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<p>With the promotion of sustainable agricultural practices, reducing fertilizer application has become a necessary trend. Potassium is an essential mineral element for potato growth and development, and GABA, as a plant growth regulator, is considered to be able to alleviate abiotic stress. In this study, the effect of this method on potato growth was explored by simulating the environment of potassium fertilizer application reduction and combining GABA treatment. To reduce potassium fertilizer application, an appropriate concentration of GABA was sprayed on the leaves of potted potato plants, which significantly alleviated potassium deficiency stress. In the potted potato experiment, three potassium fertilizer rates were applied: A1 (225&#xa0;kg/ha), A2 (112.5&#xa0;kg/ha, 1/2K), and A3 (56.25&#xa0;kg/ha, 1/4K), along with two foliar treatments: B1 (water) and B2 (5 mM GABA). Under different potassium conditions(A1, A2, A3), after foliar application of 5 mM GABA: the tuber starch content increased by 5.00%, 12.10%, and 20.77%, respectively; potato yield increased by 20.08%, 39.90%, and 2.50%, respectively; and reducing sugar content decreased by 11.11%, 10.20%, and 11.32%, respectively. Non-targeted LC-MS metabolomics was performed on harvested potatoes from different treatments, and 114 metabolites with differential abundance were detected between A3B2 and A3B1, with 110 pathways annotated. The main metabolites with differential abundance included malic acid, L-glutamine, isoleucine, and L-glutamate.</p>

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Mechanism by Which Exogenous GABA Enhances the Tolerance of Potatoes to Low-Potassium Conditions

  • 期刊论文

  • 发表日期：

    2025年11月10日

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  • Fengjuan Wang,
  • Ruijie Zuo,
  • Shang Shi,
  • Junrong Cheng,
  • Yifei Lu,
  • Bi Ren,
  • Liming Lu,
  • Liqin Li

摘要

With the promotion of sustainable agricultural practices, reducing fertilizer application has become a necessary trend. Potassium is an essential mineral element for potato growth and development, and GABA, as a plant growth regulator, is considered to be able to alleviate abiotic stress. In this study, the effect of this method on potato growth was explored by simulating the environment of potassium fertilizer application reduction and combining GABA treatment. To reduce potassium fertilizer application, an appropriate concentration of GABA was sprayed on the leaves of potted potato plants, which significantly alleviated potassium deficiency stress. In the potted potato experiment, three potassium fertilizer rates were applied: A1 (225 kg/ha), A2 (112.5 kg/ha, 1/2K), and A3 (56.25 kg/ha, 1/4K), along with two foliar treatments: B1 (water) and B2 (5 mM GABA). Under different potassium conditions(A1, A2, A3), after foliar application of 5 mM GABA: the tuber starch content increased by 5.00%, 12.10%, and 20.77%, respectively; potato yield increased by 20.08%, 39.90%, and 2.50%, respectively; and reducing sugar content decreased by 11.11%, 10.20%, and 11.32%, respectively. Non-targeted LC-MS metabolomics was performed on harvested potatoes from different treatments, and 114 metabolites with differential abundance were detected between A3B2 and A3B1, with 110 pathways annotated. The main metabolites with differential abundance included malic acid, L-glutamine, isoleucine, and L-glutamate.