Ethylene Inhibits Anthocyanin Biosynthesis by Repressing the R2R3-MYB Regulator SlAN2-like in Tomato

Fruit ripening is usually accompanied by anthocyanin accumulation. Ethylene is key in ripening-induced anthocyanin production in many fruits. However, the effects of fruit ripening and ethylene on anthocyanin biosynthesis in purple tomato fruits are unclear. This study shows that bagged fruits of th...

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Bibliographic Details
Published in:International journal of molecular sciences 2022-07, Vol.23 (14), p.7648
Main Authors: Xu, Yulian, Liu, Xiaoxi, Huang, Yinggemei, Xia, Zhilei, Lian, Zilin, Qian, Lijuan, Yan, Shuangshuang, Cao, Bihao, Qiu, Zhengkun
Format: Article
Language:English
Subjects:
Accumulation
Anthocyanins
Biosynthesis
Cultivars
Enzymes
Ethylene
Flavonoids
Fruits
Gene expression
Genes
Proteins
Ripening
SlAN2-like
tomato
Tomatoes
Transcription factors
transcriptome
Transcriptomics
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Summary:Fruit ripening is usually accompanied by anthocyanin accumulation. Ethylene is key in ripening-induced anthocyanin production in many fruits. However, the effects of fruit ripening and ethylene on anthocyanin biosynthesis in purple tomato fruits are unclear. This study shows that bagged fruits of the purple tomato cultivar ‘Indigo Rose’ failed to produce anthocyanins at the red ripening stage after bag removal. In contrast, the bagged immature fruits accumulated a significant amount of anthocyanins after removing the bags. The transcriptomic analyses between immature and red ripening fruit before and after bag removal revealed that anthocyanin-related genes, including the key positive R2R3-MYB regulator SlAN2-like, were repressed in the red ripening fruit. The 86 identified transcription factors, including 13 AP2/ERF, 7 bZIP, 8 bHLH and 6 MYB, showed significantly different expressions between immature and red ripening fruits. Moreover, subjecting bagged immature fruits to exogenous ethylene treatment significantly inhibited anthocyanin accumulation and the expression of anthocyanin-related genes, including the anthocyanin structure genes and SlAN2-like. Thus, ethylene inhibits anthocyanin biosynthesis by repressing the transcription of SlAN2-like and other anthocyanin-related genes. These findings provide new insights into anthocyanin regulation in purple tomato fruit.
ISSN:1422-0067
1661-6596
1422-0067
DOI:10.3390/ijms23147648