Investigation of Rhizospheric Microbial Communities in Wheat, Barley, and Two Rice Varieties at the Seedling Stage

The plant rhizosphere microbiota
plays multiple roles in plant
growth. We investigated the taxonomic and functional variations in
the rhizosphere microbial community, examining both prokaryotes and
eukaryotes, of four crops at the seedling stage: wheat, barley, and
two rice varieties (indica and japonica) seeded in paddy soil. The diversity of
rhizosphere communities in these four species was determined. Results
showed that wheat and barley had much stronger selection effects than
rice for the rhizosphere microbial community. Functional metagenomic
profiling indicated that a series of sequences related to glycan,
limonene, and pinene degradation pathways as well as some relatively
rare functions related to N or S metabolism were enriched in the rhizosphere
soil. We conclude that the four tested crops induced the formation
of the microbial community with specific features that may influence
the plant growth but stochastic processes also appreciably influenced
the functional selection.

植物根际微生物群落扮演着在植物生长过程中的多重角色。本研究对四种作物——小麦、大麦以及两种水稻品种（分别为籼稻和粳稻）在秧苗阶段的根际微生物群落的分类和功能差异进行了探究，考察了其中原核生物和真核生物的组成。对这四种作物根际微生物群落的多样性进行了测定。研究结果显示，小麦和大麦对根际微生物群落的选择效应显著强于水稻。功能宏基因组分析表明，与糖类、柠檬烯和松针烯降解途径相关的多个序列，以及一些与氮或硫代谢相关的相对罕见的功能在根际土壤中富集。据此，我们得出结论：所测试的四种作物诱导形成了具有特定特征的微生物群落，这些特征可能影响植物生长，但随机过程亦对功能选择产生了显著影响。