Genome-Wide Identification of the Highly Conserved INDETERMINATE DOMAIN ( IDD ) Zinc Finger Gene Family in Moso Bamboo ( Phyllostachys edulis )

proteins, a family of transcription factors unique to plants, function in multiple developmental processes. Although the gene family has been identified in many plants, little is known about it in moso bamboo. In this present study, we identified 32 family genes in moso bamboo and randomly sequenced the full-length open reading frames (ORFs) of ten . All PheIDDs shared a highly conserved IDD domain that contained two canonical C2H2-ZFs, two C2HC-ZFs, and a nuclear localization signal. Collinearity analysis showed that segmental duplication events played an important role in expansion of the gene family. Synteny analysis indicated that 30 genes were orthologous to those of rice ( ). Thirty were expressed at low levels, and most exhibited characteristic organ-specific expression patterns. Despite their diverse expression patterns in response to exogenous plant hormones, 8 and 22 responded rapidly to IAA and 6-BA treatments, respectively. The expression levels of 23 were closely related to the outgrowth of aboveground branches and 20 were closely related to the awakening of underground dormant buds. In addition, we found that the gene generated two products by alternative splicing. Both isoforms interacted with PheDELLA and PheSCL3. Furthermore, both isoforms could bind to the -elements of three genes (PH02Gene17121, PH02Gene35441, PH02Gene11386). Taken together, our work provides valuable information for studying the molecular breeding mechanism of lateral organ development in moso bamboo.