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  1. Home
  3. Whole-genome Sequencing Of Allotetraploid Bermudagrass Reveals The Origin Of Cynodon And Candidate Genes For Salt Tolerance
  1. Home
  3. Whole-genome Sequencing Of Allotetraploid Bermudagrass Reveals The Origin Of Cynodon And Candidate Genes For Salt Tolerance

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Whole-genome sequencing of allotetraploid bermudagrass reveals the origin of Cynodon and candidate genes for salt

Huan Wang1,2, Tilin Fang3, Xiaoning Li4

  • 1College of Grassland Science, Qingdao Agricultural University, Qingdao City, Shandong Province, 266109, China.

The Plant Journal : for Cell and Molecular Biology
|March 26, 2024

View abstract on PubMed

Summary
This summary is machine-generated.

We sequenced the bermudagrass genome to understand its evolution and identify genes for salt tolerance. Key genes like RAP2-2 were found, offering insights into enhanced salinity resistance in this important turfgrass.

Keywords:
Cynodon dactyloncomparative genomicsgenome assemblypolyploid evolution

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Area of Science:

  • Genomics
  • Plant Biology
  • Evolutionary Biology

Background:

  • Bermudagrass (Cynodon dactylon) is a vital warm-season grass known for salinity and drought tolerance.
  • The evolutionary origins and genetic basis of bermudagrass's salt tolerance remain largely unexplored.

Purpose of the Study:

  • To investigate evolutionary divergence events within the Cynodon genus.
  • To identify specific genes contributing to salinity tolerance in bermudagrass.

Main Methods:

  • Development of a chromosome-level polyploid genome sequence for bermudagrass 'A12359'.
  • Phylogenetic analysis to determine divergence times.
  • Genome-wide association study (GWAS) to identify candidate genes for agronomic traits, including salt resistance.

Main Results:

  • A 604.0 Mb chromosome-level genome sequence for bermudagrass was established, revealing two homoeologous chromosome sets and approximately 30,000 genes.
  • Phylogenetic analysis indicated divergence of Cynodon from Oropetium thomaeum 19.7-25.4 Mya, subgenome divergence 6.3-9.1 Mya, and polyploidization 1.5 Mya in Africa.
  • GWAS identified 82 candidate genes for agronomic traits, with three single-nucleotide polymorphisms strongly associated with salt resistance genes (RAP2-2, CNG channels, F14D7.1).

Conclusions:

  • The study provides a foundational genome sequence for bermudagrass, elucidating its evolutionary history.
  • Identified candidate genes, particularly RAP2-2, CNG channels, and F14D7.1, offer potential targets for enhancing bermudagrass salt tolerance.
  • These genomic resources will advance comparative genomics and breeding efforts for salt-tolerant Cynodon species.