and Alkali-Tolerant Food Crop Seeds of Guangxi Zhuang Autonomous Region, Guangxi Vocational University of Agriculture, Nanning, 530000, China.
A high-quality genome assembly for Cyperus difformis, a problematic rice weed, was generated. This resource aids in understanding herbicide resistance mechanisms and C. difformis evolution.
Area of Science:
- Genomics
- Plant Science
- Agricultural Science
Background:
- Cyperus difformis is a major weed in rice cultivation, causing significant yield losses.
- Rapid evolution of herbicide resistance in C. difformis complicates weed management strategies.
Purpose of the Study:
- To generate a high-quality, telomere-to-telomere genome assembly of Cyperus difformis.
- To provide a foundational genomic resource for understanding herbicide resistance and C. difformis biology.
Main Methods:
- Utilized a combination of PacBio HiFi, Oxford Nanopore Technologies (ONT), MGI short reads, and high-throughput chromatin conformation capture (Hi-C).
- Anchored contigs to chromosomes using Hi-C data and defined telomeres.
Main Results:
- Assembled a 226 Mb genome with a scaffold N50 of 13.08 Mb.
- Anchored 97.24% of contigs to 18 chromosomes and identified 35 telomeres.
- Annotated 19,347 protein-coding genes (91.8%) and characterized repetitive sequences.
Conclusions:
- The telomere-to-telomere genome assembly of C. difformis is a valuable resource.
- Facilitates research in population genetics, comparative genomics, and the evolution of herbicide resistance in this key weed species.
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