title: The methylation of the PcMYB10 promoter is associated with green-skinned sport in Max Red Bartlett pear.
abstract: Varieties of the European pear (Pyrus communis) can produce trees with both red- and green-skinned fruits, such as the Max Red Bartlett (MRB) variety, although little is known about the mechanism behind this differential pigmentation. In this study, we investigated the pigmentation of MRB and its green-skinned sport (MRB-G). The results suggest that a reduction in anthocyanin concentration causes the MRB-G sport. Transcript levels of PcUFGT (for UDP-glucose:flavonoid 3-O-glucosyltransferase), the key structural gene in anthocyanin biosynthesis, paralleled the change of anthocyanin concentration in both MRB and MRB-G fruit. We cloned the PcMYB10 gene, a transcription factor associated with the promoter of PcUFGT. An investigation of the 2-kb region upstream of the ATG translation start site of PcMYB10 showed the regions -604 to -911 bp and -1,218 to -1,649 bp to be highly methylated. A comparison of the PcMYB10 promoter methylation level between the MRB and MRB-G forms indicated a correlation between hypermethylation and the green-skin phenotype. An Agrobacterium tumefaciens infiltration assay was conducted on young MRB fruits by using a plasmid constructed to silence endogenous PcMYB10 via DNA methylation. The infiltrated fruits showed blocked anthocyanin biosynthesis, higher methylation of the PcMYB10 promoter, and lower expression of PcMYB10 and PcUFGT. We suggest that the methylation level of PcMYB10 is associated with the formation of the green-skinned sport in the MRB pear. The potential mechanism behind the regulation of anthocyanin biosynthesis is discussed.
authors: Laboratory of Fruit Cell and Molecular Breeding, College of Agronomy and Bio-tech, China Agricultural University, Beijing 100193, China.
authors: Zhigang
authors: Z
authors: Wang
authors: Dong
authors: D
authors: Meng
authors: Aide
authors: A
authors: Wang
authors: Tianlai
authors: T
authors: Li
authors: Shuling
authors: S
authors: Jiang
authors: Peihua
authors: P
authors: Cong
authors: Tianzhong
authors: T
authors: Li
mesh_terms: D016960:Agrobacterium tumefaciens / Q000235:genetics; D000872:Anthocyanins / Q000378:metabolism*; D003001:Cloning, Molecular; D019175:DNA Methylation; D005638:Fruit / Q000502:physiology; D018506:Gene Expression Regulation, Plant; D020868:Gene Silencing; D005964:Glucosyltransferases / Q000235:genetics* / Q000378:metabolism; D008969:Molecular Sequence Data; D010858:Pigmentation / Q000235:genetics; D010940:Plant Proteins / Q000235:genetics* / Q000378:metabolism; D011401:Promoter Regions, Genetic; D031989:Pyrus / Q000235:genetics* / Q000502:physiology; D014157:Transcription Factors / Q000235:genetics / Q000378:metabolism
chemical_list: D000872:Anthocyanins; D010940:Plant Proteins; D014157:Transcription Factors; D005964:Glucosyltransferases; C023249:flavonol 3-O-glucosyltransferase
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