The Waite Research Institute and The School of Agriculture, Food and Wine, The University of Adelaide, Waite Campus, PMB1, Glen Osmond, SA 5064, Australia.
The Waite Research Institute and The School of Agriculture, Food and Wine, The University of Adelaide, Waite Campus, PMB1, Glen Osmond, SA 5064, Australia; Australian Research Council Centre of Excellence in Plant Energy Biology, University of Adelaide, Glen Osmond, South Australia, Australia.
Sci Total Environ. 2020 Jun 20;722:137847. doi: 10.1016/j.scitotenv.2020.137847. Epub 2020 Mar 10.
While the impact of arbuscular mycorrhizal fungi (AMF) on phosphorus (P) uptake is well understood, the mechanism(s) of how these fungi affect P leaching from soil is still unclear. Here we present results of a study in which we grew a mycorrhiza-defective tomato (Solanum lycopersicum L.) genotype (named rmc) and its mycorrhizal wild-type progenitor (named 76R) in microcosms containing non-sterile soil, to examine the influence of roots and AMF on P leaching. More P was leached from the planted microcosms as compared to the plant-free controls. Further, although there was more plant biomass and greater P uptake in the mycorrhizal plant treatments, these treatments were associated with the most leaching of total P, reactive P, and dissolved organic carbon (DOC). There was a strong correlation between the total P and DOC leached, suggesting that root and fungal exudates may have affected P leaching. These findings provide new insights into the impact of roots and AMF on nutrient leaching in soils.
虽然丛枝菌根真菌 (AMF) 对磷 (P) 吸收的影响已得到充分理解，但这些真菌影响土壤中 P 淋失的机制仍不清楚。在这里，我们介绍了一项研究的结果，我们在含有非无菌土壤的微宇宙中种植了一种丛枝菌根缺陷型番茄 (Solanum lycopersicum L.) 基因型 (命名为 rmc) 和其丛枝菌根野生型亲本 (命名为 76R)，以研究根系和 AMF 对 P 淋失的影响。与无植物对照相比，种植微宇宙中淋出的 P 更多。此外，尽管在丛枝菌根植物处理中有更多的植物生物量和更大的 P 吸收，但这些处理与总 P、反应性 P 和溶解有机碳 (DOC) 的最大淋失有关。淋出的总 P 和 DOC 之间存在很强的相关性，这表明根和真菌分泌物可能影响了 P 的淋失。这些发现为根系和 AMF 对土壤养分淋失的影响提供了新的见解。
