Cytology of Chlamydospore Development in Protomycopsis Species

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Observations on the nuclear behavior during chlamydospore development in Phaseolus mungo L. and Sesbania grandiflora Pers. by Protomycopsis patelii Pavgi and Thirumalachar and Protomycopsis thirumalacharii Pavgi respectively are described in detail. The vegetative cells and/or conidia from diploid mycelia are pathogenic in the 2 species. Numerous chlamydospores typical of the species form the terminal sporogenous cells of the permeating hyphae within the infection epicenter. No vascular infection was noted. No haustoria were developed by any of the species. Pathological effects were observed on the host cells without any stimulation for cell multiplication and enlargement. Comparison was made on chlamydospore development in species of allied genera in the family Protomycetaceae.