数字农科院2.0

Physiological differences between Mo17 and B73 maize inbred lines under salt stress

文献类型： 外文期刊

作者： Zhang, Shujie;Wen, Xinyue;Zhou, Guangshun;Cui, Pengjuan;Li, Fang;Han, Yanlai;Wang, Yi

作者机构：

关键词： Oxidative damage;plant growth;salt stress;Zea mays L;ion balance

期刊名称： NEW ZEALAND JOURNAL OF BOTANY

ISSN： 0028-825X

年卷期： 2025 年

页码：

收录情况： SCIE（2025版）

摘要： This study delves into the key physiological adaptations of maize inbred lines with varying salt tolerance levels, aiming to unravel their core response mechanisms to salt stress. Utilising a hydroponic system with 150 mM NaCl as the stressor, we observed pronounced growth inhibition in maize, marked by reduced biomass and plant height, with Mo17 exhibiting superior tolerance over B73. Genotype-NaCl interactions significantly modulated K+/Na+ ratio, malondialdehyde (MDA), hydrogen peroxide (H2O2) levels, and antioxidant enzyme activities. Notably, salt stress triggered Na+ accumulation while diminishing K+ content, yet Mo17 maintained a higher K+/Na+ ratio in roots, indicative of efficient ion homeostasis. Furthermore, Mo17 exhibited lower MDA and H2O2 contents and higher peroxidase (POD) activity, suggesting enhanced oxidative stress resilience. Regression analysis highlighted the positive correlation between shoot biomass and K+/Na+ ratio, POD activity, and negative relationship with MDA and H2O2. Random forest modelling confirmed K+/Na+ and MDA as pivotal factors influencing maize biomass. In conclusion, salt tolerant maize varieties harness high K+/Na+ ratio to mitigate salt ion toxicity, bolster antioxidant defenses, minimise MDA production, and thereby reveal crucial physiological hallmarks of salt tolerance.

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