LAUSR

Cellulose synthase (CESA) is a key enzyme in the synthesis of cellulose, which plays an important role in cell wall construction and plant growth and development. In this study, seven CesA genes of P. massoniana were identified by searching the transcriptome data. Bioinformatics analysis showed that the putative CESA proteins were composed of 984–1101 amino acids, each containing the typical motifs of CESA proteins. Phylogenetic analysis showed that Transcript4609, Tran-script2643 and Transcript1263 were clustered into three groups with proteins related to regulating secondary wall synthesis, while Transcript691, Transcript1283, Transcript418 and Transcript556 were categorized into three clades with those associated with the formation of the primary cell walls. RT-qPCR analysis showed that the CesA genes were differentially expressed in different tissues, and most of the genes were induced by different abiotic stress and hormones. Transcript4609, Tran-script2643 and Transcript1263 were mainly expressed in the xylem and could respond to drought and salt stress induced by ABA, MeJA, ETH and SA hormones, indicating that these three CesA genes may play an important role in the response to abiotic stress in P. massoniana. This study revealed the possible biochemical and physiological functions of the CesA gene in P. massoniana, which can provide a basis for further exploration of the function of the CesA gene in cell wall formation and the response to external stress.