College of Resources and Environment, Henan Agricultural University, Zhengzhou, 450046, China.
Key Laboratory of Soil Pollution Control and Remediation in Henan Province, Zhengzhou, 450046, China.
BMC Plant Biol. 2024 May 3;24(1):359. doi: 10.1186/s12870-024-05032-5.
Selenium (Se) fertilizer and arbuscular mycorrhizal fungi (AMF) are known to modulate cadmium (Cd) toxicity in plants. However, the effects of their co-application on wheat growth and soil microbial communities in Cd-contaminated soil are unclear.
A pot experiment inoculation with two types of AMF and the application of Se fertilizer under Cd stress in wheat showed that inoculation AMF alone or combined with Se fertilizer significantly increased wheat biomass. Se and AMF alone or in combination significantly reduced available Cd concentration in wheat and soil, especially in the Se combined with Ri treatment. High throughput sequencing of soil samples indicated that Se and AMF application had stronger influence on bacterial community compared to fungal community and the bacterial network seemed to have more complex interconnections than the fungal network, and finally shaped the formation of specific microflora to affect Cd availability.
These results indicate that the application of Se and AMF, particularly in combination, could successfully decrease soil Cd availability and relieve the harm of Cd in wheat by modifying rhizosphere soil microbial communities.
硒（Se）肥料和丛枝菌根真菌（AMF）已知可调节植物中的镉（Cd）毒性。然而，它们在污染土壤中对小麦生长和土壤微生物群落的共同应用的影响尚不清楚。
在 Cd 胁迫下接种两种 AMF 和施用 Se 肥料的盆栽实验表明，单独接种 AMF 或与 Se 肥料结合使用均可显著增加小麦生物量。Se 和 AMF 单独或联合使用可显著降低小麦和土壤中有效 Cd 浓度，尤其是在 Se 与 Ri 联合处理时。土壤样本高通量测序表明，与真菌群落相比，Se 和 AMF 的应用对细菌群落的影响更大，细菌网络似乎比真菌网络具有更复杂的相互联系，并最终形成特定的微生物群落来影响 Cd 的有效性。
这些结果表明，通过改变根际土壤微生物群落，施用 Se 和 AMF，特别是两者联合施用，可以成功降低土壤 Cd 的有效性，并减轻 Cd 对小麦的危害。
