Phytophthora cactorum can synthesize substances needed for sexual reproduction but requires a stress factor to trigger the process
نویسندگان
چکیده
منابع مشابه
Effect of culture origin on chemical stimulation of sexual reproduction in Phytophthora and Pythium
Lecithin washed with NaCl solution was stimulatory to oospore formation of Phytophthora boehmeriae, P. sojae, P. cactorum, and Pythium aphanidermatum. Commercial glycerides of palmitic acid with 99% purity were found to contain a substance inhibitory to oospore formation. Purification with florisil column chromatography was more effective in removing the inhibitory substance than thin-layer chr...
متن کاملEffect of Steric and Nuclear Changes in Steroids and Triterpenoids on Sexual Reproduction in Phytophthora cactorum.
The comparative biological activity of 21 naturally occurring or synthetically derived steroids, 7 tetracyclic and pentacylic triterpenoids, and antheridiol incubated with cultures of Phytophthora cactorum has been examined. There was greater dependence on precise steric features of the sterol side chain than on the extent of nuclear unsaturation in inducing oospore formation. There was no sign...
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BACKGROUND Although mental stress is commonly considered to be an important trigger factor for migraine, experimental evidence for this belief is yet lacking. OBJECTIVE To study the temporal relationship between changes in stress-related parameters (both subjective and objective) and the onset of a migraine attack. METHODS This was a prospective, ambulatory study in 17 migraine patients. We...
متن کاملChemical stimulation of sexual reproduction in Phytophthora and Pythium
The genera of Phytophthora and Pythium are two of the very destructive groups of plant pathogens in the world (Plaats-Niterink, 1981; Erwin and Ribeiro, 1996). They attack mainly mature plants and young seedlings, respectively, of forest, fruit, vegetable, flower, and ornamental species. These two groups of fungi are classified in the family Pythiaceae of the Oomycetes, which is excluded from t...
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In this manuscript we summarize the role of chronic stress as a potential trigger factor for Parkinson's disease. Underlying mechanisms and stress-induced changes to the neuronal networks have been highlighted. Examples of stress induced reversible symptoms that resemble parkinsonism in humans and in animal models raise the question whether emotional stress can cause striatal degeneration in su...
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ژورنال
عنوان ژورنال: Microbiology
سال: 1998
ISSN: 1350-0872,1465-2080
DOI: 10.1099/00221287-144-4-1071