Synergistic Effects of Salicylic Acid and Bacillus butanolivorans KJ40 for Enhancing Napa Cabbage (Brassica napa subsp. pekinensis) Resilience to Water-Deficit Stress

Horticulturae Pub Date : 2024-06-10 DOI:10.3390/horticulturae10060618

Sang Tae Kim, M. Sang

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Abstract

Climate change exacerbates drought, globally impacting crop production and necessitating the adoption of sustainable strategies. This study investigates the potential synergistic effects of salicylic acid (SA) and Bacillus butanolivorans KJ40 (KJ40) on napa cabbage (Brassica rapa subsp. pekinensis) under water-deficit stress conditions by watering withheld for five days. Results demonstrate that the combined application of KJ40 and SA, particularly at concentrations of 0.5 mM and 1 mM, significantly enhances plant growth and mitigates the negative impacts of water deficit. Moreover, the combination treatment with SA (0.5 mM) and KJ40 (1 × 108 cells/mL) reduces lipid oxidation and enhances antioxidant enzyme activity, indicating improved plant stress tolerance. Analysis of soil microbial profiles reveals alterations in metabolic activity and substrate utilization patterns, suggesting potential changes in rhizosphere dynamics. Additionally, this study examines the impact of SA on KJ40 population dynamics in soil, revealing concentration-dependent effects on bacterial survival. Overall, the combination of KJ40 and SA was effective in mitigating water-deficit stress in napa cabbage. These findings highlight the combination as a novel synergistic strategy to enhance plant resilience to water-deficit stress, offering insights into plant–microbe interactions and soil ecosystem dynamics.

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水杨酸与丁醇杆菌 KJ40 的协同作用可增强纳帕甘蓝（Brassica napa subsp.

气候变化加剧了干旱，对全球作物生产造成影响，因此必须采取可持续战略。本研究调查了水杨酸（SA）和丁醇杆菌 KJ40（KJ40）对缺水胁迫条件下的纳帕甘蓝（Brassica rapa subsp.结果表明，联合施用 KJ40 和 SA（尤其是浓度为 0.5 mM 和 1 mM 时）能显著促进植物生长，减轻缺水的负面影响。此外，SA（0.5 毫摩尔）和 KJ40（1 × 108 个细胞/毫升）的联合处理可减少脂质氧化，提高抗氧化酶活性，从而提高植物的抗逆性。对土壤微生物剖面的分析表明，代谢活动和底物利用模式发生了变化，这表明根圈动力学可能发生了变化。此外，本研究还探讨了 SA 对土壤中 KJ40 种群动态的影响，揭示了浓度对细菌存活率的影响。总体而言，KJ40 和 SA 的组合能有效缓解油菜的缺水胁迫。这些发现凸显了这一组合是一种新型的协同策略，可增强植物对缺水胁迫的恢复能力，为植物与微生物的相互作用和土壤生态系统动力学提供了启示。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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Horticulturae

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