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Induction of Rishitin and Lubimin Synthesis in Potato Tuber Slices by Non-Specific Elicitors - Role of Gene Derepression.

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The stress metabolites rishitin and lubimin accumulate at relatively low concentrations (5-20 ppm) in potato tuber slices subjected to various cell-disruptive treatments including heavy metal salts, sulfhydryl reagents, metabolic inhibitors, detergents, ultraviolet light and lysosomal enzymes.

Effect of mycorrhization on the accumulation of rishitin and solavetivone in potato plantlets challenged with Rhizoctonia solani.

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The effect of colonization with the vesicular-arbuscular mycorrhizal fungus Glomus etunicatum on the content of rishitin and solavetivone was determined in potato plants cv. Goldrush challenged with Rhizoctonia solani. Mycorrhization stimulated significantly the accumulation of both phytoalexins in

The effect of rishitin on potato tonoplast vesicle and vacuole proton transport.

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Rishitin, a known potato phytoalexin, was tested for its effects on proton transport. Like the pterocarpan phytoalexins, glyceollin and phaseollin, rishitin was found to inhibit proton transport. At 100 microM rishitin, proton transport in potato tonoplast vesicles was inhibited by > 95%. This

A role for ca in the elicitation of rishitin and lubimin accumulation in potato tuber tissue.

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Calcium and strontium ions enhanced rishitin but not lubimin accumulation in tuber tissue of potato (Solanum tuberosum cv Kennebec) treated with arachidonic acid (AA). The same cations in the presence of poly-l-lysine (PL) enhanced the accumulation of lubimin more than rishitin. In contrast, Mg(2+)

Biotransformation of potato stress metabolites rishitin, lubimin, and 15-dihydro lubimin by potato and soybean cell cultures.

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Potato callus and cell suspensions of potato and soybean were exogenously supplied with potato phytoalexin rishitin, much of which was converted by both species to an unknown tenatively identified as glutinosone. Exogenous lubimin was unaffected by the potato cell culture, but was transformed to

Inhibition of phytoalexin synthesis in arachidonic Acid-stressed potato tissue by inhibitors of lipoxygenase and cyanide-resistant respiration.

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Arachidonic acid-stressed potato tuber discs synthesized the phytoalexin rishitin. This synthesis was inhibited by salicylhydroxamic acid (SHAM), and to a lesser extent by tetraethylthiuram disulfide (disulfiram). Disulfiram was less effective apparently because it was inactivated in the tuber

Novel study on the elicitation of hypersensitive response by polyunsaturated fatty acids in potato tuber.

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A GC-MS procedure was carried out for the simultaneous and unequivocal quantitation of both potato phytoalexin (rishitin and lubimin) accumulation and the rate of disappearance of polyunsaturated fatty acids (PUFA) and some of their esters tested as possible elicitors. Potato 5-lipoxygenase and

Induction of plant gp91 phox homolog by fungal cell wall, arachidonic acid, and salicylic acid in potato.

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The oxidative burst has been suggested to be a primary event responsible for triggering the cascade of defense responses in various plant species against infection with avirulent pathogens or pathogen-derived elicitors. The molecular mechanisms of rapid production of active oxygen species (AOS),

FT-ICR/MS and GC-EI/MS metabolomics networking unravels global potato sprout's responses to Rhizoctonia solani infection.

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The complexity of plant-pathogen interactions makes their dissection a challenging task for metabolomics studies. Here we are reporting on an integrated metabolomics networking approach combining gas chromatography/mass spectrometry (GC/MS) with Fourier transform ion cyclotron resonance/mass

Induction of a polyubiquitin gene (ubi1) by potato phytoalexins and heat shock in Gibberella pulicaris.

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Gibberella pulicaris, a causal agent of potato dry rot, infects potato tubers via wounds, where it is exposed to the phytoalexins rishitin and lubimin. Incubation of mycelium on agar supplemented with phytoalexins transiently induced the transcription of a polyubiquitin gene consisting of four

RNAi of the sesquiterpene cyclase gene for phytoalexin production impairs pre- and post-invasive resistance to potato blight pathogens.

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Potato antimicrobial sesquiterpenoid phytoalexins lubimin and rishitin have been implicated in resistance to the late blight pathogen, Phytophthora infestans and early blight pathogen, Alternaria solani. We generated transgenic potato plants in which sesquiterpene cyclase, a key enzyme for

Enhanced production of antimicrobial sesquiterpenes and lipoxygenase metabolites in elicitor-treated hairy root cultures of Solanum tuberosum.

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Potato (Solanum tuberosum) hairy root cultures, established by infecting potato tuber discs with Agrobacterium rhizogenes, were used as a model system for the production of antimicrobial sesquiterpenes and lipoxygenase (LOX) metabolites. Of the four sesquiterpene phytoalexins (rishitin, lubimin,

An in vitro control mechanism for potato stress metabolite biosynthesis.

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Ethylene/oxygen (E/O(2)) elevates sesquiterpenoid stress metabolite (SSM) levels in potato (Solanum tuberosum L.) tuber tissue which is reacting hypersensitively. To determine whether E/O(2) retards SSM turnover, a measured amount of rishitin was applied to tuber tissue which was then incubated in

Effects of Controlled Atmospheres on Production of Sesquiterpenoid Stress Metabolites by White Potato Tuber: Possible Involvement of Cyanide-resistant Respiration.

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Levels of katahdinone (solavetivone), lubimin, rishitin, and phytuberin, sesquiterpenoid stress metabolites of white potato (Solanum tuberosum), were monitored in tuber slices which were challenged with an extract of Phytophthora infestans and incubated under controlled atmospheres. A mixture of

Involvement of 3-hydroxy-3-methylglutaryl coenzyme a reductase in the regulation of sesquiterpenoid phytoalexin synthesis in potato.

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The importance of 3-hydroxy-3-methylglutaryl coenzyme A reductase (HMG-CoA reductase) in the regulation of sesquiterpenoid phytoalexin accumulation in potato (Solanum tuberosum L. cv Kennebec) was examined. Wounding of potato tubers produced a large temporary increase in HMG-CoA reductase activity

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