Differential phytohormone related senescence regulation in main and lateral roots of longan (Dimocarpus longan Lour.)

文献类型： 外文期刊

第一作者： Liu, Lin

作者： Liu, Lin;Shu, Bo;Shi, Shengyou;Liu, Liqin

作者机构：

关键词： Root activity; Transcriptome; Proteome; Abscisic acid; Ethylene

期刊名称：PLANT GROWTH REGULATION （ 影响因子：3.9； 五年影响因子：3.8 ）

ISSN： 0167-6903

年卷期： 2025 年 105 卷 4 期

页码：

收录情况： SCI

摘要： Root senescence (RS) is a common phenomenon in longans; however, its regulation is poorly understood. In this study, the main root was divided into three segments from tip to crown, i.e., distal (MDR), middle (MMR) and proximal (MPR) parts, and lateral roots emerging from the corresponding segments of the main root, i.e., lateral roots from the distal (LDR), middle (LMR) and proximal (LPR) parts, were used for analysis of morphological characteristics, physiological root activity, transcriptome, proteome, and phytohormone quantification, in order to understand the regulation of RS in longan seedlings. The root hair and epidermis of the proximal parts of the main and lateral roots exhibited senescence, and activity decreased from the distal to the proximal parts, suggesting that both the main and lateral roots underwent senescence. The transcriptome profile showed that 2692 and 1406 differentially expressed genes were involved in the RS of the main and lateral roots, respectively, and the proteome data exhibited 222 and 124 differentially accumulated proteins involved in the RS of the main and lateral roots, respectively, based on the MPR vs. MMR and LPR vs. LMR groups. Based on the correlation analysis of DAPs and DEGs, the KEGG pathways of carotenoid biosynthesis (abscisic acid) and steroid biosynthesis (brassinosteroid) were found to be significantly different in the main roots, and two KEGG pathways related to plant hormones, phenylalanine metabolism (salicylic acid) and cysteine and methionine metabolism (ethylene), were significant in the lateral roots. Furthermore, the abscisic acid concentration in MMR was 9.47% lower than that in MPR and was negatively related to the root activity of the main root. The concentration of 1-aminocyclopropane-1-carboxylic acid increased 1.59 times from LDR to LPR and was negatively related to the activity of the lateral root. Thus, the results of this study indicate that different phytohormones are related to senescence regulation in the main and lateral roots of longan seedlings. In addition, transcriptome and proteome data provide basic information related to RS in longan seedlings.

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