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Figure 1. 

Phylogenetic tree of the 355 AP2/ERF genes from loquat (189) and Arabidopsis thaliana (136). Different color blocks represent different subfamily members.

Figure 2. 

Chromosomal location of the AP2/ERF genes in loquat.

Figure 3. 

Conserved motif and gene structure of loquat AP2/ERF gene family. (a) The phylogenetic tree of AP2/ERF genes. (b) Conserved motif distributions of AP2/ERF proteins. (c) Domains of loquat AP2/ERF genes. (d) Exon-intron distributions of AP2/ERF genes. The green and yellow boxes represent UTR and CDS, respectively.

Figure 4. 

Synteny analysis of AP2/ERF genes in loquat. Grey lines indicate all syntenic gene pairs in the loquat genome, red lines indicate collinearity relationships among loquat AP2/ERF genes. LG represents the different chromosome. Red and blue represent the level of gene distribution density on the chromosome. The deeper color means the higher density of genes.

Figure 5. 

Synteny analysis of AP2/ERF genes between loquat and other plants. Grey lines in the background represent the collinear blocks between different plant genomes, and the red lines highlight the syntenic AP2/ERF gene pairs. The three species respectively indicate Arabidopsis, pomegranate (Punica granatum L.), and peach (Prunus persica L.).

Figure 6. 

Cis-acting elements in the promoter region of AP2/ERF genes in loquat. The 2,000 bp promoter region of the gene was analyzed. Different colors boxes represent different types of cis-acting elements and different groups of gene subfamilies.

Figure 7. 

The expression pattern analysis of the AP2/ERF gene family in different cultivars and developmental stages of loquat fruits. Red color represents high expression, while blue represents low expression. Fruits were harvested at four developmental stages (S1−S4), representing the expansion stage, the turning stage, the mature yellow stage, and the ripening stage.