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<p>Salinity stress is a major constraint to mung bean production, and the integrated effects of silicon on root architecture, gene expression, and proteomic responses remain poorly understood. A greenhouse experiment was conducted using four mung bean varieties subjected to sodium metasilicate supplementation under progressive NaCl stress (0, 10, and 20&#xa0;mM), integrating root system architecture, proteomic profiling, and gene expression analyses. The most silicon-responsive genotype was identified based on silicon accumulation patterns and advanced for in depth molecular analyses. Silicon supplementation was associated with improved root architectural recovery under salinity stress, with enhanced root surface area observed across tolerant varieties. Correlative changes in ionic balance were observed, with silicon-supplemented plants showing lower Na⁺/K⁺ and Na⁺/Ca<sup>2</sup>⁺ ratios compared with non-supplemented salt-stressed plants. Silicon transporter genes (<i>Lsi1</i> (sevenfold) and <i>Lsi2</i> (3.4-fold), and salt-responsive genes <i>SOS1</i> (3.6-fold), <i>SOS2</i> (1.6-fold), <i>SOS3</i> (2.8-fold) were positively associated with silicon supplementation under saline conditions, suggesting correlative links between silicon uptake and ionic stress-responsive pathways. Exploratory proteomic profiling identified 23 differentially expressed proteins associated with photosynthetic and stress-response pathways, with silicon-supplemented plants showing higher proportions of photosynthesis-related and antioxidant proteins. PCA biplot (49.6%) revealed distinct clustering of silicon-supplemented treatments, positively associated with root architectural traits and negatively associated with Na⁺/K⁺ and Na⁺/Ca<sup>2</sup>⁺ ratios. Collectively, these correlative findings suggest that silicon supplementation is associated with coordinated morphological and molecular adjustments in mung beans under salinity stress, though future mechanistic studies employing higher-resolution platforms are suggested.</p>

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Silicon-mediated molecular and physiological mechanisms confer variety-specific salt tolerance in mung bean (Vigna radiata, Fabaceae)

  • 期刊论文

  • 发表日期：

    2026年8月3日

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  • Sushilkumar Sadhanandan,
  • Sowbiya Muneer

摘要

Salinity stress is a major constraint to mung bean production, and the integrated effects of silicon on root architecture, gene expression, and proteomic responses remain poorly understood. A greenhouse experiment was conducted using four mung bean varieties subjected to sodium metasilicate supplementation under progressive NaCl stress (0, 10, and 20 mM), integrating root system architecture, proteomic profiling, and gene expression analyses. The most silicon-responsive genotype was identified based on silicon accumulation patterns and advanced for in depth molecular analyses. Silicon supplementation was associated with improved root architectural recovery under salinity stress, with enhanced root surface area observed across tolerant varieties. Correlative changes in ionic balance were observed, with silicon-supplemented plants showing lower Na⁺/K⁺ and Na⁺/Ca2⁺ ratios compared with non-supplemented salt-stressed plants. Silicon transporter genes (Lsi1 (sevenfold) and Lsi2 (3.4-fold), and salt-responsive genes SOS1 (3.6-fold), SOS2 (1.6-fold), SOS3 (2.8-fold) were positively associated with silicon supplementation under saline conditions, suggesting correlative links between silicon uptake and ionic stress-responsive pathways. Exploratory proteomic profiling identified 23 differentially expressed proteins associated with photosynthetic and stress-response pathways, with silicon-supplemented plants showing higher proportions of photosynthesis-related and antioxidant proteins. PCA biplot (49.6%) revealed distinct clustering of silicon-supplemented treatments, positively associated with root architectural traits and negatively associated with Na⁺/K⁺ and Na⁺/Ca2⁺ ratios. Collectively, these correlative findings suggest that silicon supplementation is associated with coordinated morphological and molecular adjustments in mung beans under salinity stress, though future mechanistic studies employing higher-resolution platforms are suggested.