Abstract：
:Auxin response factors (ARFs) are recently discovered transcription factors that bind with auxin response elements (AuxRE, TGTCTC) to regulate the expression of early auxin-responsive genes. To our knowledge, the ARF gene family has never been characterized in cotton, the most important fiber crop in the world. In this study, a total of 35 ARF genes, named as GrARFs, were identified in a diploid cotton species Gossypium raimondii. The 35 ARF genes were located in 12 of the 13 cotton chromosomes; the intron/exon distribution of the GrARF genes was similar among sister pairs, whereas the divergence of some GrARF genes suggests the possibility of functional diversification. Our results show that the middle domains of nine GrARF proteins rich in glutamine (Q) are activators, while 26 other GrARF proteins rich in proline (P), serine (S), and threonine (T) are repressors. Our results also show that the expression of GrARF genes is diverse in different tissues. The expression of GrARF1 was significantly higher in leaves, whereas GrARF2a had higher expression level in shoots, which implicates different roles in the tested tissues. The GrARF11 has a higher expression level in buds than that in leaves, while GrARF19.2 shows contrasting expression patterns, having higher expression in leaves than that in buds. This suggests that they play different roles in leaves and buds. During long-term evolution of G. raimondii, some ARF genes were lost and some arose. The identification and characterization of the ARF genes in G. raimondii elucidate its important role in cotton that ARF genes regulate the development of flower buds, sepals, shoots, and leaves.
journal_name
Funct Integr Genomicsjournal_title
Functional & integrative genomicsauthors
Sun R,Wang K,Guo T,Jones DC,Cobb J,Zhang B,Wang Qdoi
10.1007/s10142-015-0437-0subject
Has Abstractpub_date
2015-07-01 00:00:00pages
481-93issue
4eissn
1438-793Xissn
1438-7948journal_volume
15pub_type
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