丛枝菌根真菌对镉胁迫下芦竹生长、光合特性和矿质营养的影响

为揭示丛枝菌根真菌（Arbuscular mycorrhizal fungi，AMF）对芦竹耐镉（Cd）胁迫的作用及其机理，采用大棚盆栽试验，利用丛枝菌根真菌（AMF）摩西管柄囊霉（Funneliformis mosseae，FM）、根内根孢囊霉（Rhizophagus intraradices，RI）、地表球囊霉（Glomus versiforme，GV）进行接种试验，研究了在Cd胁迫下接种AMF对芦竹生长、光合、矿质营养的影响。结果表明：AMF能够显著改善Cd胁迫下芦竹的生长状况，与对照相比，接种处理芦竹的株高增加19.09%~27.98%，叶长增加12.18%~31.06%，叶绿素相对含量SPAD值增加8.55%~9.36%，地上和根系生物量分别增加20.08%~31.41%、12.24%~24.12%，最大净光合速率增加7.08%~32.12%，芦竹根系全P含量增加30.26%~46.05%。接种处理后芦竹地上Cd含量介于68~105.97 mg/kg之间，显著高于对照处理（42.20 mg/kg），根系Cd含量介于113.07~221.47 mg/kg之间，显著高于对照处理（46.47 mg/kg），且根系Cd含量显著高于地上部。Cd胁迫下不同AMF菌种对芦竹产生的效应有差异，其中，RI处理对芦竹株高、叶长促进效应最好，经GV处理的芦竹全N、全P、全K含量以及Cd含量最高。Cd胁迫下接种AMF能促进芦竹的生长，增强其光合作用，提高全N、全P、全K吸收量，同时增强了芦竹对Cd的吸收。该研究表明芦竹丛枝菌根共生体对重金属Cd具有较强的固持作用，在Cd污染土壤修复中具有潜在应用价值。

Effects of Arbuscular Mycorrhizal Fungi on Growth, Photosynthesis Characteristics and Mineral Nutrition of Arundo donax Under Cd Stress

In order to reveal the effect and mechanism of arbuscular mycorrhizal fungi (AMF) on cadmium(Cd) stress tolerant of Arundo donax, greenhouse pot experiment was conducted using arbuscular mycorrhizal fungi (AMF)Funneliformis mosseae (FM), Rhizophagus intraradices (RI), and Glomus versiforme (GV). Inoculation experiments were conducted to investigate the effects of inoculation of AMF on the growth, photosynthesis and mineral nutrition of Arundo donax under cadmium stress. The results showed that under stress, cadmium inoculation significantly improve the of AMF could growth of plant. Compared with the control, the plant height of plantincreased by 19.09%~27.98%, the leaf length increased by 12.18%~31.06%, and the chlorophyll content SPAD value increased by 8.55%~9.36%, the biomass of aboveground and belowground increased by 20.08%~31.41%, 12.24%~24.12%, the maximum net photosynthetic rate increased by 7.08%~32.12%, and the P content of root increased by 30.26%~46.05%. After inoculation treatment, the Cd content of Arundo donax was between 68~105.97 mg/kg, which was significantly higher than that of the control treatment (42.20 mg/kg). The Cd content of root cadmium ranged from 113.07 to 221.71 mg/kg. Significantly higher than the control treatment (46.47 mg/kg), The effects of different AMF strains on the growth of asparagus were different. The effects of different AMF strains on plant under cadmium stress were different. For example, RI treatment had the best effect on plant height and leaf length. The total N, total P, total K content and Cd content were the highest by GV treatment. This study show that inoculation of AMF under cadmium stress can promote the growth of plant , enhance its photosynthesis, increase the absorption of N and P and K, and enhance the absorption of cadmium by plant. The Arundo donaxarbuscular mycorrhizal symbiont has a potential application value in the restoration of cadmium contaminated soil.