Plant Ecophysiology Group, Department of Plant Biology and Soil Science, University of Vigo, Vigo, Spain.
CITACA, Agri-Food Research and Transfer Cluster, Campus da Auga, University of Vigo, Ourense, Spain.
Plant Biol (Stuttg). 2022 Apr;24(3):417-429. doi: 10.1111/plb.13402. Epub 2022 Feb 26.
The presence of invasive alien plants (IAPs) alters the composition of soil arbuscular mycorrhizal (AM) fungal communities. Although fundamental for plant development, plant responses to AM from invaded soils have not been widely explored, especially under environmental stress. We compared plant growth, P accumulation, root colonization and the photosynthetic responses of the native AM-dependent Plantago lanceolata growing in contact with AM fungi from communities invaded by Acacia dealbata Link (AMinv) or non-invaded communities (AMnat) exposed to water and light restriction (shade). Under optimal growing conditions, plants in contact with AMnat produced higher leaf biomass and accumulated more P. However, plant responses to different AM inocula varied as the level of stress increased. Inoculation with AMinv promoted plant growth and root length under light restriction. When plants grew in contact with AMnat under drought, leaf P increased under severe water restriction, and leaf and root P increased under intermediate water irrigation. Growing in contact with the AMnat inoculum promoted root P content in both full light and light restriction. Colonization rates of P. lanceolata roots were comparable between treatments, and plants maintained photosynthetic activity within similar ranges, regardless of the level of stress applied. Our results suggest that origin of the inoculum (native soils versus invaded soils) did not affect the ability of AM species therein to establish effective mutualistic associations with P. lanceolata roots but did influence plant responses depending on the type and level of the abiotic stress.
入侵外来植物（IAP）的存在改变了土壤丛枝菌根（AM）真菌群落的组成。尽管丛枝菌根对植物的发育至关重要，但植物对入侵土壤中丛枝菌根的反应尚未得到广泛探索，特别是在环境压力下。我们比较了在接触到被银荆（Acacia dealbata Link）入侵或未被入侵的社区（AMnat）的丛枝菌根真菌的情况下，生长在接触土壤中的本地 AM 依赖型 Plantago lanceolata 的植物生长、磷积累、根系定殖和光合响应，这些社区受到水和光限制（遮荫）的影响。在最佳生长条件下，与 AMnat 接触的植物产生更高的叶片生物量并积累更多的磷。然而，随着胁迫水平的增加，植物对不同 AM 接种体的反应也不同。在光照限制下，接种 AMinv 可促进植物生长和根长。当植物在干旱条件下与 AMnat 接触时，在严重缺水条件下叶片磷增加，在中度灌溉条件下叶片和根磷增加。在与 AMnat 接种体接触的情况下，在全光照和光照限制下均促进了根磷含量的增加。P. lanceolata 根系的定殖率在处理之间相当，并且无论施加的胁迫水平如何，植物都能保持相似范围内的光合作用活性。我们的结果表明，接种体的起源（本地土壤与入侵土壤）不会影响其中的 AM 物种与 P. lanceolata 根系建立有效共生关系的能力，但会根据生物胁迫的类型和水平影响植物的反应。
