ArticleInternational journal of molecular sciences2026
Physiological and Proteomic Analyses Reveal the Adaptive Mechanisms of Maize Genotypes Under Potassium Deficiency.
Article in International journal of molecular sciences, 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
Potassium (K) deficiency severely constrains maize productivity, yet the molecular mechanisms underlying genotypic differences in K tolerance remain poorly understood. A comparative physiological and iTRAQ-based quantitative proteomic analysis was conducted on two maize inbred lines with contrasting K-deficiency tolerance (Ktm, tolerant; Ksm, sensitive) following 3 days of K starvation (0 mM K), using roots as the primary analytical target. Physiological assessments revealed that under K deficiency, Ktm exhibited higher root vitality (Ktm decreased by 16.65% vs. Ksm by 31.54%) and larger root volume but lower electrolyte leakage compared with Ksm. Proteomic profiling identified 93 and 126 differentially abundant proteins (DAPs) in Ktm and Ksm, respectively. Integrative analysis indicated that Ktm responsed to K deprivation though coordinated downregulation of glycolytic enzymes, differential ROS accumulation with enhanced catalase (CAT) and peroxidase (POD) upregulation, and increased the abundances of cell wall-reinforcing proteins (dirigent proteins and cinnamyl alcohol dehydrogenase). In contrast, Ksm exhibited a less efficient stress response characterized by impaired ROS signaling, H
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