Find in Library

The plant <i>MYB</i> transcription factor family featured as highly conserved DNA-binding domains consisting of 1 to 4 imperfect repeats (R). Increasing evidence indicates that <i>MYB</i> genes participates in growth, differentiation, metabolism, and biotic and abiotic stress responses. However, the functions of <i>MYB</i> genes in the rubber tree remain to be deeply elucidated, especially <i>R2R3-MYB</i> gene family. In this study, molecular biology, bioinformatics, and qRT-PCR were used to identify and analyze <i>HbR2R3-MYB</i> gene family members in the rubber tree. A total of 132 members of the <i>R2R3-MYB</i> gene family were identified in the rubber tree based on genome-wide level. Most of the <i>HbR2R3-MYBs</i> were mapped to 17 rubber tree chromosomes except four genes. A phylogenetic analysis divided all the <i>HbR2R3-MYBs</i> into 20 subgroups with <i>Arabidopsis thaliana</i>. MEME analysis showed that the protein of <i>HbR2R3-MYBs</i> was characterized by 9 conserved motifs. Twenty-six representative R2R3 <i>HbMYBs</i> from different subgroups were selected for expression profiles analysis and the results revealed that the <i>HbR2R3-MYBs</i> members showed various expression patterns in different tissues, powdery mildew-infected and ethylene treatment, implying the diversity of their functions in rubber trees. These results provide fundamental knowledge for further studying the response of the <i>HbR2R3-MYB</i> family to stress and regulation latex flow in rubber tree.