Back Article

Figure 1. 

Three developmental stages of four varieties of pitaya. (For 'Jinduyihao', 'Yuenanbairou', and 'Wucihuanglong', the green fruit stage occurred at 20 DAP, the color transition stage at 25 DAP, and the mature stage at 30 DAP. In contrast, for 'Yanwoguo', the green fruit stage occurred at 90 DAP, the color transition stage at 105 DAP, and the mature stage at 120 DAP).

Figure 2. 

(a) PCA map of the transcriptome; (b) PCA map of the metabolome.

Figure 3. 

(a) Transcriptome KEGG enrichment analysis. (b) Metabolome KEGG enrichment analysis.

Figure 4. 

DAMs and DEGs in the betalain metabolic pathway of pitaya peel. (a) Expression analysis of betalain synthesis pathway genes in four pitaya varieties at three periods of time. (b) Heat map of metabolite content clustering of betalain synthesis pathway.

Figure 5. 

DAMs and DEGs in the flavonoid synthesis pathway of pitaya peel. (a) Expression analysis of flavonoid synthesis pathway genes in four pitaya varieties at three periods of time. (b) Clustered heat map of metabolite content of flavonoid synthesis pathway.

Figure 6. 

DAMs and DEGs in the carotenoid synthesis pathway of pitaya peel. (a) Expression analysis of carotenoid synthesis pathway genes in four pitaya varieties at three time periods. (b) Clustered heat map of metabolite content of carotenoid synthesis pathway.

Figure 7. 

DAMs and DEGs in the chlorophyll metabolism pathway of pitaya peel. (a) Expression analysis of chlorophyll metabolism pathway genes in four pitaya varieties at three periods of time. (b) Clustered heat map of metabolite content of chlorophyll metabolic pathways.

Figure 8. 

Pitaya peel color-related DEGs qRT-PCR detection.

Figure 9. 

Proposed regulatory model of pigment metabolic pathways underlying peel color differentiation in pitaya.