Identification and Characterization of Trihelix Transcription Factors and Expression Changes during Flower Development in Pineapple

Trihelix transcription factors with helix–loop–helix–loop–helix characteristics are essential in plant growth, development, and response to adversity. Several potential functions of have been studied multiple species, but little is known about the features genes pineapple. In this study, 23 members were identified classified into 5 groups unevenly distributed 17 chromosomes The results revealed that six fragment duplication events one tandem event found through gene analysis. Moreover, 4, 10, 21, homologous pairs between pineapple Arabidopsis, grape, banana, rice, respectively. promoters many cis-elements, especially light hormone response. expression AcTrihelix showed obvious tissue specificities different tissues. expressions AcTrihelix3, AcTrihelix8, AcTrihelix16, AcTrihelix19, AcTrihelix20, AcTrihelix23 maintained at high levels during late stage flower bud development. floral organs, was very different. conclusion, some may play important roles development pineapple, they provide resources for further studies function molecular mechanism formation.