Strong associations between plant genotypes and bacterial communities in a natural salt marsh

Ecology and Evolution
Gregory P ZoggDaniel A Brazeau

Abstract

Although microbial communities have been shown to vary among plant genotypes in a number of experiments in terrestrial ecosystems, relatively little is known about this relationship under natural conditions and outside of select model systems. We reasoned that a salt marsh ecosystem, which is characterized by twice-daily flooding by tides, would serve as a particularly conservative test of the strength of plant-microbial associations, given the high degree of abiotic regulation of microbial community assembly resulting from alternating periods of inundation and exposure. Within a salt marsh in the northeastern United States, we characterized genotypes of the foundational plant Spartina alterniflora using microsatellite markers, and bacterial metagenomes within marsh soil based on pyrosequencing. We found significant differences in bacterial community composition and diversity between bulk and rhizosphere soil, and that the structure of rhizosphere communities varied depending on the growth form of, and genetic variation within, the foundational plant S. alterniflora. Our results indicate that there are strong plant-microbial associations within a natural salt marsh, thereby contributing to a growing body of evidence for a relat...Continue Reading

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Methods Mentioned

BETA
genotyping
electrophoresis
PCR

Software Mentioned

PERMANOVA
STAMP
MG
SYSTAT
PolyRelatedness
Genemapper
PASSaGE
RAST
PAST
Phyla

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