Publikation: Activation of Teliospore Germination in Uromyces appendiculatus var. appendiculatus. II. Light and Host Volatiles
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The effects of light and host volatiles on teliospore germination in Uromyces appendiculatus var. appendiculatus were studied.
1. Light intensities ranging 15-26000 lux supported teliospore germination and basidiospore formation. The optimum light intensity was 17000 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 light --> 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.
Zusammenfassung in einer weiteren Sprache
Die Aktivierung der Teleutosporenkeimung bei Uromyces appendiculatus var. appendiculatus durch Licht, Lichtrhythmen und flüchtige Substanzen aus Bohnenkeimlingen wurde untersucht.
1. Gute Teleutosporenkeimung wurde bei 17000 lux beobachtet. Ein Licht-Dunkel-Wechsel war für den Keimprozeß notwendig; unter Dauerlicht- oder Dauerdunkelbedingungen fand keine Keimung statt. Teleutosporenkeimung, Basidiosporenausbildung und -abschleuderung verliefen in strenger Gesetzmäßigkeit. Das auslösende Signal für die Keimung war der Beginn der Dunkelperiode (d. h. der Phasenwechsel von Licht ---> Dunkel), wobei die maximale Basidiosporenabschleuderung ca. 7 h nach dem Ausschalten des Lichtes stattfand. Unter Lang-Tag-Bedingungen wies die Abschleuderung der Basidiosporen eine nocturnale Periodik auf.
2. Fünfzehn Tage nach einer l0tägigen Behandlung mit flüchtigen Substanzen aus keimenden Bohnensamen waren 70-80 % der behandelten Teleutosporen ausgekeimt. Inokulationen mit Basidiosporen von behandelten Teleutosporen führten zu hohen Infektionsraten.
3. Die Behandlung mit Wärme und Bohnenkeimlingen hatte auf ruhende Teleutosporen von sechs anderen Rostpilzarten keinen signifikanten Einfluß auf ihre Keimung.
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GOLD, Randall E., Kurt MENDGEN, 1983. Activation of Teliospore Germination in Uromyces appendiculatus var. appendiculatus. II. Light and Host Volatiles. In: Phytopathologische Zeitschrift. 1983, 108(3-4), pp. 281-293. ISSN 0931-1785. eISSN 1439-0434. Available under: doi: 10.1111/j.1439-0434.1983.tb00589.xBibTex
@article{Gold1983Activ-7211, year={1983}, doi={10.1111/j.1439-0434.1983.tb00589.x}, title={Activation of Teliospore Germination in Uromyces appendiculatus var. appendiculatus. II. Light and Host Volatiles}, number={3-4}, volume={108}, issn={0931-1785}, journal={Phytopathologische Zeitschrift}, pages={281--293}, author={Gold, Randall E. and Mendgen, Kurt} }
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