Oospores associated with tomato seed may lead to seedborne transmission of<Emphasis Type="Italic">Phytophthora infestans</Emphasis> |
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Authors: | Evgenia?Rubin Email author" target="_blank">Yigal?CohenEmail author |
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Institution: | (1) Faculty of Life Sciences, Bar-Ilan University, 52900 Ramat Gan, Israel |
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Abstract: | Tomato fruits at the green mature stage were inoculated with a mixed sporangial suspension of A1 and A2 isolates ofPhytophthora infestans. Other fruits were inoculated with either A1 or A2 sporangia. Seeds were extracted from the blighted fruits and sown in soil or on agar media to test for the transmission of
late blight to the emerging seedlings. Only 23 (0.09%) of approximately 25,000 seedlings developed symptoms. All blighted
seedlings originated from fruits inoculated with mixed A1 + A2 sporangia. Isolates ofP. infestans recovered from the emerging blighted seedlings were seemingly of oosporic origin, as they differed phenotypically (mating
type, virulence, sensitivity to metalaxyl) from the parent isolates used to inoculate the fruits. The results suggest that
transmission ofP. infestans might occur by seeds extracted from fruits carrying oospores and less probably by seeds extracted from fruits having no oospores.
http://www.phytoparasitica.org posting April 30, 2004. |
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Keywords: | Potato late blight epidemiology genetics seed pathology Lycopersicon esculentum |
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