数字农科院2.0

Synergistic Effects of Salt-Tolerant PGPR and Foliar Silicon on Pak Choi Antioxidant Defense Under Salt Stress

文献类型： 外文期刊

作者： Zhao, Jieru;Han, Qibiao;Cui, Bingjian;Wang, Juan;Hu, Chao;Li, Rui;Lin, Yanyu;Xu, Ying;Liu, Chuncheng

作者机构：

关键词： antioxidant enzyme activation;osmolyte accumulation;hormonal regulation;principal component analysis;sustainable saline agriculture

期刊名称： PLANTS-BASEL

ISSN： 2223-7747

年卷期： 2025 年 14 卷 13 期

页码：

收录情况： SCIE（2025版）

摘要： Salinization severely impairs crop growth by inducing oxidative stress and disrupting cellular homeostasis. This study systematically investigates the synergistic effects of salt-tolerant plant-growth-promoting rhizobacteria (ST-PGPR) and foliar silicon fertilizer spraying (FSFS) on antioxidant responses in Pak choi under salt stress. Two-season pot experiments were carried out to evaluate key indicators, including antioxidant enzyme activities (superoxide dismutase: SOD; peroxidase: POD; catalase: CAT), oxidative stress (malondialdehyde: MDA), osmolyte accumulation (proline, soluble protein), and hormones (Jasmonic Acid: JA; Salicylic Acid: SA; Abscisic acid: ABA). The results demonstrate that combining ST-PGPR with FSFS significantly enhances SOD (6.18-2353.85%), POD (3.44-153.29%), and CAT (25.71-319.29%) activities while reducing MDA content (8.12-35.87%). Proline and soluble protein levels increased by 1.56-15.71% and 5.03-188.87%, respectively. Hormonal regulation increased JA, SA, and ABA levels by 1.05-31.81%, 2.09-34.29%, and 3.18-30.09%, respectively. Notably, ST-PGPR treatments at 104 and 106 cfumL-1, combined with foliar silicon application, consistently ranked highest in overall antioxidant performance across both seasons based on a principal component analysis. These findings provide novel insights into microbial-mineral interactions for sustainable saline agriculture.

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