Yu Zihao, Zhao Xiaoling, Liang Xinran, Li Zuran, Wang Lei, He Yongmei, Zhan Fangdong
College of Resources and Environment, Yunnan Agricultural University, Kunming 650000, China.
College of Horticulture and Landscape, Yunnan Agricultural University, Kunming 650201, China.
J Fungi (Basel). 2022 Aug 17;8(8):866. doi: 10.3390/jof8080866.
To explore the effect of arbuscular mycorrhizal fungi (AMF) on the environmental migration of cadmium (Cd), a sand column-maize system containing 20 mg·L Cd solution was used to investigate the AMF effect on maize growth, Cd uptake by maize, Cd adsorption by sand and Cd leaching loss. The results showed that AMF significantly increased the content of EE-GRSP and T-GRSP by 34.9% and 37.2%, respectively; the secretion of malonic acid, oxalic acid and succinic acid increased by 154.2%, 54.0% and 11.0%, respectively; the secretion of acetic acid and citric acid increased by 95.5% and 59.9%, respectively; and the length, surface area, volume, tip number and cross number of maize roots decreased by 10%, 15%, 17%, 20% and 36.4%, respectively. AMF significantly increased Cd adsorption by sand by 6.2%, Cd uptake by maize by 68.1%, and Cd leaching loss by 84.6%. In the sand column-maize system, 92.3% of the total Cd was adsorbed by sand, 5.9% was taken up by maize and 1.8% was lost due to leaching. Moreover, Cd adsorption by sand was significantly positively correlated with the GRSP content and oxalic acid secretion, and Cd uptake by roots was significantly negatively correlated with Cd leaching loss. Overall, AMF reduced the loss of Cd in the leaching solution by promoting the release of oxalic acid and GRSP, increasing the adsorption of Cd in the sand and fixing the Cd in the plant to the roots.
为探究丛枝菌根真菌（AMF）对镉（Cd）环境迁移的影响，采用含20 mg·L Cd溶液的砂柱-玉米系统，研究AMF对玉米生长、玉米对Cd的吸收、砂对Cd的吸附以及Cd淋溶损失的影响。结果表明，AMF使易提取球囊霉素（EE-GRSP）和总球囊霉素（T-GRSP）含量分别显著增加34.9%和37.2%；丙二酸、草酸和琥珀酸的分泌量分别增加154.2%、54.0%和11.0%；乙酸和柠檬酸的分泌量分别增加95.5%和59.9%；玉米根的长度、表面积、体积、根尖数和交叉数分别减少10%、15%、17%、20%和36.4%。AMF使砂对Cd的吸附量显著增加6.2%，玉米对Cd的吸收量显著增加68.1%，Cd淋溶损失量显著增加84.6%。在砂柱-玉米系统中，总Cd的92.3%被砂吸附，5.9%被玉米吸收，1.8%因淋溶而损失。此外，砂对Cd的吸附与GRSP含量和草酸分泌显著正相关，根系对Cd的吸收与Cd淋溶损失显著负相关。总体而言，AMF通过促进草酸和GRSP的释放、增加砂对Cd的吸附以及将植物中的Cd固定在根部，减少了淋溶液中Cd的损失。
