Center for Rhizosphere Biology Department of Horticulture and Landscape Architecture, Colorado State University, Fort Collins, CO, 80523-1101, USA.
United States Department of Agriculture - Agricultural Research Services, Soil Management and Sugar Beet Research, Fort Collins, CO, 80526, USA.
Microb Ecol. 2020 Jul;80(1):169-180. doi: 10.1007/s00248-020-01486-w. Epub 2020 Feb 3.
There is evidence that shows that phosphorus (P) fertilization has a moderate effect on the rhizosphere microbial composition of cultivated crops. But how this effect is manifested on wild species of the same crop is not clear. This study compares the impact of phosphorus fertilization with rhizosphere bacterial community composition and its predicted functions, related to P-cycling genes, in both cultivated and non-cultivated potato (Solanum sp.) plants. It was found that the biomass of non-cultivated potatoes was more responsive to P fertilization as compared with cultivated plants. Differences in general bacterial community composition patterns under increasing P amendments were subtle for both potato groups. However, potato genotype significantly influenced community composition with several bacterial families being more abundant in the cultivated plants. In addition, the predicted phosphatases had lower abundances in modern cultivars compared with non-cultivated potatoes. In summary, despite higher accumulation of differentially abundant bacteria in the rhizosphere of cultivated plants, the responsiveness of these plants to increase P levels was lower than in non-cultivated plants.
有证据表明，磷（P）施肥对栽培作物根际微生物组成有中等影响。但是，这种影响在同一作物的野生种上是如何表现的尚不清楚。本研究比较了磷施肥对根际细菌群落组成及其与 P 循环基因相关的预测功能的影响，在栽培和非栽培马铃薯（Solanum sp.）植物中都有涉及。结果发现，与栽培植物相比，非栽培马铃薯的生物量对 P 施肥的响应更为敏感。对于这两组马铃薯来说，随着 P 施肥量的增加，一般细菌群落组成模式的差异很细微。然而，马铃薯基因型显著影响了群落组成，一些细菌家族在栽培植物中更为丰富。此外，与非栽培马铃薯相比，现代栽培品种中预测的磷酸酶丰度较低。总的来说，尽管在栽培植物的根际中积累了更多的差异丰度细菌，但这些植物对增加 P 水平的反应性低于非栽培植物。
