Affiliation:
1. Department of Biological Sciences, Rutgers University, Newark, New Jersey 07102-1811
2. Department of Chemical Engineering, New Jersey Institute of Technology, Newark, New Jersey 07102
Abstract
ABSTRACT
The interactions among
Spartina patens
and sediment microbial populations and the interactions among
Phragmites australis
and sediment microbial populations were studied at monotypic sites in Piermont Marsh, a salt marsh of the Hudson River north of New York, N.Y., at key times during the growing season. Arbuscular mycorrhizal fungi (AMF) effectively colonized
S. patens
but not
P. australis
, and there were seasonal increases and decreases that coincided with plant growth and senescence (17 and 6% of the
S. patens
root length were colonized, respectively). In sediment samples from the
Spartina
site, the microbial community and specific bacterial populations were at least twice as large in terms of number and biomass as the microbial community and specific bacterial populations in sediment samples from the
Phragmites
site, and peak values occurred during reproduction. Members of the domain
Bacteria
, especially members of the α-, γ-, and δ-subdivisions of the
Proteobacteria
, were the most abundant organisms at both sites throughout the growing season. The populations were generally more dynamic in samples from the
Spartina
site than in samples from the
Phragmites
site. No differences between the two sites and no differences during the growing season were observed when restriction fragment length polymorphism analyses of
nifH
amplicons were performed in an attempt to detect shifts in the diversity of nitrogen-fixing bacteria. Differences were observed only in the patterns generated by PCR or reverse transcription-PCR for samples from the
Spartina
site, suggesting that there were differences in the overall and active populations of nitrogen-fixing bacteria. Regression analyses indicated that there was a positive interaction between members of the δ-subdivision of the
Proteobacteria
and root biomass but not between members of the δ-subdivision of the
Proteobacteria
and macroorganic matter at both sites. In samples from the
Spartina
site, there were indications that there were bacterium-fungus interactions since populations of members of the α-subdivision of the
Proteobacteria
were negatively associated with AMF colonization and populations of members of the γ-subdivision of the
Proteobacteria
were positively associated with AMF colonization.
Publisher
American Society for Microbiology
Subject
Ecology,Applied Microbiology and Biotechnology,Food Science,Biotechnology
Cited by
95 articles.
订阅此论文施引文献
订阅此论文施引文献,注册后可以免费订阅5篇论文的施引文献,订阅后可以查看论文全部施引文献