Plant Species and Soil Type Effects on Root Characteristics, Microbiota and Plant-soil Feedback Responses in Four Prairie Species

<p>Arbuscular mycorrhizal fungi (AMF) form a relationship with a multitude of host plants that is estimated to include 70-90% of terrestrial plant species over a wide range of environments. AMF and other microbiota, as well as abiotic factors are an important component of plant-soil feedback systems. The effects of plant species and soil type on root characteristics, plant-soil feedback and influence on microbiota and arbuscular mycorrhizal colonization were assessed through a manipulative laboratory study. Aster laevis, Parthenium integrifolium, Aster novae-angliae and Andropogon gerardii were grown in sterilized control soil and soil collected from beneath monocultures of A. laevis, P. integrifolium, and A. gerardii. Soil type (heterospecific and conspecific sources) was expected to have the largest influence on root characteristics and AMF colonization. Microbial community carbon metabolism became more homogenous after the study was completed. It was found that both plant and soil had similar influence. Negative feedback was expected for plants grown in A. gerardii soil, but the opposite was observed. The relationships between AMF colonization and fine root branching, and between AMF and specific root length were hypothesized to be negative. Specific root length was found to be negatively correlated to proportion mycorrhizal colonization, but fine root size and branching characteristics were not correlated with AMF colonization. Total biomass was positively correlated with proportion mycorrhizal colonization. It was found that mycorrhizal dependence of the four prairie species studied was high and plant death only occurred in 26 sterilized control soils. No net feedback was observed for A. laevis, P. Integrifolium, and A. gerardii.</p>

Name thesis:degree_name

Master of Science

Level thesis:degree_level

Thesis

Discipline thesis:degree_discipline

Environmental Biology

Year dc:date.available

2014

Author dc:creator

• Impastato, Charles J.

Contributors dc:contributor

• Mary E. Carrington, Ph.D.
• Timothy Gsell, Ph.D.
• John Yunger, Ph. D.

• Arbuscular mycorrhizal fungi (AMF)
• plant-soil feedback
• arbuscular mycorrhizal fungi
• Andropogon gerardii
• Aster laevis
• Aster novae-angliae
• Parthenium integrifolium
• microbiota microbiota
• Environmental Sciences

Repository record dc:identifier

https://opus.govst.edu/theses/51

OAI identifier oai:identifier

oai:opus.govst.edu:theses-1053