Effect of soil moisture on the pre-penetration activity of Pyricularia oryzae Cav. on rice leaf epidermis
1987
Kim, C.H. (Rural Development Administration, Suwon (Korea R.). Agricultural Sciences Inst.)
Pre-penetration activity of Pyricularia oryzae Cav. from the stage of conidia germination to appressorium formation was examined on rice leaf epidermis under light and scanning electron microscopes to determine the causes for differences in blast susceptibility between plants grown under three different soil moisture conditions in the greenhouse. No significant differences were found in the external shape of leaf epidermal cells including bulliform cells between plants grown under different soil moisture conditions. Growth and orientation of germ tube and morphology and size of appressorium of P. oryzae did not vary with soil moisture treatment. Site of appressorium formation was consistent over soil moisture treatment with the highest frequency of bulliform cell (35-48%), followed by short cell (19-27%), and long and guard cells (13-20%). No appressorium was formed on trichome. This result suggests that the observed differences in blast susceptibility between plants grown under different soil moisture conditions were not due to the differences in the pre-pentration activity of P. oryzae on those plants
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