Journal
AGRICULTURAL SCIENCES IN CHINA
Volume 10, Issue 2, Pages 238-245Publisher
ELSEVIER SCI LTD
DOI: 10.1016/S1671-2927(09)60310-2
Keywords
Phytophthora infestans; toxin; potato variety resistance
Categories
Funding
- Agricultural Scientific Achievements Transform Foundation, China [02EFN215300561]
- Ministry of Science and Technology of Yunnan Province, China [2002NG09]
- Modern Agriculture Industrial Technology System in Yunnan Province, China
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Plant pathogenic fungi produce mycotoxins which may lead host plants to produce disease symptoms and may have a significant positive role in the course of disease development. The putative Phytophthora infestans toxins were prepared by culturing in liquid medium (60 g rye and 10% tomato juice L-1) for 1 mon at 17 degrees C, filtering through four layers of cheesecloth and being precipitated by ammonium sulfate. The resulted putative toxin solutions were used to study the effects on 3 potato varieties (both leaf and tuber tissues). The results show that potato leaves and tubers exhibit symptoms similar to the late blight resulted from P. infestans infection. Potato varieties reacting differentially to both the toxin dilutions and toxins produced by different P. infestans isolates suggested the presence of toxin-mediated specificities between potato and P infestans. Potato leaf and tuber tissues have different and contrary reactions to the toxin. Toxin-mediated specificities are likely present between potato and P. infestans.
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