Prado-Tarango David Eduardo, Mata-Gonzalez Ricardo, Hovland Matthew
Department of Animal and Rangeland Sciences, Oregon State University, Corvallis, OR 97331, USA.
Microorganisms. 2022 Dec 23;11(1):50. doi: 10.3390/microorganisms11010050.
The genus includes several keystone shrub species that dominate the North American sagebrush steppe. Their growth, survival, and establishment are negatively affected by exotic invasive grasses such as . While the outcomes of symbiotic relationships between spp. and arbuscular mycorrhizal fungi (AMF) are ambiguous, the benefits of ameliorated nutrient and drought stress may be cryptic and better revealed under competition. We evaluated the effects of a commercial AMF inoculum on ameliorating biotic (competition with ) and abiotic (drought) stress of ssp. , and when grown in sterile and microbially active field soil. Stress amelioration was measured as an increase in biomass production and nutrient acquisition. Mycorrhizal colonization of roots was lower in plants grown in competition, while colonization was higher in plants with greater moisture. Both types of stress negatively affected plant biomass. Commercial AMF inoculation did not increase biomass. Colonization from field soil increased average phosphorous concentration under drought for ssp. by 36% and by 125%. While commercial inoculum and live soil led to AMF colonization of , only the commercial inoculum increased average phosphorus uptake by 71%.
该属包括几种在北美蒿属草原占主导地位的关键灌木物种。它们的生长、存活和定植受到诸如……等外来入侵草类的负面影响。虽然……物种与丛枝菌根真菌（AMF）之间共生关系的结果尚不明确，但改善养分和干旱胁迫的益处可能很隐蔽，在竞争条件下可能会更明显地显现出来。我们评估了一种商业AMF接种剂对改善……亚种在无菌和有微生物活性的田间土壤中生长时的生物胁迫（与……竞争）和非生物胁迫（干旱）的影响。胁迫改善通过生物量生产和养分获取的增加来衡量。在竞争环境中生长的……植物根系的菌根定殖率较低，而在水分含量较高的植物中……定殖率较高。这两种胁迫都对植物生物量产生负面影响。商业AMF接种并未增加生物量。田间土壤中的定殖使……亚种在干旱条件下的平均磷浓度提高了36%，……提高了125%。虽然商业接种剂和活性土壤导致了……的AMF定殖，但只有商业接种剂使平均磷吸收增加了71%。
