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Cotton is one of the most economically important crops worldwide. Seed size is a vital trait for plants connected with yield and germination.  GW2  encodes a RING_Ubox E3 ubiquitin ligase that controls seed development by affecting cell growth. Here, are few reports on  GW2 -like genes in cotton, and the function of  GW2  in cotton is poorly understood. In the present study, a genome-wide analysis identified 6 and 3  GW2- like genes in each of the two cultivated tetraploids ( Gossypium hirsutum  and  G. barbadense ) and each of their diploid ancestral species ( G. arboreum ,  G. raimondii ), respectively.  GhGW2-2D  has the same functional domain and high sequence similarity with  AtDA2  in  Arabidopsis . Overexpression of  GhGW2-2D  in  Arabidopsis  significantly reduced seed and seedling size, suggesting  GhGW2-2D  is a potential target for regulating cotton seed size. These results provided information on the genetic and molecular basis of  GW2 -like genes in cotton, thus establishing a foundation for functional studies of cotton seeds.

Genome-Wide Analysis of the GW2-Like Genes in Gossypium and Functional Characterization of the Seed Size Effect of GhGW2-2D