A novel single-base mutation in CaBRI1 confers dwarf phenotype and brassinosteroid accumulation in pepper
文献类型： 外文期刊
作者： Yang, Bozhi 1 ; Zhou, Shudong 2 ; Ou, Lijun 2 ; Liu, Feng 2 ; Yang, Liying 2 ; Zheng, Jingyuan 2 ; Chen, Wenchao 2 ; Zhan 1 ;
作者机构： 1.Cent South Univ, Longping Branch, Changsha 410083, Peoples R China
2.Hunan Acad Agr Sci, Vegetable Inst, Changsha 410125, Peoples R China
关键词： Pepper; Dwarf mutant; Brassinosteroid; CaBRI1
期刊名称：MOLECULAR GENETICS AND GENOMICS （ 影响因子：3.291； 五年影响因子：3.257 ）
ISSN： 1617-4615
年卷期： 2020 年 295 卷 2 期
页码：
收录情况： SCI
摘要： Dwarfing is the development trend of pepper breeding. It is of great practical and scientific value to generate new dwarf germplasms, and identify new genes or alleles conferring dwarf traits in pepper. In our previous study, a weakly BR-insensitive dwarf mutant, E29, was obtained by EMS mutagenesis of the pepper inbred line 6421. It can be used as a good parent material for breeding new dwarf varieties. Here, we found that this dwarf phenotype was controlled by a single recessive gene. Whole-genome resequencing, dCAPs analysis, and VIGs validation revealed that this mutation was caused by a nonsynonymous single-nucleotide mutation (C to T) in CaBRI1. An enzyme activity assay, transcriptome sequencing, and BL content determination further revealed that an amino-acid change (Pro1157Ser) in the serine/threonine protein kinase and catalytic (S_TKc) domain of CaBRI1 impaired its kinase activity and caused the transcript levels of two important genes (CaDWF4 and CaROT3) participating in BR biosynthesis to increase dramatically in the E29 mutant, accompanied by significantly increased accumulation of brassinolide (BL). Therefore, we concluded that the novel single-base mutation in CaBRI1 conferred the dwarf phenotype and resulted in brassinosteroid (BR) accumulation in pepper. This study provides a new allelic variant of the height-regulating gene CaBRI1 that has theoretical and practical values for the breeding of the plants suitable for the facility cultivation and mechanized harvesting of pepper varieties.
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