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dc.contributor.authorGraves, Donald Wayne
dc.date.accessioned2015-10-02T00:40:18Z
dc.date.available2015-10-02T00:40:18Z
dc.date.issued2001
dc.identifier.urihttp://hdl.handle.net/10179/7152
dc.description.abstractIn soil and root ecosystems the partitioning of carbon is ubiquitously affected by interactions with heterotrophic rhizosphere micro organisms, including the potentially mutually beneficial (+,+) arbuscular mycorrhizal (AM) fungi. However, the existence and sustainable management of AM fungi is threatened by prolonged and or intensive disturbances of soil. Therefore this study set out to explore the relationships between plants, soil fungi and soil disturbance treatments. A containerised bioassay of maize seedlings was used to assess root inhabitation of arbuscular mycorrhizal fungi from samples of Manawatu silt loam pasture field soils, methods were adapted from Brundrett et al (1996). Development of a rapid method to visualise the AM fungal inhabited maize seedling roots was enhanced by an alternative light source on an Olympus SZIII dissection microscope. A 100W-equivalent fluorescent light tube produced less heat, but provided approximately five-fold more illumination than the original 20W Olympus incandescent light bulb. It was found that propagation of maize seedlings during mid to late winter and greenhouse environments with relatively limited light day-length and irradiance levels may have resulted in 'parasitic' (+,-) soil-fungal interactions, or reduced growth of maize seedling plant biomass. Soil fungal parasitism of plant growth was attributed to mutual competition (-,-) for carbon photosynthate resources shared between soil fungi and plant host symbionts. In addition, a Venn-diagram model is proposed with three entities depicting fungal and plant population interactions that include mutual costs and benefits derived from bidirectional exchange of mineral and carbon nutrients as follows; mutualism and protocooperation (+,+); neutralism (0,0); and competition (-,-). Intersecting sets of these entities depict a three-way continuum of population interactions; parasitism or predation (+,-), and prey or host escape (-,+); amensalism (0,- or -,0); and commensalism (0,+ or +,0).en_US
dc.language.isoenen_US
dc.publisherMassey Universityen_US
dc.rightsThe Authoren_US
dc.subjectMycorrhizas in agricultureen_US
dc.subjectVesicular-arbuscular mycorrhizasen_US
dc.subjectTillageen_US
dc.subjectSoilsen_US
dc.subjectArbuscular mycorrhizal fungien_US
dc.subjectSoil disturbanceen_US
dc.titleAn analysis of the effects of field-soil disturbance treatments on arbuscular mycorrhizal fungi : a thesis presented in partial fulfilment of the requirements for the degree of Master of Sciences in Plant Biology, Massey Universityen_US
dc.typeThesisen_US
thesis.degree.disciplinePlant Biologyen_US
thesis.degree.grantorMassey Universityen_US
thesis.degree.levelMastersen_US
thesis.degree.nameMaster of Science (M.Sc.)en_US


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