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Exogenous silicon induces aluminum tolerance in white clover (Trifolium repens) by reducing aluminum uptake and enhancing organic acid secretion.
Yang, Weiqiang; Feng, Huahao; Zhou, Jianzhen; Jia, Tong; Tang, Tao; Zhang, Han; Peng, Yan.
Afiliación
  • Yang W; College of Grassland Science and Technology, Sichuan Agricultural University, Sichuan Province, Chengdu, China.
  • Feng H; College of Grassland Science and Technology, Sichuan Agricultural University, Sichuan Province, Chengdu, China.
  • Zhou J; College of Grassland Science and Technology, Sichuan Agricultural University, Sichuan Province, Chengdu, China.
  • Jia T; College of Grassland Science and Technology, Sichuan Agricultural University, Sichuan Province, Chengdu, China.
  • Tang T; College of Grassland Science and Technology, Sichuan Agricultural University, Sichuan Province, Chengdu, China.
  • Zhang H; College of Grassland Science and Technology, Sichuan Agricultural University, Sichuan Province, Chengdu, China.
  • Peng Y; College of Grassland Science and Technology, Sichuan Agricultural University, Sichuan Province, Chengdu, China.
PeerJ ; 12: e17472, 2024.
Article en En | MEDLINE | ID: mdl-38827280
ABSTRACT
Excessive aluminum (Al) in acidic soils is a primary factor that hinders plant growth. The objective of the present study was to investigate the effect and physiological mechanism of exogenous silicon (Si) in alleviating aluminum toxicity. Under hydroponic conditions, 4 mM Al significantly impeded the growth of white clover; however, pretreatments with 1 mM Si mitigated this inhibition, as evidenced by notable changes in growth indicators and physiological parameters. Exogenous silicon notably increased both shoot and root length of white clover and significantly decreased electrolyte leakage (EL) and malondialdehyde (MDA) content compared to aluminum treatments. This positive effect was particularly evident in the roots. Further analysis involving hematoxylin staining, scanning electron microscopy (SEM), and examination of organic acids (OAs) demonstrated that silicon relieved the accumulation of bioactive aluminum and ameliorated damage to root tissues in aluminum-stressed plants. Additionally, energy-dispersive X-ray (EDX) analysis revealed that additional silicon was primarily distributed in the root epidermal and cortical layers, effectively reducing the transport of aluminum and maintaining the balance of exchangeable cations absorption. These findings suggest that gradual silicon deposition in root tissues effectively prevents the absorption of biologically active aluminum, thereby reducing the risk of mineral nutrient deficiencies induced by aluminum stress, promoting organic acids exudation, and compartmentalizing aluminum in the outer layer of root tissues. This mechanism helps white clover alleviate the damage caused by aluminum toxicity.
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Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Asunto principal: Silicio / Raíces de Plantas / Trifolium / Aluminio Idioma: En Revista: PeerJ Año: 2024 Tipo del documento: Article País de afiliación: China Pais de publicación: Estados Unidos
Texto completo
Añadir a Mi BVS
Imprimir
XML
PubMed Links
Buscar en Google

Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Asunto principal: Silicio / Raíces de Plantas / Trifolium / Aluminio Idioma: En Revista: PeerJ Año: 2024 Tipo del documento: Article País de afiliación: China Pais de publicación: Estados Unidos