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Investigating the mechanism of auxin-mediated fulvic acid-regulated root growth in Oryza sativa through physiological and transcriptomic analyses

文献类型： 外文期刊

作者： Tang, Yi 1 ; Chen, Ke 1 ; Guo, Yanan 4 ; Li, Tianrui 4 ; Kuang, Na 1 ; Liu, Zhixuan 1 ; Yang, Haona 1 ;

作者机构： 1.Hunan Acad Agr Sci, Changsha 410125, Peoples R China

2.Hunan Acad Agr Sci, Hunan Weed Sci Key Lab, Changsha 410125, Peoples R China

3.Hunan Acad Agr Sci, Hunan Hybrid Rice Res Ctr, State Key Lab Hybrid Rice, Changsha 410125, Peoples R China

4.Hunan Univ, Coll Biol, Longping Branch, Changsha 410125, Peoples R China

关键词： Fulvic acid; Rice; Root systems; Transcriptome; Auxin

期刊名称：PLANTA （ 影响因子：3.8； 五年影响因子：4.4 ）

ISSN： 0032-0935

年卷期： 2025 年 261 卷 1 期

页码：

收录情况： SCI

摘要： As rice is one of the most crucial staple food sources worldwide, enhancing rice yield is paramount for ensuring global food security. Fulvic acid (FA), serving as a plant growth promoter and organic fertilizer, holds significant practical importance in studying its impact on rice root growth for improving rice yield and quality. This study investigated the effects of different concentrations of FA on the growth of rice seedlings. The results indicated that 0.05 g/L FA could promote the growth of rice seedlings, while 0.5 g/L FA inhibited root growth, reduced cell activity and enzyme activity in the root tips, and accumulated reactive oxygen species in root cells. To further elucidate the molecular mechanisms underlying these effects, we performed transcriptomic analysis and found that auxin (Aux) may be involved in the growth process mediated by FA. Furthermore, transcriptome heatmap analysis revealed a significant upregulation of the Aux/indoleacetic acid (Aux/IAA) gene family after FA treatment, suggesting that this gene family plays a crucial role in the impact of FA on root growth. Additionally, by detecting endogenous Aux content and adding exogenous Aux inhibitors, we confirmed the involvement of FA in rice seedling root growth as well as in the synthesis and transduction pathway of Aux.

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