Genome-wide Identification， Classification， Expression and Duplication Analysis of GRAS Family Genes in Juglans regia L.

Fifty-two GRAS genes are identified in walnut genome. Based on the evolutionary relationship and motif analysis， the walnut GRAS gene family was divided into eight subfamilies， and the sequence features analysis of JrGRAS proteins showed that the JrGRAS protein sequences were both conserved and altered during the evolutionary process. Gene duplication analysis indicated that seven GRAS genes in walnut have orthologous genes in other species， and five of them occurred duplicated events in walnut genome. Expression pattern analysis of the GRAS family genes in walnut showed that two JrGRAS genes (JrCIGRa-b and JrSCL28a) were differentially expressed between flower bud and leaf bud (p?