Sequencing of allotetraploid cotton (Gossypium hirsutum L. acc. TM-1) provides a resource for fiber improvement

By Tianzhen Zhang, Yan Hu, Wenkai Jiang, Lei Fang, Xueying Guan, Jiedan Chen, Jinbo Zhang, C. Saski, B. Scheffler, D. Stelly and 44 more. Nature Biotechnology, 2015

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Upland cotton is a model for polyploid crop domestication and transgenic improvement. Here we sequenced the allotetraploid Gossypium hirsutum L. acc. TM-1 genome by integrating whole-genome shotgun reads, bacterial artificial chromosome (BAC)-end sequences and genotype-by-sequencing genetic maps. We assembled and annotated 32,032 A-subgenome genes and 34,402 D-subgenome genes. Structural rearrangements, gene loss, disrupted genes and sequence divergence were more common in the A subgenome than in the D subgenome, suggesting asymmetric evolution. However, no genome-wide expression dominance was found between the subgenomes. Genomic signatures of selection and domestication are associated with positively selected genes (PSGs) for fiber improvement in the A subgenome and for stress tolerance in the D subgenome. This draft genome sequence provides a resource for engineering superior cotton lines.

Subfields: Endocrinology, Plant Science

View Paper: https://www.semanticscholar.org/paper/6382a9688b96aeffa381c370e1ef49024f56df5f

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