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Indole-3-Butyric Acid Enhances Root Formation and Alleviates Low-Temperature Stress in Sugarcane: Molecular Insights and Identification of Candidate Genes

文献类型： 外文期刊

作者： Zhang, Xiao-Qiu 1 ; Liang, Yong-Jian 1 ; Song, Xiu-Peng 1 ; Yan, Mei-Xin 1 ; Tang, Li-Qiu 2 ; Qin, Zhen-Qiang 1 ; Huang, Yu-Xin 1 ; Li, De-Wei 1 ; Huang, Dong-Mei 1 ; Shi, Ze-Sheng 2 ; Zhang, Bao-Qing 1 ; Huang, Dong-Liang 1 ;

作者机构： 1.Guangxi Acad Agr Sci, Sugarcane Res Inst, Guangxi Key Lab Sugarcane Genet Improvement, Key Lab Sugarcane Biotechnol & Genet Improvement G, Nanning 530007, Peoples R China

2.Guangxi South Subtrop Agr Sci Res Inst, Chongzuo 532415, Peoples R China

关键词： abiotic stress; root system; phytohormone; transcriptome; seedcane

期刊名称：PLANTS-BASEL （ 影响因子：4.1； 五年影响因子：4.5 ）

ISSN： 2223-7747

年卷期： 2025 年 14 卷 10 期

页码：

收录情况： SCI

摘要： Sugarcane (Saccharum officinarum L.) faces significant challenges in China, including labor-intensive cultivation, low yields, and environmental stresses. Enhancing root development and stress tolerance through phytohormones and molecular breeding is a promising approach to boosting productivity. Indole-3-butyric acid is a phytohormone known for promoting root development and stress resistance. However, its effects on sugarcane root development under low temperature remain poorly understood. This study demonstrated that IBA markedly promoted root initiation, elongation, and biomass under low temperature, and significantly increased the levels of phytohormones, including GA3, ABA, JA, IAA, and ZT, suggesting the activation of multiple signaling pathways. Transcriptome analysis revealed numerous differentially expressed genes related to metabolic pathways such as glycolysis, the tricarboxylic acid cycle, and glutathione metabolism. Weighted gene co-expression network analysis identified core gene modules correlated with phytohormone activities, highlighting their role in the IBA-mediated stress response. Eleven core genes, including GSTU6, FAR1, and BCAT3, and nine hub genes, such as Ub-CEP52-1 and ACS1, were identified as critical components for IBA-induced root development and stress mitigation. These findings provide insights into the molecular mechanisms underlying IBA-induced root development and stress tolerance in sugarcane, offering candidate genes for breeding high-yield, stress-tolerant varieties and demonstrating IBA's potential as a strategy to enhance productivity under challenging conditions.

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