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Plant phenology influences rhizosphere microbial community and is accelerated by serpentine microorganisms in Plantago erecta
FEMS Microbiology Ecology ( IF 4.2 ) Pub Date : 2021-06-16 , DOI: 10.1093/femsec/fiab085
Alexandria N Igwe 1 , Bibi Quasem 2 , Naomi Liu 2 , Rachel L Vannette 2
Affiliation  

ABSTRACT
Serpentine soils are drought-prone and rich in heavy metals, and plants growing on serpentine soils host distinct microbial communities that may affect plant survival and phenotype. However, whether the rhizosphere communities of plants from different soil chemistries are initially distinct or diverge over time may help us understand drivers of microbial community structure and function in stressful soils. Here, we test the hypothesis that rhizosphere microbial communities will converge over time (plant development), independent of soil chemistry and microbial source. We grew Plantago erecta in serpentine or nonserpentine soil, with serpentine or nonserpentine microbes and tracked plant growth and root phenotypes. We used 16S rRNA gene barcoding to compare bacterial species composition at seedling, vegetative, early- and late-flowering phases. Plant phenotype and rhizosphere bacterial communities were mainly structured by soil type, with minor contributions by plant development, microbe source and their interactions. Serpentine microorganisms promoted early flowering in plants on nonserpentine soils. Despite strong effects of soil chemistry, the convergence in bacterial community composition across development demonstrates the importance of the plant–microbe interactions in shaping microbial assembly processes across soil types.


中文翻译:

植物物候影响根际微生物群落,并被车前子中的蛇形微生物加速

摘要
蛇纹石土壤易干旱且富含重金属,在蛇纹石土壤上生长的植物拥有可能影响植物生存和表型的独特微生物群落。然而,来自不同土壤化学成分的植物的根际群落最初是不同的还是随着时间的推移而发散的,可能有助于我们了解压力土壤中微生物群落结构和功能的驱动因素。在这里,我们测试了根际微生物群落会随着时间的推移(植物发育)收敛的假设,而与土壤化学和微生物来源无关。我们种植车前草在蛇纹石或非蛇纹石土壤中,含有蛇纹石或非蛇纹石微生物并跟踪植物生长和根表型。我们使用 16S rRNA 基因条形码来比较幼苗、营养、早花和晚花阶段的细菌物种组成。植物表型和根际细菌群落主要由土壤类型构成,植物发育、微生物来源及其相互作用的贡献较小。蛇纹石微生物促进了非蛇纹石土壤上植物的早期开花。尽管土壤化学有很强的影响,但细菌群落组成在整个发育过程中的趋同证明了植物-微生物相互作用在塑造不同土壤类型微生物组装过程中的重要性。
更新日期:2021-07-08
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