Key Laboratory of State Forestry and Grassland Administration on Forest Ecosystem Protection and Restoration of Poyang Lake Watershed, Jiangxi Agricultural University, Nanchang 330045, China.
Gannan Arboretum, Ganzhou 341000, China.
Can J Microbiol. 2021 May;67(5):349-357. doi: 10.1139/cjm-2020-0227. Epub 2021 Mar 26.
Arbuscular mycorrhizal (AM) fungi play an important role in the acquisition of phosphorus (P) by plants. The external hyphae of AM fungi function as an extension of plant roots and may downregulate related functions in the roots. It is not clear whether the ability of AM fungi to mineralize organic P affects root phosphatase activities. A pot experiment was conducted to investigate the effect of on soil organic P mineralization under phytate application and to explore root phosphatase activities, P uptake, and growth in Abel. The plants and their growth substrates were harvested 4 and 8 months after planting. The results showed that organic P application had no effect on the total dry mass of nonmycorrhizal plants, but differences in dry mass under P application were observed in mycorrhizal plants in both harvests. Inoculation with . increased soil acid phosphatase, phytase, and alkaline phosphatase activities and reduced the soil organic P content. Mycorrhizal plants had higher root activity, shoot and root P contents and root acid phosphatase and phytase activities than nonmycorrhizal plants irrespective of organic P application. In conclusion, AM fungi enhanced the mineralization of soil organic P and positively affect root phosphatase activities.
丛枝菌根（AM）真菌在植物磷（P）获取中发挥重要作用。AM 真菌的外生菌丝作为植物根系的延伸，可能会下调根系中的相关功能。目前尚不清楚 AM 真菌矿化有机 P 的能力是否会影响根磷酸酶活性。本研究采用盆栽试验，研究在植酸施入条件下 AM 真菌对土壤有机 P 矿化的影响，并探讨根磷酸酶活性、P 吸收和生长在百脉根中的表现。在种植后 4 个月和 8 个月收获植物及其生长基质。结果表明，有机 P 应用对非菌根植物的总干质量没有影响，但在两个收获期的菌根植物中，P 处理下的干质量存在差异。接种. 增加了土壤酸性磷酸酶、植酸酶和碱性磷酸酶活性，降低了土壤有机 P 含量。无论是否施加有机 P，与非菌根植物相比，菌根植物具有更高的根活力、地上部和根部 P 含量以及根酸性磷酸酶和植酸酶活性。总之，AM 真菌增强了土壤有机 P 的矿化作用，并正向影响根磷酸酶活性。
