稀土半胱氨酸螯合物对盐胁迫下黄瓜种子萌发和幼苗生长的影响

Eff ect of Rare Earth Cysteine Chelates on Seed Germination and Seedling Growth of Cucumber under Salt Stress

为探究稀土螯合物对盐胁迫下黄瓜种子萌发和幼苗生长的影响,以硝酸镧、半胱氨酸和半胱氨酸-镧作为试验材料,在NaCl溶液模拟的盐胁迫环境下进行培养皿发芽试验和盆栽生长试验。结果表明,盐胁迫显著抑制了黄瓜种子的发芽和幼苗的生长,而半胱氨酸-镧螯合物能显著缓解盐胁迫,提高种子发芽率和幼苗生长指标,与无盐胁迫处理无显著差异。半胱氨酸-镧处理的盐胁迫下黄瓜种子发芽率提高了10.9%,幼苗的地上部鲜质量增加了34.5%,地下部鲜质量增加了25.1%。此外,半胱氨酸-镧还能有效缓解盐胁迫下黄瓜幼苗的抗氧化系统,如丙二醛含量和超氧化物歧化酶、过氧化物酶、过氧化氢酶活性分别缓解了27.9%、33.9%、31.1%、37.0%,从而增强植物的抗逆性。因此,半胱氨酸-镧作为一种有效的盐胁迫缓解剂,具有提高黄瓜在盐胁迫环境下生长潜力的应用前景。

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 cysteine-lanthanum 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 significantly 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 effective salt stress reliever to enhance the growth potential of cucumber under salt-stressed environments.