Abstract: Abstract：Arbuscular mycorrhizal fungi（AMF）can enhance the host plant’s tolerance to cadmium （Cd）．However，the impact of AMF on Cd uptake in crops with different Cd accumulation types is still unclear．Under Cd stress，the sand culture method was used to study the eff ects of AMF inoculation on growth indicators，root morphology，xylem sap Cd concentration，and root Cd ion fl ow velocity in diff erent varieties of peppers．Two inoculation levels，inoculation（Fm）and non-inoculation（CK）were applied to high Cd accumulation pepper variety‘Layan 101’and low Cd accumulation pepper variety‘Layan 201’．The results showed that，under Cd stress，AMF promoted the growth of peppers．Compared with CK，AMF signifi cantly increased the dry weight of pepper roots，with‘Layan 101’and‘Layan 201’increasing by 99.71% and82.61%，respectively．The above ground dry weight of‘Layan 201’and the total root length，root surface area，root volume，and average root diameter of‘Layan 101’all signifi cantly increased．The concentration of Cd in the wound fl uid of the two pepper varieties was found to decrease，with the greatest reduction observed at 30 days．Cd concentrations in‘Layan 101’and‘Layan 201’decreased by 32.12% and 45.83%，respectively．The average fl ow velocity of Cd2+ in the root systems also decreased signifi cantly，with a greater reduction observed in‘Layan 101’（81.8%）compared to‘Layan 201’（77.2%）．The absorption of Cd by the root systems of the two pepper varieties was inhibited by AMF，with a stronger inhibitory eff ect observed on the Cd high accumulation variety‘Layan 101’compared to the Cd low accumulation variety‘Layan 201’．

Key words: Keywords：arbuscular mycorrhizal fungi, peppers, variety, cadmium, fi xation

摘要： 摘 要：丛枝菌根真菌（arbuscular mycorrhizal fungi，AMF）可增强宿主植物对镉（cadmium，Cd）的耐受性。然而，AMF对不同Cd 积累型作物Cd 吸收的影响尚不清楚。采用沙培方法，在Cd 胁迫下，以Cd 高积累型辣椒品种辣研101 和Cd 低积累型辣椒品种辣研201 为研究对象，设置2 个接菌水平，即接菌（Fm）和不接菌（CK），研究接种AMF 对不同Cd 积累型辣椒品种生长指标、根系形态指标、木质部伤流液Cd 浓度、根系Cd 离子流速的影响。结果表明：Cd 胁迫下，接种AMF 促进了辣椒生长。与CK 相比，接种AMF 使得辣椒根系干质量显著增加，辣研101、辣研201 分别提高了99.71%、82.61%；辣研201 的地上部干质量及辣研101 的总根长、根表面积、根体积、根系平均直径均显著增加。两个辣椒品种伤流液Cd 浓度均呈下降趋势，在30 d 时降幅最大，辣研101、辣研201 分别下降32.12%、45.83%；根系Cd2+ 平均流速也大幅下降，且辣研101 降低幅度（81.8%）大于辣研201（77.2%）。AMF 可抑制两个辣椒品种根系对Cd 的吸收，且对Cd 高积累型品种 辣研101 的抑制效果强于Cd 低积累型品种辣研201。

关键词: 关键词：丛枝菌根真菌, 辣椒, 品种, 镉, 固持