Biocontrol Systems for Rhizotocnia Disease of Soybean
Thimmaiah, Narendrappa
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https://hdl.handle.net/2142/85050
Description
Title
Biocontrol Systems for Rhizotocnia Disease of Soybean
Author(s)
Thimmaiah, Narendrappa
Issue Date
1997
Doctoral Committee Chair(s)
Sinclair, James B.
Department of Study
Crop Sciences
Discipline
Crop Sciences
Degree Granting Institution
University of Illinois at Urbana-Champaign
Degree Name
Ph.D.
Degree Level
Dissertation
Keyword(s)
Agriculture, Agronomy
Language
eng
Abstract
The detection of proteolytic activity by strain B153-2-2 and isolate 2B-12 indicated the possible involvement of extracellular enzymes in antagonism and biocontrol. Antagonism by cell-free culture filtrate fractions indicated that strain B153-2-2 produced an active metabolite. Endopeptidase, acid protease, and an extracellular proteinase (metalloproteinase) were detected in the interaction and were identified based on molecular cut-off, pH range, and inactivation by inhibitors. Extracellular enzymes altered the branching pattern of R. solani isolate 2B-12 and were effective in retarding the growth of the fungal pathogen.
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