Comparative analysis of SIMILAR TO RCD ONE (SRO) family from tetraploid and diploid cottons depicts its role in growth and development

Abstract

Background SRO (Similar to RCD1) genes family is largely recognized for their importance in growth, development and in responding to environmental stresses. However, genome-wide identification and functional characterization of SRO genes from cotton species have not reported so far. Results A total of 36 SRO genes were identified from four cotton species. Phylogenetic analysis divided these genes into three groups with distinct structure. Syntenic and chromosomal distribution analysis indicated uneven distribution of GaSRO, GrSRO, GhSRO and GbSRO genes on A2, D5 genomes, Gh-At, Gh-Dt and Gb-At, Gb-Dt subgenomes, respectively. Gene duplication analysis revealed the presence of six duplicated gene pairs among GhSRO genes. In promoter analysis, several elements responsive to growth, development and hormones were interpreted in GhSRO genes, implying the reason for their induction during growth and developmental stages. Several miRNAs responsive to plant growth and abiotic stress responses were predicted that target 12 GhSRO genes. Organ-specific expression profiling explored the roles of GhSRO genes in one or more tissues. In addition, specific expression pattern of some GhSRO genes during ovule developmental stages depicted their involvement in these developmental processes. Conclusion The data presented in this report laid a foundation for understanding the classification and functions of SRO genes in cotton.