Exogenous Ethylene Promotes the Germination of Cotton Seeds Under Salt Stress

Li, Haipeng; Sun, Huimin; Ping, Wenchao; Liu, Liantao; Zhang, Yongjiang; Zhang, Ke; Bai, Zhiying; Li, Anchang; Zhu, Jijie; Li, Cundong

doi:10.1007/s00344-022-10859-z

Cited by 9 publications

(15 citation statements)

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“…Among these, NaCl was a primary salt contributing to soil salinization, and current research on plant salt stress mainly utilizes NaCl to simulate salt stress [ 2 , 3 , 17 ]. High concentrations of NaCl (150 mM) inhibit the activity of hydrolytic enzymes during the cotton seed germination phase, resulting in insufficient energy supply for seed germination, consequently reducing the index of cotton seed germination and significantly lowering the germination rate [ 3 , 7 , 8 ]. Although under the same salt stress conditions (150 mM NaCl) the germination rates of different cotton cultivars showed significant decreases, the extent of reduction varies.…”

Section: Discussionmentioning

confidence: 99%

“…Although under the same salt stress conditions (150 mM NaCl) the germination rates of different cotton cultivars showed significant decreases, the extent of reduction varies. For instance, the reduction in the ‘Nongda Cotton 601’ cultivar was 50% [ 8 ], while the ‘GXM9’ cultivar experiences an 18% reduction [ 7 ]. In this study, the reduction rates for the ‘Tahe 2’ and ‘Xinluzhong 62’ cultivars were 20.34% and 32.14%, respectively.…”

Section: Discussionmentioning

confidence: 99%

“…In this environmental context, cotton ( Gossypium spp. ), as a moderately salt-tolerant crop and a globally significant economic crop, plays a crucial role in the agricultural economy of regions affected by soil salinization [ 4 , 5 , 6 , 7 , 8 ]. However, excessively high salt levels in the soil have varying degrees of negative effects on the entire growth period of cotton, especially during the germination and seedling stages, where cotton is more sensitive to salt stress [ 4 , 8 ].…”

Section: Introductionmentioning

confidence: 99%

“…), as a moderately salt-tolerant crop and a globally significant economic crop, plays a crucial role in the agricultural economy of regions affected by soil salinization [ 4 , 5 , 6 , 7 , 8 ]. However, excessively high salt levels in the soil have varying degrees of negative effects on the entire growth period of cotton, especially during the germination and seedling stages, where cotton is more sensitive to salt stress [ 4 , 8 ]. Salt inhibits the absorption of water and nutrients by cotton seeds and seedling roots, leading to the uptake of large amounts of salts, such as Na + and Cl − , resulting in adverse effects such as osmotic stress, ion toxicity, and oxidative stress [ 3 , 8 ].…”

Section: Introductionmentioning

confidence: 99%

“…However, excessively high salt levels in the soil have varying degrees of negative effects on the entire growth period of cotton, especially during the germination and seedling stages, where cotton is more sensitive to salt stress [ 4 , 8 ]. Salt inhibits the absorption of water and nutrients by cotton seeds and seedling roots, leading to the uptake of large amounts of salts, such as Na + and Cl − , resulting in adverse effects such as osmotic stress, ion toxicity, and oxidative stress [ 3 , 8 ]. This poses the challenge of ‘difficult emergence and seedling protection’ when cultivating cotton in saline–alkali soil.…”

Section: Introductionmentioning

confidence: 99%

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Exogenous γ-Aminobutyric Acid Can Improve Seed Germination and Seedling Growth of Two Cotton Cultivars under Salt Stress

Dong,

Huang,

et al. 2023

Plants

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Excessive salt content in soil has adverse effects on cotton production, especially during the germination and seedling stages. γ-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 10.64~23.40% and 2.63~31.58% 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 20.44~28.08% and 29.54~76.33% 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.

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