Sporangium of Pythium Ultimum Trow as a Survival Structure in Soil |
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Contents
MATERIALS AND METHODS | 8 |
Infection studies | 12 |
Measurement of the radial extent of the spermosphere | 15 |
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100 cm suction 24 hr incubation Aliquots bean seed chlamydospore damping-off debaryanum evacuated germ tube field capacity field soil fungal Fusarium solani germ tube growth germination in soil germination occurred germlings glucose growth rate host exudations hr after amending hr after sowing hr at 24 hyphal hyphal strands hyphal tips incubation at 24 inoculum intercalary sporangia lysis mycelial naturally infested soil nutrient nutrient levels observed oospores parent sporangium pathogen percentage germination Permanent wilting point petri plates phaseoli propagule protoplasmic Pseudomonas Pythium spp Pythium ultimum Trow radicle rolled oat secondary sporangia seed coat exudate seed exudate seed surface seedlings septa septum soil amended soil dilution soil moisture soil samples soil smears solani f spermosphere sporangia of Pythium sporangial germination sporangial isolates sporangium spore germination sterile distilled water survival in soil survival mechanisms survival structures ultimum in soil ultimum isolates ultimum population water agar zone of influence µg glucose/g soil