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Acta Horticulturae Sinica ›› 2025, Vol. 52 ›› Issue (6): 1451-1462.doi: 10.16420/j.issn.0513-353x.2024-0929

• Genetic & Breeding?Germplasm Resources?Molecular Biology • Previous Articles     Next Articles

Preliminary Research on the Molecular Mechanism of Color Loss in White Mulberry Fruit

GUO Xinmiao1, TIAN Luyao2, CAO Jiaqi2, XIE Yan2, GAO Yanxia2, and SUN Zhichao2,*()   

  1. 1 Chengde College of Applied Technology,Chengde,Heibei 067000
    2 Institute of Sericulture,Chengde Medical University,Chengde,Heibei 067000
  • Received:2025-01-23 Revised:2025-05-20 Online:2025-06-20 Published:2025-06-20
  • Contact: and SUN Zhichao

Abstract:

In order to reveal the mechanism of anthocyanin synthesis blockade in white mulberry,the metabolome and transcriptome of white mulberry and black mulberry were compared and analyzed. The results showed that the anthocyanin content of‘Anshen’(black fruit)gradually accumulated during the ripening process,and the accumulation amount was the highest in the ripening stage,while the anthocyanin content of‘Guihua’(white fruit)was the highest in the green fruit stage,and the anthocyanin content was lower at the veraison and maturity stages. The key color substances of anthocyanin glycosides,such as cyanidin,delphinin,pelargondin,malvidin pigment and petunidin,all had low accumulation in‘Guihua’,especially cyanidin-3-O-glucoside,cyanidin-3-O-rutinoside,delphin-3-O-glucoside,delphin-3-O-loccoside,pelargondin-3-O-glucoside,pelargondin-3-O-rutinoside,proanthocyanidin B1,proanthocyanidinin B3 and other substances showed a large accumulation in‘Anshen’. The expression of PALC4H4CLCHSCHIF3H and other genes involved in the biosynthesis of anthocyanins in‘Guihua’decreased during veraison,and this down-regulation prevented the accumulation of anthocyanins in white mulberry. Based on transcriptome data,six differentially expressed MYB transcription factor genes were identified,and combined with gene expression,evolutionary analysis and downstream target gene identification,it was analyzed that MYB6 may play an inhibitory role in the synthesis of anthocyanin glycosides during the maturation of white mulberry.

Key words: mulberry, transcriptome, metabolome, anthocyanin, structural gene, MYB6