Zhang Mengge, Shi Zhaoyong, Lu Shichuan, Wang Fayuan
College of Agriculture, Henan University of Science and Technology, Luoyang 471023, China.
Luoyang Key Laboratory of Symbiotic Microorganism and Green Development, Luoyang 471023, China.
J Fungi (Basel). 2023 Apr 16;9(4):479. doi: 10.3390/jof9040479.
The use of arbuscular mycorrhizal fungi (AMF) is a vital strategy for enhancing the phytoremediation of heavy metals. However, the role of AMF under molybdenum (Mo) stress is elusive. A pot culture experiment was conducted to explore the effects of AMF ( and ) inoculation on the uptake and transport of Mo and the physiological growth of maize plants under different levels of Mo addition (0, 100, 1000, and 2000 mg/kg). AMF inoculation significantly increased the biomass of maize plants, and the mycorrhizal dependency reached 222% at the Mo addition level of 1000 mg/kg. Additionally, AMF inoculation could induce different growth allocation strategies in response to Mo stress. Inoculation significantly reduced Mo transport, and the active accumulation of Mo in the roots reached 80% after inoculation at the high Mo concentration of 2000 mg/kg. In addition to enhancing the net photosynthetic and pigment content, inoculation also increased the biomass by enhancing the uptake of nutrients, including P, K, Zn, and Cu, to resist Mo stress. In conclusion, and were tolerant to the Mo stress and could alleviate the Mo-induced phytotoxicity by regulating the allocation of Mo in plants and improving photosynthetic leaf pigment contents and the uptake of nutrition. Compared with , showed a stronger tolerance to Mo, which was manifested by a stronger inhibition of Mo transport and a higher uptake of nutrient elements. Accordingly, AMF show potential for the bioremediation of Mo-polluted soil.
丛枝菌根真菌（AMF）的应用是增强重金属植物修复的关键策略。然而，AMF在钼（Mo）胁迫下的作用尚不清楚。进行了盆栽试验，以探究AMF接种对不同添加水平（0、100、1000和2000 mg/kg）钼的吸收和转运以及玉米植株生理生长的影响。接种AMF显著增加了玉米植株的生物量，在添加钼水平为1000 mg/kg时菌根依赖性达到222%。此外，接种AMF可诱导不同的生长分配策略以应对钼胁迫。接种显著减少了钼的转运，在高钼浓度2000 mg/kg接种后，根部钼的主动积累达到80%。接种除了提高净光合和色素含量外，还通过增强对包括磷、钾、锌和铜在内的养分的吸收来增加生物量，以抵抗钼胁迫。总之，[此处原文中提到的两种菌根真菌名称缺失，假设为A和B]A和B对钼胁迫具有耐受性，可通过调节植物体内钼的分配、提高光合叶片色素含量和养分吸收来减轻钼诱导的植物毒性。与A相比，B对钼表现出更强的耐受性，表现为对钼转运的更强抑制和对营养元素的更高吸收。因此，AMF在钼污染土壤的生物修复方面具有潜力。
