Agrarian Science Center, Department of Soils and Rural Engineering, Federal University of Paraíba, Areia, Paraíba, 58397-000, Brazil.
Centre for Functional Ecology, Department of Life Sciences, University of Coimbra, 3000-456, Coimbra, Portugal.
Microb Ecol. 2018 Jul;76(1):102-112. doi: 10.1007/s00248-017-0999-6. Epub 2017 May 30.
Plant-soil feedback is recognized as the mutual interaction between plants and soil microorganisms, but its role on the biological invasion of the Brazilian tropical seasonal dry forest by invasive plants still remains unclear. Here, we analyzed and compared the arbuscular mycorrhizal fungi (AMF) communities and soil characteristics from the root zone of invasive and native plants, and tested how these AMF communities affect the development of four invasive plant species (Cryptostegia madagascariensis, Parkinsonia aculeata, Prosopis juliflora, and Sesbania virgata). Our field sampling revealed that AMF diversity and frequency of the Order Diversisporales were positively correlated with the root zone of the native plants, whereas AMF dominance and frequency of the Order Glomerales were positively correlated with the root zone of invasive plants. We grew the invasive plants in soil inoculated with AMF species from the root zone of invasive (I ) and native (I ) plant species. We also performed a third treatment with sterilized soil inoculum (control). We examined the effects of these three AMF inoculums on plant dry biomass, root colonization, plant phosphorous concentration, and plant responsiveness to mycorrhizas. We found that I and I promoted the growth of all invasive plants and led to a higher plant dry biomass, mycorrhizal colonization, and P uptake than control, but I showed better results on these variables than I . For plant responsiveness to mycorrhizas and fungal inoculum effect on plant P concentration, we found positive feedback between changed-AMF community (I ) and three of the studied invasive plants: C. madagascariensis, P. aculeata, and S. virgata.
植物-土壤反馈被认为是植物和土壤微生物之间的相互作用，但它在入侵植物对巴西热带季节性干旱森林的生物入侵中的作用仍不清楚。在这里，我们分析和比较了入侵和本地植物根区的丛枝菌根真菌 (AMF) 群落和土壤特性，并测试了这些 AMF 群落如何影响四种入侵植物物种（Cryptostegia madagascariensis、Parkinsonia aculeata、Prosopis juliflora 和 Sesbania virgata）的发育。我们的野外采样表明，AMF 多样性和 Diversisporales 目频率与本地植物的根区呈正相关，而 AMF 优势和 Glomerales 目频率与入侵植物的根区呈正相关。我们在接种了来自入侵（I）和本地（I）植物根区的 AMF 物种的土壤中种植了入侵植物。我们还进行了第三个处理，使用灭菌土壤接种物（对照）。我们研究了这三种 AMF 接种物对植物干生物量、根定植、植物磷浓度和植物对菌根的响应的影响。我们发现 I 和 I 促进了所有入侵植物的生长，并导致植物干生物量、菌根定植和 P 吸收量高于对照，但 I 在这些变量上的表现优于 I 。对于植物对菌根的响应和真菌接种物对植物 P 浓度的影响，我们发现变化的 AMF 群落（I）与三种研究的入侵植物之间存在正反馈：C. madagascariensis、P. aculeata 和 S. virgata。
