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Genetic variations at BBX24 and MYB110a loci regulated anthocyanin accumulation in pear bud sports

文献类型： 外文期刊

作者： Gao, Yuhao 1 ; Li, Hongxu 2 ; Wang, Zhiwei 1 ; Xue, Huabai 3 ; Li, Jianzhao 4 ; Yu, Wenjie 1 ; Zhang, Jiaxin 1 ; Ni, Junbei 1 ; Teng, Yuanwen 1 ; Bai, Songling 1 ;

作者机构： 1.Zhejiang Univ, Coll Agr & Biotechnol, Hangzhou 310058, Zhejiang, Peoples R China

2.Gansu Acad Agr Sci, Inst Fruit & Floriculture Res, Lanzhou 730070, Gansu, Peoples R China

3.Chinese Acad Agr Sci, Zhengzhou Fruit Res Inst, Zhengzhou 450009, Henan, Peoples R China

4.Ludong Univ, Engn Res Inst Agr & Forestry, Yantai 264025, Shandong, Peoples R China

关键词： Pear; Anthocyanin; Bud sport; BBX24 transcription factor; MYB110a transcription factor

期刊名称：HORTICULTURAL PLANT JOURNAL （ 影响因子：6.2； 五年影响因子：6.1 ）

ISSN： 2095-9885

年卷期： 2025 年 11 卷 4 期

页码：

收录情况： SCI

摘要： Genetic variation contributes to the phenotypic diversity of plants. Most red pear cultivars that accumulate anthocyanins originated from somatic variation and are termed as bud sports. 'Hongzaosu' is a bud sport derived from the green pear 'Zaosu'. A new genetic map was constructed from a population derived from the cross of 'Yuluxiang' and 'Hongzaosu', from which PpBBX24 was identified as a crucial gene controlling anthocyanin accumulation. Genetic and phylogenetic evidences revealed that PpBBX24 is a repressor of anthocyanin biosynthesis in pear. A 14 bp deletion was detected in the third exon of PpBBX24 in 'Hongzaosu', resulting in premature termination of protein translation. The truncated PpBBX24 protein was a positive regulator of anthocyanin biosynthesis by activating the transcription of PpCHS and PpUFGT. Three independent variations in the BBX24 coding region that led to premature termination of translation were detected in other pear bud sports and the progeny of a bud sport that all accumulate anthocyanins. The genome of'Hongzaosu' was assembled using both long-read and short-read sequences. By combining genomic and transcriptomic data, allele-specific expression of PpMYB110a was observed in the fruit skin of 'Hongzaosu', which was likely caused by a large variation in the promoter. This work enhances understanding of coloration in red pears and provides a novel genomic resource for further studies on 'Hongzaosu' pear.

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