PpGST1, an anthocyanin-related glutathione S-transferase gene, is essential for fruit coloration in peach.

Abstract:

:Anthocyanins have crucial biological functions and affect quality of horticultural produce. Anthocyanins accumulate in ripe peach fruit; differential accumulation is observed in deep coloured cultivar 'Hujingmilu' and lightly pigmented cultivar 'Yulu'. The difference was not fully explained by accumulation of total flavonoids and expression of anthocyanin biosynthetic genes. Expression analysis was conducted on a glutathione S-transferase gene (PpGST1), and it was found that the expression correlated well with anthocyanin accumulation in peach fruit tissues. Functional complementation of the Arabidopsis tt19 mutant indicated that PpGST1 was responsible for transport of anthocyanins but not proanthocyanidins. PpGST1 was localized in nuclei and the tonoplast, including the sites at which anthocyanin vacuolar sequestration occurred. Transient overexpression of PpGST1 together with PpMYB10.1 in tobacco leaves and peach fruit significantly increased anthocyanin accumulation as compared with PpMYB10.1 alone. Furthermore, virus-induced gene silencing of PpGST1 in a blood-fleshed peach not only resulted in a reduction in anthocyanin accumulation but also a decline in expression of anthocyanin biosynthetic and regulatory genes. Cis-element analysis of the PpGST1 promoter revealed the presence of four MYB binding sites (MBSs). Dual-luciferase assays indicated that PpMYB10.1 bound to the promoter and activated the transcription of PpGST1 by recognizing MBS1, the one closest to the ATG start codon, with this trans-activation being stronger against the promoter of deep coloured 'Hujingmilu' compared with lightly coloured cultivar 'Yulu'. Altogether, our data provided molecular evidence supporting coordinative regulatory roles of PpGST1 and PpMYB10.1 in anthocyanin accumulation in peach.

journal_name

Plant Biotechnol J

authors

Zhao Y,Dong W,Zhu Y,Allan AC,Lin-Wang K,Xu C

doi

10.1111/pbi.13291

subject

Has Abstract

pub_date

2020-05-01 00:00:00

pages

1284-1295

issue

5

eissn

1467-7644

issn

1467-7652

journal_volume

18

pub_type

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