Nutrient conditions mediate mycorrhizal effects on biomass production and cell wall chemistry in poplar

 Large-scale biofuel production from lignocellulosic feedstock is limited by the financial and environmental costs associated with growing and processing lignocellulosic material and the resilience of these plants to environmental stress. Symbiotic associations with arbuscular (AM) and ectomycorrhizal (EM) fungi represent a potential strategy for expanding feedstock production while reducing nutrient inputs. Comparing AM and EM effects on wood production and chemical composition is a necessary step in developing biofuel feedstocks. Here, we assessed the productivity, biomass allocation and secondary cell wall (SCW) composition of greenhouse-grown Populus tremuloidesMichx. inoculated with either AM or EM fungi. Given the long-term goal of reducing nutrient inputs for biofuel production, we further tested the effects of nutrient availability and nitrogen: phosphorus stoichiometry on mycorrhizal responses. Associations with both AM and EM fungi increased plant biomass by 14–74% depending o...以木质纤维素原料为基础的大规模生物燃料生产，受到种植、加工木质纤维素材料的经济与环境成本，以及这类植物应对环境胁迫的抗逆性制约。与丛枝菌根（arbuscular mycorrhizal, AM）及外生菌根（ectomycorrhizal, EM）真菌形成共生关联，是扩大原料生产规模并减少养分投入的潜在策略。对比AM与EM真菌对木材产量及化学组成的影响，是开发生物燃料原料的必要环节。本研究针对温室栽培的美洲山杨（Populus tremuloides Michx.），对接种AM或EM真菌后的植株生产力、生物量分配及次生细胞壁（secondary cell wall, SCW）组成进行了评估。鉴于降低生物燃料生产养分投入的长期目标，我们进一步探究了养分有效性及氮磷化学计量比对菌根响应的影响。与AM、EM真菌形成的共生关系均可使植株生物量提升14%~74%，具体增幅取决于...