Meanwhile, since IAA and its early responsive genes play vital roles in pear FDR [63], and the function of GH3 genes in response to abiotic stresses had been generally reported [39,40,41], PbrGH3s might be involved in responses to Fe deficiency, especially for PbrGH3.5. This evidence concerns the gene H3-4 and hyperinsulinemic hypoglycemia, familial, 4.