Figure 1. Distribution of all peanut AhXTH genes on chromosomes.

The 58 AhXTH genes were unevenly distributed on the 18 chromosomes, with the exception of chr. 07 and 17. The location on the chromosome of each AhXTH gene was indicated on the right side of the respective chromosome. The gene names belonging to the I/II, the IIIA and the IIIB subfamily were respectively represented by black, red, and blue words. The red box represented the clusters of tandemly duplicated genes. The scale bar for chromosome length was showed at the left of all chromosomes.