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草业学报 ›› 2024, Vol. 33 ›› Issue (2): 93-111.DOI: 10.11686/cyxb2023117

• 研究论文 • 上一篇    下一篇

淹水胁迫下鸭茅根系基因差异表达及相关通路分析

曾兵1(), 尚盼盼1, 沈秉娜1, 王胤晨2, 屈明好1, 袁扬2, 毕磊1, 杨兴云1, 李文文1, 周晓丽1, 郑玉倩1, 郭文强1, 冯彦龙1, 曾兵1()   

  1. 1.西南大学动物科学技术学院,重庆 402460
    2.贵州省畜牧兽医研究所,贵州 贵阳 550000
    3.重庆高校草食动物工程研究中心,重庆 400715
  • 收稿日期:2023-04-11 修回日期:2023-06-29 出版日期:2024-02-20 发布日期:2023-12-12
  • 作者简介:曾兵(1998-),男,重庆人,在读硕士。E-mail: 1564501285@qq.com
    曾兵(1998-),男,重庆人,在读硕士。E-mail: 1564501285@qq.com
  • 基金资助:
    贵州林下养蜂提质增效关键技术集成与推广示范研究项目,重庆市现代农业产业技术体系(草食牲畜:CQMAITS202313)和西南大学大学生创新训练项目(X202310635206)

Differentially expressed genes and related pathways in root systems of Dactylis glomerata under flooding stress

Bing ZENG1(), Pan-pan SHANG1, Bing-na SHEN1, Yin-chen WANG2, Ming-hao QU1, Yang YUAN2, Lei BI1, Xing-yun YANG1, Wen-wen LI1, Xiao-li ZHOU1, Yu-qian ZHENG1, Wen-qiang GUO1, Yan-long FENG1, Bing ZENG1()   

  1. 1.College of Animal Science and Technology,Southwest University,Chongqing 402460,China
    2.Guizhou Institute of Animal Husbandry and Veterinary Medicine,Guiyang 550000,China
    3.Chongqing University Herbivore Engineering Research Center,Chongqing 400715,China
  • Received:2023-04-11 Revised:2023-06-29 Online:2024-02-20 Published:2023-12-12

摘要:

近年来我国南方地区洪涝灾害频繁发生,严重制约草牧业的发展。鸭茅作为重要的生态草种和优质牧草,耐淹性较差的特性严重影响其在频繁遭受洪涝区域的推广应用。本研究以国审品种“安巴”鸭茅为研究对象,对淹水胁迫0、8和24 h处理后的幼苗根系生理和转录等进行分析,以探究鸭茅在淹水胁迫下的响应机制。结果显示,淹水胁迫引起鸭茅根系中可溶性糖、可溶性蛋白和丙二醛含量显著增加,相对电导率先减少后显著升高。在淹水胁迫处理8 h后(相较于0 h),鸭茅根系中有5788个差异表达基因,包括上调基因2872个,下调基因2916个。胁迫处理24 h后,鸭茅根系中共有8807个差异表达基因,包括上调基因4123个,下调基因4684个。GO富集显示,这些差异表达基因功能主要涉及多糖代谢、微管结合、纤维素代谢过程、抗氧化反应等。KEGG富集显示,鸭茅根系主要通过苯丙烷生物合成、碳代谢、谷胱甘肽代谢、氨基酸生物合成、淀粉和蔗糖代谢以及糖酵解/糖异生等途径来响应淹水胁迫。进一步分析苯丙烷生物合成、碳代谢、谷胱甘肽代谢通路中的差异表达基因,推测 HXK1HXK2ADH1GSTAPX2等关键基因在鸭茅响应胁迫中发挥重要作用。MYB、NB-ARC、WRKY、GRAS和AP2等转录因子家族基因在淹水胁迫中表达丰富,可能与鸭茅的耐淹性密切相关。本研究结果为进一步探究鸭茅耐淹的分子机理提供了基础数据,也为后续的鸭茅耐淹性状改良工作提供理论支撑。

关键词: 鸭茅, 淹水胁迫, 根系, 转录组, 差异表达基因, 代谢通路

Abstract:

In recent years, flooding has occurred frequently in southern China, and has seriously restricted the development of grass and animal husbandry industries. Dactylis glomerata is an important ecological grass species and a high-quality forage. However, it has poor flooding tolerance, so it is seldom grown in areas that are frequently affected by flooding. In this study, to explore the flooding response mechanism of D. glomerata, the physiological indexes and gene expression patterns in the roots of seedlings of the D. glomerata cultivar ‘Anba’ were analyzed at 0, 8, and 24 hours of flooding stress. The results showed that the contents of soluble sugars, soluble protein, and malondialdehyde in the roots increased significantly under flooding stress, and the relative conductivity decreased initially and then increased significantly during the 24 hours flooding treatment. After 8 hours of flooding stress (compared with 0 hours), there were 5788 differentially expressed genes in the roots of D. glomerata, including 2872 up-regulated genes and 2916 down-regulated genes. After 24 hours of flooding stress, there were 8807 differentially expressed genes in the roots of D. glomerata, including 4123 up-regulated genes and 4684 down-regulated genes. Gene ontology enrichment analyses showed that these differentially expressed genes were mainly involved in polysaccharide metabolism, microtubule binding, cellulose metabolism, and the antioxidant response. The results of Kyoto Encyclopedia of Genes and Genomes enrichment analysis showed that the pathways responding to flooding in roots of D. glomerata were phenylpropanoid biosynthesis, carbon metabolism, glutathione metabolism, amino acid biosynthesis, starch and sucrose metabolism, and glycolysis/gluconeogenesis. Further analysis of differentially expressed genes involved in phenylpropanoid biosynthesis, carbon metabolism, and glutathione metabolism pathways suggested that HXK1HXK2ADH1GST, and APX2 encode products with important roles in the response of D. glomerata to flooding stress. Genes encoding MYB, NB-ARC, WRKY, GRAS, and AP2 transcription factors were highly expressed under flooding stress, suggesting that these transcription factors are closely related to flooding tolerance in D. glomerata. The results of this study provide basic data for further exploration of the molecular mechanism of flooding tolerance of D. glomerata, and also provide theoretical support for breeding to improve flooding tolerance.

Key words: Dactylis glomerata, flooding stress, roots, transcriptome, differentially expressed genes, metabolic pathway