关键词: 关键词：盐胁迫, 稀土半胱氨酸螯合物, 黄瓜, 种子萌发, 幼苗生长

Abstract: Abstract：The aim of this study was to investigate the effects of rare earth chelates on cucumber seed germination and seedling growth under salt stress．By using lanthanum nitrate，cysteine and cysteinelanthanum as test materials，in-dish germination tests and pot growth tests were conducted under salt stress environment simulated by NaCl solution．The results showed that salt stress signifi cantly inhibited cucumber seed germination and seedling growth，while cysteine-lanthanum chelate significantly alleviated salt stress and improved seed germination and seedling growth indexes，which were not significantly different from those of the no-salt stress treatment．Specific data showed that lanthanum cysteine-treated cucumber seed germination under salt stress increased by 10.9%，and the aboveground fresh weight of seedlings increased by 34.5% and the belowground fresh weight by 25.1%．In addition，cysteine-lanthanum effectively alleviated the antioxidant systems of cucumber seedlings under salt stress，such as malondialdehyde，superoxide dismutase，peroxidase，and catalase by 27.9%，33.9%，31.1%，and 37.0%，respectively，which resulted in the enhancement of plant resilience．Thus，cysteine-lanthanum has a promising application as an eff ective salt stress reliever to enhance the growth potential of cucumber under salt-stressed environments.

Key words: Keywords：salt stress, rare earth cysteine chelates, cucumber, seed germination, seedling growth