文献类型： 外文期刊

作者： Li, Junhao ¹ ; Ma, Yuchen ² ; Cui, Tingting ² ; Liu, Shaohua ² ; Li, Liulin ² ;

作者机构： 1.Hebei Acad Agr & Forestry, Shijiazhuang Inst Fruit Trees, Shijiazhuang 050061, Peoples R China

2.Shanxi Agr Univ, Coll Hort, Jinzhong 030801, Peoples R China

关键词： pear; arbutin; salicylic acid; transcriptome; UGT

期刊名称：HORTICULTURAE （ 影响因子：3.1； 五年影响因子：3.1 ）

ISSN：

年卷期： 2024 年 10 卷 6 期

页码：

收录情况： SCI

摘要： Salicylic acid (SA) is known to be an efficient elicitor of secondary metabolism in plants. Arbutin, a characteristic phenolic glycoside found in 'Yuluxiang' pear (Pyrus bretschneideri Rehder x Pyrus sinkiangensis Yu), is widely used in lightening agents, in addition to cough, anti-inflammatory, and anti-microbial remedies, among other applications. However, research into the synthesis of arbutin in pear is limited. This study aimed to clarify the effect of exogenous SA on the arbutin content of pear using HPLC and investigate the mechanism for arbutin accumulation using RNA-Seq analysis. HPLC revealed that SA increased the arbutin contents of leaf, fruit, and callus in pear and demonstrated that the effect of SA is concentration and time dependent. RNA-Seq analysis of pear callus treated with or without SA revealed 380 differentially expressed genes (DEGs), 335 of which were up-regulated. According to a KEGG database analysis, the highest number of genes were annotated for phenylpropane biosynthesis. Overall, 21 DEGs were found to be involved in the synthesis of hydroquinone and UDP-glucose, which are substrates of arbutin synthesis. It is noteworthy that the expression levels of three up-regulated genes (Pbr006844.1, Pbr021064.1 and Pbr021069.1) related to hydroquinone glycosyltransferase were induced by SA and hydroquinone. Furthermore, transient overexpression of PbUGT72B1 (Pbr021069.1) increased the arbutin content in pear callus. These data explain the regulation of gene transcription associated with the promotive effect of SA on arbutin biosynthesis in pear, thus providing a theoretical foundation for enhancing the arbutin content of fruit through genetic engineering.