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- W4245358180 abstract "Sunflower leaves were artificially inoculated with Albugo tragopogi and the infection process was studied by phase contrast microscopy. Sporangia germinated by releasing 7–11 zoospores which bore one whiplash and one tinsel flagellum. Zoospores swarmed on the leaf surface, penetrated stomata and became encysted within the sub-stomatal cavity. The encysted zoospores germinated within 8 h after inoculation and intercellular hyphae developed. Haustoria were observed within 12 h.Sporangia germinated at temperatures ranging from 4 to 35° but zoospores remained viable only at temperatures of 4–20°. Penetration by zoospores into sub-stomatal cavities occurred most frequently at 10° and encysted zoospores germinated best at 15°. Symptoms of disease failed to develop when inoculated plants were kept at temperatures of 25° or above during the prepenetration and penetration phases. Disease development was greatest when inoculated plants were exposed to 20 and 25° during the postpenetration phase. Light inhibited penetration of stomata by zoospores and germination of encysted zoospores but stimulated sporangial formation on the host. Under favourable conditions, symptoms of disease become apparent on the fifth or sixth day after inoculation." @default.
- W4245358180 created "2022-05-12" @default.
- W4245358180 date "1984-01-01" @default.
- W4245358180 modified "2023-10-14" @default.
- W4245358180 title "Not for holidays only" @default.
- W4245358180 doi "https://doi.org/10.1016/s0197-4572(84)80056-7" @default.
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