Genome-Wide Identification, Expansion, Evolution, and Expression Analysis Reveals ABCB Genes Important for Secondary Cell Wall Development in Moso Bamboo (Phyllostachys edulis)

The ATP-binding cassette subfamily B (ABCB) is an important transporter family, and many members are well known for their auxin transport function. However, reports on the function of ABCB genes during Moso bamboo development few. In this study, we identified characterized 37 PhABCB in classified them into five subgroups, Ⅰ–Ⅴ. We further observed gene family expansion loss events evolution family. It was found that mainly attributed to whole-genome duplication DNA-transposed models. Gene co-expression analysis quantitative real-time PCR revealed several may be involved secondary cell wall (SCW) rapid growth bamboo. Through examining expression different parts internode where walls exhibited developmental stages, roles eight candidate PhABCBs SCW were characterized. Of genes, PhABCB7, PhABCB11, PhABCB14, PhABCB21 biogenesis This study provides basis discovering potential role development; studies needed elucidate how these by regulating polar auxin.