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PbMADS49 Regulates Lignification During Stone Cell Development in 'Dangshansuli' (Pyrus bretschneideri) Fruit

文献类型： 外文期刊

作者： Meng, Dandan 1 ; Liu, Xin 1 ; Cao, Yunpeng 4 ; Cai, Yongping 1 ; Duan, Jinsheng 2 ;

作者机构： 1.Anhui Agr Univ, Sch Life Sci, Hefei, Peoples R China

2.Anhui Acad Agr Sci, Inst Plant Protect & Agroprod Safety, Hefei, Peoples R China

3.Minist Agr, Key Lab Agroprod Safety Risk Evaluat Hefei, Hefei, Peoples R China

4.Chinese Acad Sci, CAS Key Lab Plant Germplasm Enhancement & Specialt, Hubei Hongshan Lab, Wuhan Bot Garden,Innovat Acad Seed Design, Wuhan, Peoples R China

关键词： pear; stone cell development; lignin biosynthesis; PbMADS49; PbPRX33

期刊名称：PLANT CELL AND ENVIRONMENT （ 影响因子：6.3； 五年影响因子：7.7 ）

ISSN： 0140-7791

年卷期： 2025 年 48 卷 6 期

页码：

收录情况： SCI

摘要： Lignified stone cell content is one of the critical factors affecting 'Dangshansuli' fruit quality. The function of MADS-box transcription factors in regulating lignin biosynthesis in pear fruit is still less. In this study, PbMADS49 gene silencing inhibited the lignin biosynthesis and stone cell secondary wall development of pear fruit mainly through reducing the expression levels of lignin monomer polymerisation key enzymes (PbPRX33 and PbPRX45). PbMADS49 was a transcriptional repressor inhibiting its transcription by binding to the CArG element in the target gene promoter. Combined with the co-expression network and promoter cis-acting element analysis, we hypothesised that PbMADS49 positively regulates the transcription of PbPRX33 through PbWRKY63. The gene silencing effect of homologous genes PbPRX33-1 and PbPRX33-2 was consistent with PbMADS49, and PbPRX33-2 was more significant than PbPRX33-1. This study shows that PbMADS49 is a positive regulator of stone cell lignification, providing new insights into the development mechanism of pear stone cells.

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