Chemical modification of carotenogenesis in Gibberella fujikuroi
1986; Elsevier BV; Volume: 25; Issue: 8 Linguagem: Inglês
10.1016/s0031-9422(00)81158-9
ISSN1873-3700
AutoresJavier Ávalos, Enrique Cerdá‐Olmedo,
Tópico(s)Plant biochemistry and biosynthesis
ResumoThe wild type of the fungus Gibberella fujikuroi has no carotenoids in the dark and only moderate amounts in the light. The deep-orange mutant SG22 accumulates large amounts of carotenoids both in the light and the dark. The predominant compound is always neurosporaxanthin. β-Ionone and diphenylamine inhibit phytoene dehydrogenation, with concomitant loss of mycelial colour. A significant accumulation of lycopene has been observed only in the presence of high concentrations of α-picoline. Ethanol, propanol, dimethyl sulphoxide and α-picoline, but not 4-hydroxymercurybenzoate, result in low-levels of carotenoid accumulation by the wild type in the dark. Carotenogenesis in Gibberella is unaffected by many compounds which strongly stimulate or inhibit it in other organisms, e.g. retinol acetate, α-ionone, 2-(4-chlorophenylthio)triethylamine. HCl, nicotine, imidazole, dimethylphthalate, veratrol and cinnamic alcohol. The quantitative results suggest that Gibberella lacks a feed-back regulation of carotenogenesis similar to the one found in Phycomyces.
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