A Genome-Scale Analysis of the PIN Gene Family Reveals Its Functions in Cotton Fiber Development

The PIN-FORMED(PIN) protein,the most important polar auxin transporter,plays a critical role in the distribution of auxin and controls multiple biological processes.However,characterizations and functions of this gene family have not been identified in cotton.Here,we identified the PIN gene family in Gossypium hirsutum,G.arboreum and G.raimondii.This gene family was divided into seven subgroups.A chromosomal distribution analysis showed that GhPIN genes were evenly distributed in eight chromosomes and that the whole genome and dispersed duplications were the main duplication events for GhPIN expansion.qRT-PCR analysis showed a tissue-specific expression pattern for GhPIN.Likely due to the cis-element variations in their promoters,transcripts of PIN6 and PIN8 genes from the At(tetraploid genome orginated from G.arboreum) subgenome and PIN1 a from the Dt(tetraploid genome orginated from G.raimondii) subgenome in G.hirsutum was significantly increased compared with the transcripts in the diploids.The differentia...The PIN-FORMED(PIN) protein,the most important polar auxin transporter,plays a critical role in the distribution of auxin and controls multiple biological processes.However,characterizations and functions of this gene family have not been identified in cotton.Here,we identified the PIN gene family in Gossypium hirsutum,G.arboreum and G.raimondii.This gene family was divided into seven subgroups.A chromosomal distribution analysis showed that GhPIN genes were evenly distributed in eight chromosomes and that中国农学会棉花分会