Genome-wide identification of DUF506 gene family in Oryza sativa and expression profiling under abiotic stresses.

The domain of unknown function 560 (DUF560), also known as the PDDEXK_6 family, is a ubiquitous plant protein that has been confirmed to play critical roles in Arabidopsis root development as well as ABA and abiotic responses. However, genome-wide identification and expression pattern analysis in rice () still need to be improved. Based on the phylogenetic relationship, 10 genes were identified and classified into four subfamilies. Segmental duplication was essential to the expansion of , which were subjected to purifying selective pressure. Except for and , the shared colinear gene pairs with five monocot species, showing that they were conserved in evolution. Furthermore, the conserved domains, gene structures, SNPs distribution, and targeting miRNAs were systematically investigated. Massive cis-regulatory elements were discovered in promoter regions, implying that may be important in hormone regulation and abiotic stress response. Therefore, we analyzed plant hormone-induced transcriptome data and performed qRT-PCR on eight under drought, cold, and phosphorus-deficient stresses. The results revealed that most respond to ABA and JA treatment, as well as drought and cold conditions. In conclusion, our findings provided insights into the evolution and function of , which could benefit crop breeding in the future.