Genome-wide identification, characterization and expression profile of glutaredoxin gene family in relation to fruit ripening and response to abiotic and biotic stresses in banana (Musa acuminata).

Glutaredoxins (GRXs) are disulfide oxidoreductases that are involved in various biological processes. However, little information on the role of GRXs in the regulation of fruit ripening and the response to stress is available. In this study, we isolated 64 GRX genes from banana genome. Their encoded GRX proteins could be classified into four classes: CC, CGFS, CPYC and GRL types. The distribution and synteny of these GRXs on chromosomes, the gene structures, the promoter sequences, and the possible protein subcellular localizations were characterized. Molecular interaction network analysis suggested that MaGRX might interact with glutathione reductase (GR), sulfiredoxin, peroxiredoxin (Prx), and NADPH-dependent thioredoxin reductase C (NTRC), contributing to the antioxidative defense of banana fruit. MicroRNA prediction showed that MaGRX genes might be targeted by different miRNAs. Transcriptome analysis characterized the expression profiles of different MaGRX genes during banana fruit ripening, and in response to different storage stresses. The results suggested that CC-type, CPYC-type and GRL-type MaGRXs might be more active than CGFS-type MaGRXs during banana fruit ripening and the response to stress. Moreover, MaGRX6/7/9/11/17/23/28 and MaGRL3/16/19 might play important roles in regulating fruit ripening or in response to low and high temperature, or Fusarium proliferatum infection.