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.
Sci Total Environ. 2022 May 1;819:152620. doi: 10.1016/j.scitotenv.2021.152620. Epub 2022 Jan 8.
While interest in arbuscular mycorrhizal (AM) fungal effects on soil phosphorus (P) have recently increased, field experiments on this topic are lacking. While microcosm studies provided valuable insights, the lack of field studies represents a knowledge gap. Here, we present a field study in which we grew a mycorrhiza-defective tomato (Solanum lycopersicum L.) genotype (named rmc) and its mycorrhizal wild-type progenitor (named 76R) with and without additional fertiliser, using a drip-irrigation system to examine the impacts of the AM symbiosis on soil P availability and plant growth and nutrition. AM effects on fruit biomass and nutrients, soil nutrient availability, soil moisture and the soil bacterial community were examined. At the time of harvest, the AM tomato plants without fertiliser had the same early season fruit biomass and fruit nutrient concentrations as plants that received fertiliser. The presence of roots reduced the concentration of available soil P, ammonium and soil moisture in the top 10 cm soil layer. Arbuscular mycorrhizas did not significantly affect soil P availability, soil moisture, or 16S bacterial community composition. These findings suggest an indirect role for AM fungi in tomato production but not necessarily a direct role in determining soil physicochemical traits, during the one season that this experiment was conducted. While longer-term field studies may be required in the future, the present study provides new insights into impacts of AM fungi on P availability and uptake in a field soil system.
虽然人们最近对丛枝菌根（AM）真菌对土壤磷（P）的影响产生了兴趣，但在这一主题上缺乏田间实验。虽然微宇宙研究提供了有价值的见解，但缺乏田间研究代表了一个知识空白。在这里，我们进行了一项田间研究，使用滴灌系统种植了一种丛枝菌根缺陷型番茄（Solanum lycopersicum L.）基因型（命名为 rmc）及其丛枝菌根野生型亲本（命名为 76R），并在有无额外施肥的情况下进行了研究，以检查 AM 共生对土壤 P 有效性和植物生长和营养的影响。研究了 AM 对果实生物量和养分、土壤养分有效性、土壤水分和土壤细菌群落的影响。在收获时，不施肥的 AM 番茄植株与施肥植株的早期果实生物量和果实养分浓度相同。根系的存在降低了 10cm 土壤层中有效土壤 P、铵和土壤水分的浓度。丛枝菌根对土壤 P 有效性、土壤水分或 16S 细菌群落组成没有显著影响。这些发现表明，在本实验进行的一个季节中，丛枝菌根真菌在番茄生产中发挥间接作用，但不一定在决定土壤理化特性方面发挥直接作用。虽然未来可能需要进行更长期的田间研究，但本研究为 AM 真菌在田间土壤系统中对 P 有效性和吸收的影响提供了新的见解。
