Fig. 3

Paralogous genes, duplicate type, and synteny analysis of NAC genes between J. regia and three groups of representative plant species. a Schematic representation for the chromosomal distribution and interchromosomal relationships of Persian walnut NAC genes. Gray lines indicate duplicated NAC gene pairs. The chromosome number is indicated at the bottom of each chromosome. b The 102 JrNAC member duplicate type in Persian walnut. c Synteny analysis of NAC genes between J. regia and three plant species. Gray lines in the background indicate the collinear blocks within Persian walnut and other plant genomes, while the red lines highlight the syntenic NAC gene pairs. The species names with the prefixes “P. trichocarpa,” “O. europaea,” and “Q. robur” indicate Populus trichocarpa, Olea europaea, and Quercus robur, respectively