文献类型： 外文期刊

作者： Dong, Zhiduo ¹ ; Huang, Jian ² ; Qi, Tong ² ; Meng, Ajing ² ; Fu, Qiuping ¹ ; Fu, Yanbo ² ; Xu, Fei ² ;

作者机构： 1.Xinjiang Agr Univ, Coll Water Conservancy & Civil Engn, Urumqi 830052, Peoples R China

2.Xinjiang Acad Agr Sci, Inst Soil Fertilizer, Agr Water Saving, Urumqi 830091, Peoples R China

3.Minist Agr & Rural Affairs, Key Lab Saline Alkali Soil Improvement & Utilizat, Urumqi 830091, Peoples R China

4.China Agr Univ, Coll Land Sci & Technol, Beijing 100193, Peoples R China

5.Natl Soil Qual Aksu Observat Expt Stn, Aksu 843000, Peoples R China

关键词： ion content; Gossypium; osmoregulation; oxidative stress

期刊名称：PLANTS-BASEL （ 影响因子：4.5； 五年影响因子：4.8 ）

ISSN： 2223-7747

年卷期： 2024 年 13 卷 1 期

页码：

收录情况： SCI

摘要： Excessive salt content in soil has adverse effects on cotton production, especially during the germination and seedling stages. gamma-aminobutyric acid (GABA) is an important active substance that is expected to improve the resistance of plants to abiotic stresses. This study focused on two cotton cultivars (Gossypium hirsutum L.: Tahe 2 and Xinluzhong 62) and investigated the impact of exogenous GABA (0, 1, 2, 3, and 4 mM) on seed germination, seedling growth, and related morphological, physiological, and biochemical indicators under salt stress (150 mM NaCl). The results showed that salt stress significantly reduced the germination rate and germination index of cotton seeds (decreased by 20.34% and 32.14% for Tahe 2 and Xinluzhong 62, respectively), leading to decreased seedling height and biomass and causing leaf yellowing. Salt stress induced osmotic stress in seedlings, resulting in ion imbalance (marked reduction in K+/Na+ ratio) and oxidative damage. Under salt stress conditions, exogenous GABA increased the germination rate (increased by 10.64 similar to 23.40% and 2.63 similar to 31.58% for Tahe 2 and Xinluzhong 62, respectively) and germination index of cotton seeds, as well as plant height and biomass. GABA treatment improved leaf yellowing. Exogenous GABA treatment increased the content of proline and soluble sugars, with varying effects on betaine. Exogenous GABA treatment reduced the Na+ content in seedlings, increased the K+ content, and increased the K+/Na+ ratio (increased by 20.44 similar to 28.08% and 29.54 similar to 76.33% for Tahe 2 and Xinluzhong 62, respectively). Exogenous GABA treatment enhanced the activities of superoxide dismutase and peroxidase, and reduced the accumulation of hydrogen peroxide and malondialdehyde, but had a negative impact on catalase activity. In conclusion, exogenous GABA effectively improved cotton seed germination. By regulating osmoprotectant levels, maintaining ion homeostasis, and alleviating oxidative stress, GABA mitigated the adverse effects of salt stress on cotton seedling growth.