中国农学通报2025，Vol.41Issue(29)：24-29,6.
外源褪黑素对镉胁迫下向日葵种子萌发及幼苗生长的影响
Effects of Exogenous Melatonin on Seed Germination and Seedling Growth of Helianthus annuus Under Cadmium Stress
摘要
Abstract
To illustrate the mitigating effect of the melatonin(MT)on the heavy metal cadmium(Cd),Helianthus annuus was used as the test material to study the effect of exogenous MT on seed germination,seedling growth and leaf tissue structure under Cd stress by means of seed imbibition,foliar spraying and conventional paraffin sectioning.The results showed that soaking seeds with 200 µmol/L MT significantly increased the germination rate and germination potential.Under Cd stress,a 400 µmol/L MT treatment significantly improved the growth indicators such as plant height,root length,leaf length,leaf width,and the physiological indicators such as SOD,POD,CAT and the content of soluble protein,but the content of MDA was significantly decreased.By analyzing the microscopic structure of leaves,the leaf thickness,upper and lower epidermis cell thickness,palisade tissue thickness,cell tense ratio and ratio of palisade tissue to spongy tissue were significantly increased by exogenous application of 200 µmol/L MT.However,the spongy tissue thickness and the spongy ratio were significantly decreased.The above results indicated that the appropriate concentration of exogenous MT could effectively alleviate the seed germination and seedling growth of Helianthus annuus under Cd stress,and enhanced the Cd tolerance.关键词
褪黑素/镉胁迫/向日葵/种子萌发/幼苗生长/生理特性/显微结构Key words
melatonin/cadmium stress/Helianthus annuus/seed germination/seedling growth/physiological characteristics/microstructure分类
农业科技引用本文复制引用
王美艳,翟明慧,袁龙,李冰冰,郭高杰,朱亚祺,王荣杰,丁瑞瑞..外源褪黑素对镉胁迫下向日葵种子萌发及幼苗生长的影响[J].中国农学通报,2025,41(29):24-29,6.基金项目
2024年度青岛农业大学海都学院教学改革研究项目(JY202417) （JY202417）
2024年度青岛农业大学海都学院大学生创新训练项目(CXCY202401012) （CXCY202401012）
2024年青岛农业大学海都学院科研项目(KY2024002). （KY2024002）
