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Genome sequence of the cultivated cotton Gossypium arboreum. | LitMetric

AI Article Synopsis

  • The cotton genome is complex (AADD; 2n = 52), making research difficult, but the Gossypium arboreum (AA; 2n = 26) genome was sequenced and assembled as a contributor to the A subgenome.
  • A substantial clean sequence of 193.6 Gb was generated, allowing for 90.4% of the genome to be organized into 13 pseudochromosomes, with 68.5% consisting of repetitive DNA.
  • The study identified 41,330 protein-coding genes and revealed shared whole-genome duplications between G. arboreum and Gossypium raimondii, highlighting the importance of certain genes in cotton disease resistance

Article Abstract

The complex allotetraploid nature of the cotton genome (AADD; 2n = 52) makes genetic, genomic and functional analyses extremely challenging. Here we sequenced and assembled the Gossypium arboreum (AA; 2n = 26) genome, a putative contributor of the A subgenome. A total of 193.6 Gb of clean sequence covering the genome by 112.6-fold was obtained by paired-end sequencing. We further anchored and oriented 90.4% of the assembly on 13 pseudochromosomes and found that 68.5% of the genome is occupied by repetitive DNA sequences. We predicted 41,330 protein-coding genes in G. arboreum. Two whole-genome duplications were shared by G. arboreum and Gossypium raimondii before speciation. Insertions of long terminal repeats in the past 5 million years are responsible for the twofold difference in the sizes of these genomes. Comparative transcriptome studies showed the key role of the nucleotide binding site (NBS)-encoding gene family in resistance to Verticillium dahliae and the involvement of ethylene in the development of cotton fiber cells.

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Source
http://dx.doi.org/10.1038/ng.2987DOI Listing

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