Phosphonate inhibition in the biosynthetic pathway of polyunsaturated long chain fatty acids of Phytophthora capsici

Soulié, Marie-Christine; Malfatti, Pierrette; Demandre, Chantal; Bompeix, G.; Monéger, René

doi:10.1016/0168-9452(94)04035-f

Cited by 5 publications

(4 citation statements)

References 18 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…They are also known to interfere with uptake of phosphate in the mycelium and induce structural and metabolic changes in Phytophthora spp. (Rouhier et al, 1993;Soulié et al, 1995). In our study, increasing concentrations of AG3 phosphonate inhibited the growth of P. capsici on V8 agar medium but not in solutions.…”

Section: Effect Of Ag3 Phosphonate On Phytophthora Blight Of Bell Pepcontrasting

confidence: 53%

Effectiveness of AG3 phosphonate formulation in suppressing phytophthora blight in cucumber and bell pepper plants under growth room conditions

Abbasi

Lazarovits

Weselowski

2011

Canadian Journal of Plant Pathology

View full text Add to dashboard Cite

Phytophthora blight or crown or root rot (Phytophthora capsici Leonian) is an important disease of a wide range of plant species including peppers, tomatoes, cucumbers and other cucurbits in Canada and worldwide. We have previously demonstrated the effectiveness of a new liquid formulation of AG3 phosphonate (Calirus 150, Bromine Compounds Ltd., Beer Sheva, Israel) in suppressing pythium damping-off of cucumbers and clubroot of bok choy and cabbage. In this study, the effectiveness of AG3 phosphonate formulation to suppress phytophthora damping-off and root rot of cucumber (Cucumis sativus L.) seedlings or phytophthora blight of bell pepper (Capsicum annuum L.) plants was determined in a peat-based mix or sandy-loam soil artificially infested with soil inoculum of P. capsici under growth room conditions. In an infested peat-based mix, AG3 phosphonate preplanting amendment or postplanting drench treatments (0.05%, 0.1% and 0.2% a.i.) and a 10-min seed-soak treatment (10.45% a.i.) significantly increased the percentage of healthy cucumber seedlings and reduced damping-off and root rot severity. The seed-soak and 0.2% treatments were the most effective treatments that consistently suppressed damping-off and root rot of cucumber even in a peat-based mix infested with high inoculum levels of P. capsici. Disease severity on cucumber plants was also significantly less in the AG3 phosphonate treatments. The single drench applications of AG3 phosphonate (0.05%, 0.1% and 0.2% a.i.) significantly reduced the incidence and severity of phytophthora blight of bell pepper plants in an infested peat-based mix or a sandy-loam soil compared with the control plants receiving no treatment. The best control of phytophthora blight of bell pepper was achieved with the higher rate (0.2% a.i.) in both peat-based mix and soil with 90% of the plants remaining healthy compared with none in the control. The disease protection increased with increasing concentrations of AG3 phosphonate in both bell peppers and cucumbers without any phytotoxicity.Résumé: La brûlure phytophtoréenne, ou pourriture phytophtoréenne des tiges et du collet (Phytophthora capsici Leonian), est une grave maladie qui, au Canada comme partout dans le monde, touche une grande variété d'espèces dont les poivrons, les tomates, les concombres et d'autres cucurbitacées. Nous avons auparavant démontré l'efficacité d'une nouvelle formulation liquide de phosphonate AG3 (Calirus 150, Bromine Compounds Ltd., Beer Sheva, Israël) quant à l'inhibition de la fonte des semis chez le concombre et de la hernie chez le chou et le pak-choï. Dans cette étude, l'efficacité de la formulation de phosphonate AG3 quant à l'inhibition de la fonte phytophtoréenne des semis et de la pourriture des tiges et du collet chez les jeunes plants de concombre (Cucumis sativus), ou de la pourriture des fruits chez le poivron (Capsicum annuum L.), a été démontrée, en chambre de culture, dans un mélange à base de tourbe ou dans un terreau sableux infectés artificiellement avec un inoculum de P. capsici. Dans ...

