Abstract
TCP proteins are plant-specific transcription factors (TFs), and perform a variety of physiological functions in plant growth and development. In this study, 74 non-redundant TCP genes were identified in upland cotton (Gossypium hirsutum L.) genome. Cotton TCP family can be classified into two classes (class I and class II) that can be further divided into 11 types (groups) based on their motif composition. Quantitative RT-PCR analysis indicated that GhTCPs display different expression patterns in cotton tissues. The majority of these genes are preferentially or specifically expressed in cotton leaves, while some GhTCP genes are highly expressed in initiating fibers and/or elongating fibers of cotton. Yeast two-hybrid results indicated that GhTCPs can interact with each other to form homodimers or heterodimers. In addition, GhTCP14a and GhTCP22 can interact with some transcription factors which are involved in fiber development. These results lay solid foundation for further study on the functions of TCP genes during cotton fiber development.
Highlights
TCP proteins, designated from names of four proteins TB1 (TEOSINTE BRANCHED 1) in maize (Zea mays), CYC (CYCLOIDEA) in snapdragon (Antirrhinum majus) and PCF1/2 (PROLIFERATING CELL FACTORS 1/2) in rice (Oryza sativa), are plant-specific transcription factors (TFs)
74 non-redundant TCP genes were identified in upland cotton genome (Table 1)
The number of GhTCPs is about 3.1 folds of AtTCPs, which is slightly higher than the ratio of putative cotton homologs to each Arabidopsis gene[22, 23, 37]
Summary
TCP proteins, designated from names of four proteins TB1 (TEOSINTE BRANCHED 1) in maize (Zea mays), CYC (CYCLOIDEA) in snapdragon (Antirrhinum majus) and PCF1/2 (PROLIFERATING CELL FACTORS 1/2) in rice (Oryza sativa), are plant-specific transcription factors (TFs). Previous studies showed that overexpressing GhTCP14 in Arabidopsis enhances the initiation and elongation of trichomes by binding to the promoters of auxin-related genes[33], whereas GbTCP (a homolog of AtTCP15) silence in cotton leads to shorter fibers, associating with decreased expression of JA biosynthesis genes[34]. These data indicate that GhTCP14 and GbTCP play important roles in fiber development through phytohormone signaling pathways. These data provide valuable information for understanding the classification and putative functions of GhTCPs, throw some light into further investigation of the molecular mechanism of TCP proteins involved in fiber development
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