Identification and evolution analysis of genes of and and their expression profiles under abiotic stress.

The YUCCAs (YUC) are functionally identified flavin-containing monooxidases (FMOs) in plants that act as an important rate-limiting enzyme functioning in the auxin synthesis IPA (indole-3-pyruvic acid) pathway. In this study, 12 MsYUCs and 15 MtYUCs containing characteristic conserved motifs were identified in ( L.) and ( Gaertn.), respectively. Phylogenetic analysis revealed that YUC proteins underwent an evolutionary divergence. Both tandem and segmental duplication events were presented in and genes. Comparative syntenic maps of with , (), or rice ( L.) were constructed to illustrate the evolution relationship of the YUC gene family. A large number of cis-acting elements related to stress response and hormone regulation were revealed in the promoter sequences of . Expression analysis showed that had a tissue-specific, genotype-differential expression and a differential abiotic stress response pattern based on transcriptome data analysis of online. In addition, RT-qPCR confirmed that salt stress significantly induced the expression of but significantly inhibited expression and the expression of was significantly induced by cold treatment. These results could provide valuable information for functional analysis of genes via gene engineering of the auxin synthetic IPA pathway in .