show abstract

Section: Effect Of Ag3 Phosphonate On Phytophthora Blight Of Bell Pepcontrasting

confidence: 53%

Effectiveness of AG3 phosphonate formulation in suppressing phytophthora blight in cucumber and bell pepper plants under growth room conditions

Abbasi

Lazarovits

Weselowski

2011

Canadian Journal of Plant Pathology

View full text Add to dashboard Cite

show abstract

“…Overall, the distribution of polar lipids reflected well the profile reported by Brushaber et al (1972) except for the higher proportion of PtdSer observed in their investigation. The proportions of phosphoglycerides (with PtdCho > PtdEtn > PtdIns as the major components) is in good agreement with other Phytophthora species (Bowman & Mumma, 1967;Soulié et al, 1995). We took great care to prevent lipid degradation occurring during extraction and analysis (see the Materials and Methods) and such phenomena may explain the variable amounts of PtdOH reported in some earlier studies (discussed by Lösel, 1988).…”

Section: Discussionsupporting

confidence: 89%

“…The lipid content for P. infestans reported here is of the same order as that published for Phytophthora capsici (Soulié et al . 1995) and for P. infestans and other Phytophthora species by Lösel (1988).…”

Section: Discussionsupporting

confidence: 85%

“…The lipid content for P. infestans reported here is of the same order as that published for Phytophthora capsici (Soulié et al 1995) and for P. infestans and other Phytophthora species by Lösel (1988). Moreover, variations in total lipid content due to different growth conditions have been observed for similar organisms and reported for a related pythiaceous organism, Pythium ultimum (Bowman & Mumma, 1967).…”

Section: Discussionmentioning

confidence: 99%

See 1 more Smart Citation

Effect of culture conditions on the lipid composition of Phytophthora infestans

Griffiths

Dancer²,

O’Neill³

et al. 2003

New Phytologist

View full text Add to dashboard Cite

Summary• Phytophthora infestans is one of the most important of all plant pathogens and there is a demand for its more effective control. One target area for pesticides is lipid metabolism. To provide background information for studies with pesticides, we examined the lipids of P. infestans and how their composition is altered by culture conditions.• Phytophthora infestans was grown in a pea-broth and three different minimal media. Acyl lipids were extracted, separated by thin-layer chromatography, identified and quantified. Total fatty acid patterns and those in individual lipid classes were measured by gas-liquid chromatography.• Major polar lipids were the phosphoglycerides, phosphatidylcholine > phosphatidylethanolamine > phosphatidylinositol. The proportion of total polar lipids was reduced in minimal media. The similar fatty acid patterns of phosphatidylcholine and phosphatidylethanolamine were consistent with their metabolic relationship. Phytophthora infestans contained significant amounts of 22C unsaturated fatty acids, in addition to common fungal or oomycete fatty acids. Growth on minimal media caused changes in fatty acid patterns with increases in palmitate and linoleate and decreases in oleate being most obvious. Particular changes were also associated with the specific fatty acid patterns of individual lipids.• The changes found in total fatty acids and in the acyl profiles of individual lipids suggest that desaturase activities are altered by growth conditions. These results and the greater proportions of storage triacylglycerol in minimal media agree with data for some other lower plants or fungi.

show abstract

Greenhouse and field evaluations of potassium phosphonate: the control of Phytophthora foot rot of black pepper in Vietnam

Trường

Burgess

Liew

2012

Archives Of Phytopathology And Plant Protection

View full text Add to dashboard Cite

Phosphonate inhibition in the biosynthetic pathway of polyunsaturated long chain fatty acids of Phytophthora capsici

Cited by 5 publications

References 18 publications

Effectiveness of AG3 phosphonate formulation in suppressing phytophthora blight in cucumber and bell pepper plants under growth room conditions

Effectiveness of AG3 phosphonate formulation in suppressing phytophthora blight in cucumber and bell pepper plants under growth room conditions

Effect of culture conditions on the lipid composition of Phytophthora infestans

Greenhouse and field evaluations of potassium phosphonate: the control of Phytophthora foot rot of black pepper in Vietnam

Contact Info

Product

Resources

About