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A NAC Transcription Factor RsSND1 Regulating Secondary Cell Wall Deposition Involves in Fleshy Taproot Formation in Radish (Raphanus sativus L.)

文献类型： 外文期刊

作者： Wang, Yanping 1 ; Wang, Qingbiao 1 ; Wu, Xiangyu 1 ; Pang, Yuanting 1 ; Guo, Yu 1 ; Li, Zixiong 2 ; Zhang, Li 1 ;

作者机构： 1.Beijing Acad Agr & Forestry Sci, Natl Engn Res Ctr Vegetables, Beijing Vegetable Res Ctr, State Key Lab Vegetable Biobreeding,Beijing Key La, Beijing 100097, Peoples R China

2.China Agr Univ, Coll Hort, Beijing 100193, Peoples R China

关键词： Comparative transcriptome; Cultivated radish; Fleshy taproot; NAC transcription factor; Secondary cell wall; Wild radish

期刊名称：JOURNAL OF PLANT GROWTH REGULATION （ 影响因子：4.8； 五年影响因子：4.8 ）

ISSN： 0721-7595

年卷期： 2024 年 43 卷 6 期

页码：

收录情况： SCI

摘要： Cultivated radish (Raphanus sativus L.) has fleshy, edible taproot, while wild radish (Raphanus raphanistrum L.) has woody, non-edible taproot. Formation of fleshy taproot is the most important landmark event in the evolution and domestication of wild radish to cultivated radish. However, little is known about the molecular mechanisms underlying this process. Histological studies revealed that the decrease of secondary cell wall deposition in the xylem cells was critical for fleshy taproot formation. To find the key genes involved in this process, comparative transcriptome studies were carried out among three fleshy cultivated and one woody wild radish species. We identified 2861 common differentially expressed genes (cDEGs) which were enriched in secondary cell wall biogenesis-related pathways. Moreover, based on the expression profiles, a NAC transcription factor RsSND1 (Rsa10039519), the first layer master regulator in the biosynthesis of secondary cell wall, was identified and chosen for further analysis. Overexpression of RsSND1 in Arabidopsis led to stunted plant growth, ectopic deposition of secondary wall in parenchymatous cells of xylem, and increased secondary wall thickness of vessels. Moreover, genetic variation analysis of RsSND1 in 55 natural accessions identified four and two SNPs in exons and downstream regions, respectively, which would be related to fleshy taproot evolution. Together, our results revealed that RsSND1 regulated deposition of secondary cell wall and involved in fleshy taproot formation.

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