Factors Influencing the Distribution, Growth and Infectivity of Casuarina-Infective Frankia
Zimpfer, Jeff Frederick
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https://hdl.handle.net/2142/83079
Description
Title
Factors Influencing the Distribution, Growth and Infectivity of Casuarina-Infective Frankia
Author(s)
Zimpfer, Jeff Frederick
Issue Date
2001
Doctoral Committee Chair(s)
Dawson, Jeffrey O.
Department of Study
Natural Resrouces and Environmental Sciences
Discipline
Natural Resrouces and Environmental Sciences
Degree Granting Institution
University of Illinois at Urbana-Champaign
Degree Name
Ph.D.
Degree Level
Dissertation
Keyword(s)
Agriculture, Soil Science
Language
eng
Abstract
Further studies revealed that Casuarina cladodes increased the infectivity of a soil inoculum by a factor of 3.2, whereas leaves of a sympatric check plant, Terminalia catappa (Combretaceae), barely increased the same soil's infectivity. Charcoal and clay added to the seedling growth substrate to bind organic material significantly inhibited nodulation of C. cunninghamiana by a Frankia isolate, suggesting the host may release compounds necessary to the nodulation process. In a final study, the infectivity of soils inoculated with Frankia isolate CjI82001 decreased over time, whereas infectivity of soils without inoculum either increased or remained unaffected. A positive synergism was observed between the Frankia isolate and the soil biotic community, resulting in an increased infectivity of the Frankia isolate.
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