Genome-Wide Identification, Expression and Stress Analysis of the GRAS Gene Family in .

GRAS genes are important transcriptional regulators in plants that govern plant growth and development through enhancing plant hormones, biosynthesis, and signaling pathways. Drought and other abiotic factors may influence the defenses and growth of , which is a superb timber source for the construction industry and building exquisite furniture. Although genome-wide identification of the GRAS gene family has been completed in many species, that of most woody plants, particularly , has not yet begun. We performed a genome-wide investigation of 56 genes, which are unequally distributed across 12 chromosomes. They are divided into nine subclades. Furthermore, these 56 genes have a substantial number of components related to abiotic stress responses or phytohormone transmission. Analysis using qRT-PCR showed that the expression of four genes, namely , , and , was differentially increased in response to drought, salt and temperature stresses, respectively. We hypothesize that they may help to successfully resist harsh environmental disturbances. In this work, we conducted a comprehensive survey of the GRAS gene family in plants, and the results provide an extensive and preliminary resource for further clarification of the molecular mechanisms of the GRAS gene family in in response to abiotic stresses and forestry improvement.