Diao Fengwei, Jia Bingbing, Luo Junqing, Ding Shengli, Liu Tai, Guo Wei
Shanxi Institute of Organic Dryland Farming, Shanxi Agricultural University, Taiyuan 030031, China; Inner Mongolia Key Laboratory of Environmental Pollution Control and Waste Resource Recycle, Ministry of Education Collaborative Innovation Center for Grassland Ecological Security, Ministry of Education Key Laboratory of Ecology and Resource Use of the Mongolian Plateau, School of Ecology and Environment, Inner Mongolia University, Hohhot 010021, China.
Inner Mongolia Key Laboratory of Environmental Pollution Control and Waste Resource Recycle, Ministry of Education Collaborative Innovation Center for Grassland Ecological Security, Ministry of Education Key Laboratory of Ecology and Resource Use of the Mongolian Plateau, School of Ecology and Environment, Inner Mongolia University, Hohhot 010021, China.
Microbiol Res. 2024 May;282:127657. doi: 10.1016/j.micres.2024.127657. Epub 2024 Feb 23.
Halophytes inhabit saline soils, wherein most plants cannot grow, therefore, their ecological value is outstanding. Arbuscular mycorrhizal (AM) fungi can reconstruct microbial communities to assist plants with stress tolerance. However, little information is available on the microbial community assembly of AM fungi in halophytes. A pot experiment was conducted to investigate the effects of AM fungi on rhizosphere bacterial community structure and soil physiochemical characteristics in the halophyte Suaeda salsa at 0, 100, and 400 mM NaCl. The results demonstrated that AM fungi increased soil alkaline phosphatase (ALP) activity at the three NaCl concentrations, and decreased available P, available K, and the activity of soil catalase (CAT) at 100 mM NaCl. AM fungi decreased the Shannon index of the community at 0 and 100 mM NaCl and increased Sobs index at 400 mM NaCl. Regarding the bacterial community structure, AM fungi substantially decreased the abundance of Acidobacteria phylum at 0 and 100 mM NaCl. AM fungi significantly increased the abundance of genus Ramlibacter, an oxyanion-reducing bacteria that can clean out reactive oxygen species (ROS). AM fungi recruited the genera Massilia and Arthrobacter at 0 and 100 mM NaCl, respectively. Some strains in the two genera have been ascribed to plant growth promoting bacteria (PGPB). AM fungi increased the dry weight and promoted halophyte growth at all three NaCl levels. This study supplements the understanding that AM fungi assemble rhizosphere bacterial communities in halophytes.
盐生植物生长在大多数植物无法生长的盐碱土壤中，因此，它们具有突出的生态价值。丛枝菌根（AM）真菌可以重建微生物群落，帮助植物提高耐胁迫能力。然而，关于盐生植物中AM真菌的微生物群落组装的信息却很少。本研究通过盆栽试验，探究了在0、100和400 mM NaCl条件下，AM真菌对盐生植物盐地碱蓬根际细菌群落结构和土壤理化性质的影响。结果表明，在三种NaCl浓度下，AM真菌均提高了土壤碱性磷酸酶（ALP）活性，在100 mM NaCl条件下降低了有效磷、有效钾和土壤过氧化氢酶（CAT）活性。在0和100 mM NaCl条件下，AM真菌降低了群落的香农指数，在400 mM NaCl条件下提高了观测物种数指数。在细菌群落结构方面，在0和100 mM NaCl条件下，AM真菌显著降低了酸杆菌门的丰度。AM真菌显著增加了Ramlibacter属的丰度，Ramlibacter属是一种能清除活性氧（ROS）的氧阴离子还原细菌。在0和100 mM NaCl条件下，AM真菌分别富集了Massilia属和节杆菌属。这两个属中的一些菌株被认为是植物促生细菌（PGPB）。在所有三个NaCl水平下，AM真菌均增加了盐地碱蓬的干重，促进了盐生植物的生长。本研究补充了对AM真菌在盐生植物中组装根际细菌群落的认识。
