Effects of Pathogen Population Levels and Crop-Derived Nutrients on Development of Soybean Sudden Death Syndrome and Growth of Fusarium virguliforme
Autor: | Dean K. Malvick, Crystal M. Floyd, Gretchen M Freed |
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Rok vydání: | 2017 |
Předmět: |
0106 biological sciences
0301 basic medicine education.field_of_study Crop residue biology Inoculation fungi Population food and beverages Plant Science Sorghum biology.organism_classification 01 natural sciences Crop 03 medical and health sciences 030104 developmental biology Agronomy Germination Root rot Radicle education Agronomy and Crop Science 010606 plant biology & botany |
Zdroj: | Plant Disease. 101:434-441 |
ISSN: | 1943-7692 0191-2917 |
Popis: | Sudden death syndrome (SDS) of soybean, caused by Fusarium virguliforme, is a significant disease of soybean. The suite of factors that influence disease development is incompletely understood. The goal of this study was to determine the effects of pathogen population levels, crop residues, seed exudates, and their interactions on development of SDS and growth of F. virguliforme. Studies were conducted in a greenhouse with cultivars susceptible and partially resistant to SDS, four pathogen population levels, and six crop residue treatments (none; ground corn seed, stalks, and roots; ground soybean stems; and sorghum seed). Root rot was assessed 15 and 50 days after inoculation (dai) and foliar disease and plant biomass were assessed 50 dai. Population level increases and crop residues had significant interacting effects on increasing foliar disease severity and root rot and on biomass reduction. Disease severity was positively correlated with population and biomass was negatively correlated. Plants grown with no crop residues exhibited low or no root rot or foliar disease 15 dai, and severity was greatest with corn and sorghum seed. In vitro studies were conducted to test the effects of exudates collected from germinating soybean and corn seed on growth of F. virguliforme and F. solani. Growth of these fungi was greater in exudates than in water. More growth occurred in exudates collected during soybean radicle emergence than those sampled at other times during germination. These studies show that pathogen population levels and crop-derived nutrients in soil interact and influence severity of SDS. Results have implications for gaging disease risk and managing SDS. |
Databáze: | OpenAIRE |
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