Abstract
The WRKY gene family plays an important role in the development and stress responses in plants. As information is not available on the WRKY gene family in Musa species, genome-wide analysis has been carried out in this study using available genomic information from two species, Musa acuminata and Musa balbisiana. Analysis identified 147 and 132 members of the WRKY gene family in M. acuminata and M. balbisiana, respectively. Evolutionary analysis suggests that the WRKY gene family expanded much before the speciation in both the species. Most of the orthologs retained in two species were from the γ duplication event which occurred prior to α and β genome-wide duplication (GWD) events. Analysis also suggests that subtle changes in nucleotide sequences during the course of evolution have led to the development of new motifs which might be involved in neo-functionalization of different WRKY members in two species. Expression and cis-regulatory motif analysis suggest possible involvement of Group II and Group III WRKY members during various stresses and growth/development including fruit ripening process respectively.
Highlights
Transcription factors bind to the specific DNA motifs, regulate gene expression and control various signaling and regulatory networks involved in the proper growth and development as well as stress response in an organism
This profile was used for the identification of WRKY gene family members from the protein sequence of M. acuminata and M. balbisiana
After removal of partial and redundant sequences, a total of 147 and 132 WRKY genes were identified from M. acuminata and M. balbisiana, respectively (Supplementary Table 2)
Summary
Transcription factors bind to the specific DNA motifs, regulate gene expression and control various signaling and regulatory networks involved in the proper growth and development as well as stress response in an organism. We have used these genomic resources to identify members of the WRKY gene family and correlated their expression with plant growth/development and stress response. Ripening related expression of the identified WRKY genes was analyzed using transcriptome datasets of M. acuminata fruit under acetylene response for 40, 60, and 90 days (D’Hont et al, 2012).
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