Abstract
TCP proteins are plant-specific transcription factors implicated to perform a variety of physiological functions during plant growth and development. In the current study, we performed for the first time the comprehensive analysis of TCP gene family in a diploid cotton species, Gossypium arboreum, including phylogenetic analysis, chromosome location, gene duplication status, gene structure and conserved motif analysis, as well as expression profiles in fiber at different developmental stages. Our results showed that G. arboreum contains 36 TCP genes, distributing across all of the thirteen chromosomes. GaTCPs within the same subclade of the phylogenetic tree shared similar exon/intron organization and motif composition. In addition, both segmental duplication and whole-genome duplication contributed significantly to the expansion of GaTCPs. Many these TCP transcription factor genes are specifically expressed in cotton fiber during different developmental stages, including cotton fiber initiation and early development. This suggests that TCP genes may play important roles in cotton fiber development.
Highlights
TCP proteins constitute a family of plant-specific transcription factors widely distributed in angiosperms[1,2]
The recent availability of G. arboreum genome sequences[17] allowed us to perform a comprehensive analysis of this family in cotton, including phylogenetic analysis, chromosome location, gene duplication status, gene structure and conserved motif analysis, as well as tissue specific expression profiles
The G. arboreum genome contains almost the same number of TCP genes as in G. raimondii[18] and have more than 50% more than in Arabidopsis[2], which is in consistency with the number of protein coding genes in each species[17,24,25]
Summary
TCP proteins constitute a family of plant-specific transcription factors widely distributed in angiosperms[1,2]. Evidences indicated that TCP proteins play a significant role in fiber development[13,14], which makes it necessary to identify and characterize TCP family members in cotton, one of the most important economic crops and natural fiber sources all over the world[15]. Cotton comprises both diploid and tetraploid species, belonging to the Gossypium genus. Only two TCP family members have been functionally characterized in cotton, suggesting that TCP genes may play key roles in fiber development[13,14]. The recent completion of the sequencing of G. arboreum genome allowed us to characterize all cotton TCP genes
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