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Downregulation of RdDM during strawberry fruit ripening

文献类型： 外文期刊

作者： Cheng, Jingfei 1 ; Niu, Qingfeng 2 ; Zhang, Bo 4 ; Chen, Kunsong 4 ; Yang, Ruihua 5 ; Zhu, Jian-Kang 2 ; Zhang, Yijing 1 ;

作者机构： 1.Chinese Acad Sci, Natl Key Lab Plant Mol Genet, CAS Ctr Excellence Mol Plant Sci, Inst Plant Physiol & Ecol,Shanghai Inst Biol Sci, Shanghai 200032, Peoples R China

2.Univ Chinese Acad Sci, Beijing 100049, Peoples R China

3.Chinese Acad Sci, Natl Key Lab Plant Mol Genet, Shanghai Ctr Plant Stress Biol, Ctr Excellence Mol Plant Sci,Shanghai Inst Biol S, Shanghai 200032, Peoples R China

4.Zhejiang Univ, Zhejiang Prov Key Lab Hort Plant Integrat Biol, Lab Fruit Qual Biol, Zijingang Campus, Hangzhou 310058, Zhejiang, Peoples R China

5.Heilongjiang Acad Agr Sci, Dept Hort, Harbin, Heilongjiang, Peoples R China

6.Purdue Univ, Dept Hort & Landscape Architecture, W Lafayette, IN 47907 USA

关键词： DNA methylation; Fruit ripening; Strawberry; RdDM; siRNA

期刊名称：GENOME BIOLOGY （ 影响因子：13.583； 五年影响因子：17.433 ）

ISSN： 1474-760X

年卷期： 2018 年 19 卷

页码：

收录情况： SCI

摘要： Background: Recently, DNA methylation was proposed to regulate fleshy fruit ripening. Fleshy fruits can be distinguished by their ripening process as climacteric fruits, such as tomatoes, or non-climacteric fruits, such as strawberries. Tomatoes undergo a global decrease in DNA methylation during ripening, due to increased expression of a DNA demethylase gene. The dynamics and biological relevance of DNA methylation during the ripening of non-climacteric fruits are unknown. Results: Here, we generate single-base resolution maps of the DNA methylome in immature and ripe strawberry. We observe an overall loss of DNA methylation during strawberry fruit ripening. Thus, ripening-induced DNA hypomethylation occurs not only in climacteric fruit, but also in non-climacteric fruit. Application of a DNA methylation inhibitor causes an early ripening phenotype, suggesting that DNA hypomethylation is important for strawberry fruit ripening. The mechanisms underlying DNA hypomethylation during the ripening of tomato and strawberry are distinct. Unlike in tomatoes, DNA demethylase genes are not upregulated during the ripening of strawberries. Instead, genes involved in RNA-directed DNA methylation are downregulated during strawberry ripening. Further, ripening-induced DNA hypomethylation is associated with decreased siRNA levels, consistent with reduced RdDM activity. Therefore, we propose that a downregulation of RdDM contributes to DNA hypomethylation during strawberry ripening. Conclusions: Our findings provide new insight into the DNA methylation dynamics during the ripening of non-climacteric fruit and suggest a novel function of RdDM in regulating an important process in plant development.

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