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AcMYB266, a key regulator of the red coloration in pineapple peel: a case of subfunctionalization in tandem duplicated genes

文献类型： 外文期刊

作者： Zhang, Wei 1 ; Wu, Jing 1 ; He, Junhu 2 ; Liu, Chaoyang 1 ; Yi, Wen 1 ; Xie, Jingyao 4 ; Wu, Ya 5 ; Xie, Tao 6 ; Ma, Jun 7 ; Zhong, Ziqin 1 ; Yang, Mingzhe 1 ; Chen, Chengjie 2 ; Luan, Aiping 2 ; He, Yehua 1 ;

作者机构： 1.South China Agr Univ, Coll Hort, Key Lab Biol & Germplasm Enhancement Hort Crop Sou, Minist Agr & Rural Areas, 483 Wushan Rd,Wushan St, Guangzhou 510642, Guangdong, Peoples R China

2.Chinese Acad Trop Agr Sci, Trop Crops Genet Resources Inst, Natl Key Lab Trop Crop Breeding, Sanya 572024, Hainan, Peoples R China

3.Minist Agr & Rual Affairs, Lab Crop Gene Resources & Germplasm Enhancement So, Key Lab Trop Crops Germplasm Resources Genet Impro, 4 Xueyuan Rd, Haikou 571101, Hainan, Peoples R China

4.Guangdong Ecoengn Polytech, Sch Landscape Architecture, 297 Guangshan 1st Rd, Guangzhou 510520, Guangdong, Peoples R China

5.Chinese Acad Trop Agr Sci, Environm & Plant Protect Inst, 4 Xueyuan Rd, Haikou 571101, Hainan, Peoples R China

6.Foshan Univ, Dept Hort, 18 Jiangwan 1st Rd, Foshan 528231, Guangdong, Peoples R China

7.Sichuan Agr Univ, Coll Landscape Architecture, 211 Huimin Rd, Chengdu 610000, Sichuan, Peoples R China

期刊名称：HORTICULTURE RESEARCH （ 影响因子：7.6； 五年影响因子：8.2 ）

ISSN： 2662-6810

年卷期： 2024 年 11 卷 6 期

页码：

收录情况： SCI

摘要： Red fruit peel is an attractive target for pineapple breeding. Various pineapple accessions with distinct red coloration patterns exist; however, the precise molecular mechanism accounting for these differences remains unknown, which hinders the pineapple breeding process from combining high fruit quality with red peel. In this study, we characterized a transcription factor, AcMYB266, which is preferentially expressed in pineapple peel and positively regulates anthocyanin accumulation. Transgenic pineapple, Arabidopsis, and tobacco plants overexpressing AcMYB266 exhibited significant anthocyanin accumulation. Conversely, transient silencing of this gene led to decreased anthocyanin accumulation in pineapple red bracts. In-depth analysis indicated that variations of AcMYB266 sequences in the promoter instead of the protein-coding region seem to contribute to different red coloration patterns in peels of three representative pineapple varieties. In addition, we found that AcMYB266 was located in a cluster of four MYB genes exclusive to and conserved in Ananas species. Of this cluster, each was proved to regulate anthocyanin synthesis in different pineapple tissues, illustrating an interesting case of gene subfunctionalization after tandem duplication. In summary, we have characterized AcMYB266 as a key regulator of pineapple red fruit peel and identified an MYB cluster whose members were subfunctionalized to specifically regulate the red coloration of different pineapple tissues. The present study will assist in establishing a theoretical mechanism for pineapple breeding for red fruit peel and provide an interesting case for the investigation of gene subfunctionalization in plants.

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