Nitrifying Microbes in the Rhizosphere of Perennial Grasses Are Modified by Biological Nitrification Inhibition

文献类型： 外文期刊

第一作者： Zhou, Yi

作者： Zhou, Yi;Li, Jishun;Toh, Ruey;Yang, Hetong;Ryder, Maarten;Denton, Matthew D.;Zhou, Yi;Li, Jishun;Xu, Qili;Toh, Ruey;Yang, Hetong;Ryder, Maarten;Denton, Matthew D.;Lambrides, Christopher J.;Tian, Shenzhong;Yang, Peizhi

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关键词： microbial community; metagenomics; root exudation; turfgrass; forage

期刊名称：MICROORGANISMS （ 影响因子：4.128； ）

ISSN：

年卷期： 2020 年 8 卷 11 期

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收录情况： SCI

摘要： Soil nitrification (microbial oxidation of ammonium to nitrate) can lead to nitrogen leaching and environmental pollution. A number of plant species are able to suppress soil nitrifiers by exuding inhibitors from roots, a process called biological nitrification inhibition (BNI). However, the BNI activity of perennial grasses in the nutrient-poor soils of Australia and the effects of BNI activity on nitrifying microbes in the rhizosphere microbiome have not been well studied. Here we evaluated the BNI capacity of bermudagrass (Cynodon dactylon L.), St. Augustinegrass (Stenotaphrum secundatum (Walt.) Kuntze), saltwater couch (Sporobolus virginicus), seashore paspalum (Paspalum vaginatum Swartz.), and kikuyu grass (Pennisetum clandestinum) compared with the known positive control, koronivia grass (Brachiaria humidicola). The microbial communities were analysed by sequencing 16S rRNA genes. St. Augustinegrass and bermudagrass showed high BNI activity, about 80 to 90% of koronivia grass. All the three grasses with stronger BNI capacities suppressed the populations of Nitrospira in the rhizosphere, a bacteria genus with a nitrite-oxidizing function, but not all of the potential ammonia-oxidizing archaea. The rhizosphere of saltwater couch and seashore paspalum exerted a weak recruitment effect on the soil microbiome. Our results demonstrate that BNI activity of perennial grasses played a vital role in modulating nitrification-associated microbial populations.

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