Genome-Wide Identification, Evolution, and Expression Analysis of and Gene Families in .

Trehalose biosynthesis enzyme homologues in plants contain two families, trehalose-6-phosphate synthases (TPSs) and trehalose-6-phosphate phosphatases (TPPs). Both families participate in trehalose synthesis and a variety of stress-resistance processes. Here, nine and ten genes were identified based on the genome, and all genes were classified into three classes. The Class I and Class II members differed substantially in gene structures, conserved motifs, and protein sequence identities, implying varied gene functions. Gene duplication analysis showed that one gene pair and four gene pairs are formed by duplication events. The value of (non-synonymous/synonymous) was less than 1, suggesting purifying selection in these gene families. The -elements and gene interaction network prediction showed that many family members may be involved in stress responses. The quantitative real-time reverse transcription (qRT-PCR) results further supported that most responded to at least one stress or abscisic acid (ABA) treatment, whereas over half of were downregulated after stress treatment, implying that play a more important role in stress responses than . This work provides a foundation for the genome-wide identification of the gene families and a frame for further studies of these gene families in abiotic stress responses.