Abstract
Ascorbate peroxidases (APXs) are heme-dependent H2O2 scavenging enzymes involved in myriad biological processes. Herein, a total of 21 TaAPX and six TaAPX-R genes were identified from the A, B and D sub-genomes of Triticum aestivum L. The occurrence of three paralogous gene pairs with unequal evolutionary rate suggested functional divergence. The phylogenetic analysis formed four distinct clades having conserved gene and protein architecture, and sub-cellular localization. The tertiary structure analysis revealed the presence of helices and coils and residues involved in ligand binding. Transcriptional profiling of each TaAPX and TaAPX-R gene suggested their specific role during development and stress response. Modulated transcript expression and APX enzyme activity during various stress conditions indicated their role in stress response. Interaction analyses suggested their association with other genes, miRNAs and various legends. The present study reported numerous features of these genes, and may provide a platform for their detailed functional characterization in future studies.
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