盐胁迫对长穗偃麦草根系分泌碳水化合物的影响

doi:10.11983/CBB25046

植物学报 ›› 2026, Vol. 61 ›› Issue (3): 437-448.DOI: 10.11983/CBB25046 cstr: 32102.14.CBB25046

盐胁迫对长穗偃麦草根系分泌碳水化合物的影响

衣从从¹^,²^,³, 李丹¹^,²^,³, 李彦颉¹^,²^,³, 林秀文¹^,²^,³, 卢英帅¹^,²^,³, 陈晓鹏¹^,²^,³^,^*()

¹ 山西农业大学草业学院 , 太谷 030801
² 草地生态保护与乡土草种质创新山西省重点实验室 , 太谷 030801
³ 山西右玉黄土高原草地生态系统国家定位观测研究站 , 右玉 037200

收稿日期:2025-03-24 接受日期:2025-09-02 出版日期:2026-05-10 发布日期:2025-09-05
通讯作者: 陈晓鹏
基金资助:
国家自然科学基金(32271682); 山西省高等学校大学生创新创业训练计划(202310113004)

Effect of Salt Stress on Carbohydrate Secretion by the Root System of Thinopyrum ponticum

Congcong Yi¹^,²^,³, Dan Li¹^,²^,³, Yanjie Li¹^,²^,³, Xiuwen Lin¹^,²^,³, Yingshuai Lu¹^,²^,³, Xiaopeng Chen¹^,²^,³^,^*()

¹ College of Grassland Science, Shanxi Agricultural University , Taigu 030801, China
² Shanxi Key Laboratory of Grassland Ecological Protection and Native Grass Germplasm Innovation , Taigu 030801, China
³ Youyu Loess Plateau Grassland Ecosystem National Research Station , Youyu 037200, China

Received:2025-03-24 Accepted:2025-09-02 Online:2026-05-10 Published:2025-09-05
Contact: Xiaopeng Chen

摘要/Abstract

摘要： 植物根系分泌的碳水化合物影响土壤微生物的碳源供给与代谢活性。为揭示耐盐植物根系分泌碳水化合物对盐胁迫强度的响应机制, 以耐盐牧草长穗偃麦草( Thinopyrum ponticum)为研究对象, 设置对照、轻度、中度和重度(土壤含盐量分别为0%、0.2%、0.4%和0.6%)四个盐(NaCl)胁迫强度, 采用非靶向代谢组学技术解析根系分泌碳水化合物的组成变化, 并探究其与根际土壤理化性质的关系。结果表明: (1) 与对照相比, 盐胁迫显著降低糖苷、氨基糖苷、D-氨基葡萄糖、2-O-甲基-L-岩藻糖及半乳糖苷5类碳水化合物的含量, 而显著增加葡萄糖含量; (2) 长穗偃麦草根系分泌的主要碳水化合物为糖苷, 相对丰度占比达(79.63±8.19)%, 其余5类化合物占比在(3.40±0.53)%–(4.57±1.61)%之间; (3) 轻度、中度和重度盐胁迫下根系分泌碳水化合物与对照相比均存在显著差异, 但轻度、中度、重度处理间无显著差异; (4) 根际土壤电导率和硝态氮含量是5类碳水化合物丰度下调的关键因素, 而土壤pH值是葡萄糖丰度上调的关键因素。综上, 长穗偃麦草可通过调节根系分泌碳水化合物的含量适应盐胁迫环境, 且这种调节作用与根际土壤理化性质密切相关。

关键词: 盐渍化, 根系分泌物, 长穗偃麦草, 碳水化合物

Abstract: INTRODUCTION: The carbohydrates secreted by plant roots play a crucial role in modulating the carbon source supply and metabolic activity of soil microorganisms. RATIONALE: In order to unveil the response mechanism of root-secreted carbohydrates in salt-tolerant plants to the intensity of salt stress, this study focused on the salt-tolerant forage grass Thinopyrum ponticum. Four levels of salt stress intensity were conducted by adding NaCl, including control, light, moderate, and heavy stress conditions (with soil salt contents of 0%, 0.2%, 0.4%, and 0.6%, respectively). Untargeted metabolomics techniques were employed to analyze the compositional alterations of root-secreted carbohydrates and their correlations with the rhizosphere soil properties were evaluated. RESULTS: The results demonstrated that: (1) Compared to the control, salt stress significantly decreased the contents of five types of carbohydrates, namely glycoside, aminoglycoside, D-glucosamine, 2-O-methyl-L-fucose and galactoside, while markedly increasing glucose content; (2) Glycosides were the predominant carbohydrates secreted by T. ponticum roots, accounting for (79.63±8.19)% of the total relative abundance, whereas the remaining five carbohydrate types ranged from (3.40±0.53)% to (4.57±1.61)%; (3) Root-secreted carbohydrates exhibited significant differences between the control and light, moderate, or heavy salt stress treatments, but no significant distinctions were observed among the latter three treatments; (4) Soil electrical conductivity and nitrate nitrogen content were identified as key factors responsible for the down-regulation of the five carbohydrate types, while soil pH was the primary factor driving the up-regulation of glucose. CONCLUSION: T. ponticum can adapt to salt-stressed environments by regulating the content of carbohydrates secreted by its roots. Meanwhile, the abundance of carbohydrates secreted by the roots is also influenced by the soil properties.

Key words: salinization, root exudates, Thinopyrum ponticum, carbohydrates

衣从从, 李丹, 李彦颉, 林秀文, 卢英帅, 陈晓鹏. 盐胁迫对长穗偃麦草根系分泌碳水化合物的影响. 植物学报, 2026, 61(3): 437-448.

Congcong Yi, Dan Li, Yanjie Li, Xiuwen Lin, Yingshuai Lu, Xiaopeng Chen. Effect of Salt Stress on Carbohydrate Secretion by the Root System of Thinopyrum ponticum. Chinese Bulletin of Botany, 2026, 61(3): 437-448.

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盐胁迫对长穗偃麦草根系分泌碳水化合物的影响

Effect of Salt Stress on Carbohydrate Secretion by the Root System of Thinopyrum ponticum

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