【摘要】 为探明水杨酸(SA)缓解镉胁迫下苎麻(Boehmeria nivea)生长生理的理论依据，本试验以苎麻品种中苎一号为供试材料，研究叶面喷施不同浓度SA(50、100、200μmol/L和400μmol/L)对镉胁迫下苎麻生长生理的影响。结果表明，与对照(CK)相比，镉胁迫抑制苎麻生长，降低生物量，降低光合色素含量、可溶性糖含量、可溶性蛋白含量和抗氧化酶活性且多达显著水平，丙二醛(MDA)含量和脯氨酸(Pro)含量显著增加。SA处理能有效缓解苎麻镉胁迫，并且SA对苎麻生长的缓解效果与其喷施浓度密切相关，过低或过高浓度的水杨酸会减弱对镉胁迫的缓解作用。浓度为100～200μmol/L时水杨酸的镉胁迫缓解效果最佳，苎麻生物量、光合色素含量、可溶性糖含量、可溶性蛋白含量及抗氧化酶活性增幅最大，MDA含量降幅最大，与镉胁迫处理(CD)相比苎麻根、茎、叶的镉含量最大降幅分别为34.62%、26.83%和52.31%。本研究得出的降低苎麻重金属镉胁迫的最佳SA浓度，可对苎麻的科学生产提供技术依据。更多还原

【Abstract】 In order to investigate the theoretical basis of salicylic acid(SA) in mitigating the growth and physiology of ramie(Boehmeria nivea) under cadmium stress, this experiment was conducted to analyze the effects of foliar spraying with different concentrations(50, 100, 200 μmol/L and 400 μmol/L) of SA on growth and physiology of ramie under cadmium stress using Zhongzhu No. 1 as test material. The results showed that compared with the control(CK), Cd stress inhibited the growth of ramie, reduced the biomass and contents of photosynthetic pigments, soluble sugars and soluble proteins and the activities of antioxidant enzymes, most of which up to significant level. The contents of malondialdehyde(MDA) and proline(Pro) increased significantly. Treated with SA could mitigate Cd stress to ramie effectively, and the mitigating effect of SA was closely related to its concentration, which could be weakened when the SA concentration was too low or too high. Salicylic acid at the concentration of 100～200 μmol/L had the best effect on the mitigation of Cd stress with the greatest increase in ramie biomass, contents of photosynthetic pigment, soluble sugars and soluble protein and antioxidant enzyme activity, and the greatest decrease in MDA content; the greatest decrease of Cd content in ramie roots, stems and leaves were 34.62%, 26.83% and 52.31%, respectively, compared with Cd stress treatment(CD). The optimal SA concentration to reduce the heavy metal cadmium stress in ramie derived from this study could provide a technical basis for the scientific production of ramie.更多还原