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Activation of Teliospore Germination in Uromyces appendiculatus var. appendiculatus 1 )
Author(s) -
Gold R. E.,
Mendgen K.
Publication year - 1983
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.1439-0434.1983.tb00589.x
Subject(s) - germination , basidiospore , biology , seedling , spore , botany , spore germination , light intensity , horticulture , physics , optics
The effects of light and host volatiles on teliospore germination in Uromyces appendiculatus var. appendiculatus were studied. 1. Light intensities ranging 15–26 000 lux supported teliospore germination and basidiospore formation. The optimum light intensity was 17 000 lux under the described conditions. Light‐dark alternation was necessary for teliospore germination: no germination occurred under continuous light or continuous dark conditions. The process of teliospore germination, basidiospore formation, and basidiospore release followed a synchronous, rhythmic pattern of development. Teliospore germination was triggered by the phase change lights → dark (i.e. “light off”). Under long‐day conditions basidiospore release exhibited a nocturnal periodicity with peak maxima occurring ∼ 7 h after light was turned off. 2. Fifteen days after a 10 d exposure to host volatiles, 70–80 % of the treated spores germinated; minor increases in spore mortality were observed. Inoculations made with seedling‐treated teliospores resulted in heavy pycnial infections. 3. The heat and seedling activation methods developed for teliospores of bean rust proved ineffective when applied to dormant teliospores from six other unrelated rust species.