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Factors Affecting Germination of Oospores of Phytophthora infestans
Author(s) -
Chang T. T.,
Ko W. H.
Publication year - 1991
Publication title -
journal of phytopathology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.53
H-Index - 60
eISSN - 1439-0434
pISSN - 0931-1785
DOI - 10.1111/j.1439-0434.1991.tb00134.x
Subject(s) - oospore , phytophthora infestans , germination , biology , botany , spore , mating type , phycomycetes , horticulture , inoculation , blight , biochemistry , gene
When oospores from the pairing between A 1 and A 2 mating types of Phytophthora infestans were treated with 0.25 % KMnO 4 solution for 15 min and incubated at 19 °C under light on a modified S+L medium, germination commenced within 4 days and reached about 70 % after 20 days. Under these conditions, more than 25 % of oospores obtained from a 4‐day‐old culture germinated. To obtain a high germination rate of P. infestans oospores, light was essential during germination but not during growth and oospore formation. The optimum time for activation of oospores with 0.25 % KMnO 4 was 15 to 30 min and a suitable concentration of KMnO 4 for 15 min activation was 0.25 to 0.45 %.