Fatty acids triggering coremia formation by Ceratocystis ulmi their occurrence and distribution in elm wood

Hubbes, M.; Neumann, P.; Willemot, C.

doi:10.1111/j.1439-0329.1977.tb00566.x

Cited by 15 publications

(11 citation statements)

References 9 publications

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“…Les deux souches de C.jmbriata rkagissent de la mCme faqon que sur le bois de pin. Hubbes et al (1977) ont Ctabli que la formation d'organes de fructification pouvait Ctre influencCe par les substances contenues dans le bois. Pour prkciser l'action de ces substances sur le dkveloppement des corkmies et des pkrithkces, on incorpore au milieu nutritif, soit directement un extrait 2 l'eau, soit un extrait au chloroforme par lYintermCdiaire de rondelles de papier-filtre imprkgnCes de ces substances.…”

Section: Resultatsunclassified

“…L'acide linoltique, stimulateur de cortmies chez C . ulmi et C. piceae, a kt6 identifit dans les extraits au chloroforme d'orme et de sapin (Hubbes 1975 (Hubbes et al 1977): 1,s g KH2P04, 1 g MgS04.7 H20, 0 , l g CaC12, 0 , l mg FeC13, 0,l mg MnS04, 0,l g NaHCO,, 1 g de glucose, 5 mg de pyridoxine, 5 mg de thiamine, 5 mg de biotine, 5 mg de nicotinamide, 5 mg de riboflavine, 232 mg d'acide fumarique, …”

Section: Introductionunclassified

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Croissance et fructification de Ceratocystis spp. avec attention particulière à C. piceae et C. fimbriata, en fonction du substrat

Thuillier¹,

Neumann²

1982

Can. J. Bot.

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Ceratocystis coerulescens, C. fimbriata, C. ips, and C. minor were tested for production of sexual fruiting bodies, and C. penicillata and C. piceae for asexual fruiting bodies. Ceratocystis fimbriata produced perithecia easily on standard culture media, but there were marked differences between the two strains tested (503, 560). Strain 503 had a good production of fruiting bodies on malt agar (M) and a basal nutrient solution (N). Strain 560 fared better than 503 on Leonian agar (L), but did not fructify on M and N. Supplementing media with various wood extracts produced better results. M + maple sapwood extracts and L + poplar sapwood extracts gave the best results with strain 503, and L + pine sapwood extracts was the best with strain 560.Production of coremia was also influenced by the basal medium and the kind of extracts added as supplements. Fir and maple extracts stimulated the production of fruiting bodies, whereas pine and poplar extracts had no or very little stimulating effects. In every other species tested, the production of fruiting bodies was none or very irregular. [Journal translation]

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Section: Resultatsunclassified

Section: Introductionunclassified

Croissance et fructification de Ceratocystis spp. avec attention particulière à C. piceae et C. fimbriata, en fonction du substrat

Thuillier¹,

Neumann²

1982

Can. J. Bot.

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“…In the DED pathogens, addition of linoleic acid to a complex growth medium (potato dextrose agar) was found to induce the formation of asexual spore bearing structures called synnemata (formerly known as coremia) (Hubbes 1975). Furthermore, Hubbes et al (1977) observed a high concentration of linoleic acid in elm sapwood and bark in June, and a decrease of this PUFA in heartwood. This would support the involvement of linoleic acid in the production of synnemata, since the latter are found in elm bark beetle breeding galleries under the bark (Hubbes et al 1977).…”

Section: R a F Tmentioning

confidence: 87%

Effect of linoleic acid on reproduction and yeast–mycelium dimorphism in the Dutch elm disease pathogens

Naruzawa

Malagnac

Bernier

2016

Botany

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Elm populations from North America and Europe were devastated by Dutch elm disease (DED), which is a vascular disease caused by fungi from the genus Ophiostoma (Ascomycota). These pathogens feature a yeast–mycelium dimorphism that may be related to virulence by facilitating colonization of the host xylem. Cyclooxygenases (COX) have been proposed to modulate yeast–mycelium dimorphism of DED fungi, and homologs of cox genes have been found in the nuclear genome of O. novo-ulmi subsp. novo-ulmi. Linoleic acid, a substrate for COX, was reported to stimulate the formation of asexual and sexual reproduction structures in DED strains grown on complex media. We hypothesized that linoleic acid also induced mycelium production in liquid shake culture conditions. Linoleic acid was found to enhance the production of reproductive structures in sexual crosses conducted on a complex medium (elm sapwood agar), but was not sufficient for these structures to form on a minimal medium. In liquid shake cultures grown in a minimal medium, the addition of linoleic acid stimulated mycelial formation. Our results suggest that linoleic acid plays a role in reproduction and dimorphism in the DED pathogens.

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“…The exact nature of the pigment produced in the stalk is not known, but some workers have hypothesized it is probably melanin (9,10). Linoleic acid, required for best synnema production on SPM (12), has been found in elm wood and associated with synnema production on that substrate (15). Therefore, linoleic acid, or a metabolite for this fatty acid, whether in elm wood or SPM, may be required for synnema and (or) pigment formation by C. ulmi.…”

Section: Discussionmentioning

confidence: 97%

Cultural characteristics, pathogenicity predictions, and pathogenicity tests for some isolates of Ceratocystis ulmi

Hindal¹,

Harner²,

MacDonald³

1981

Can. J. Bot.

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Ceratocystis ulmi isolates of known pathogenicity were culturally characterized on a defined synnema production medium (SPM) and American elm wood disks. More aggressive isolates generally produced more synnemata and mycelial pigment on SPM and more synnemata on the wood disks than less aggressive ones. There was no relationship between pathogenicity and radial growth or aerial mycelium production on SPM. Multivariate discriminant analyses on synnema and pigment production and radial growth on SPM and univariate discriminant analyses on synnema production on the wood disks accurately classified the isolates of known pathogenicity into their respective pathogenicity classes. Isolates of unknown pathogenicity also were characterized on SPM and elm wood disks, and pathogenicity predictions made for them using discriminant analyses. Five isolates predicted to be less aggressive were selected for pathogenicity testing, and four were less pathogenic in American elm than a known more aggressive isolate.

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Fatty acids triggering coremia formation by Ceratocystis ulmi their occurrence and distribution in elm wood

Abstract: This paper reports the identification of fatty acids in elm wood and its active extractives triggering coremia formation, their distribution between bark, sapwood and heartwood of elms, and their occurrence in the mycelium of the pathogen.

Cited by 15 publications

References 9 publications

Croissance et fructification de Ceratocystis spp. avec attention particulière à C. piceae et C. fimbriata, en fonction du substrat

Croissance et fructification de Ceratocystis spp. avec attention particulière à C. piceae et C. fimbriata, en fonction du substrat

Effect of linoleic acid on reproduction and yeast–mycelium dimorphism in the Dutch elm disease pathogens

Cultural characteristics, pathogenicity predictions, and pathogenicity tests for some isolates of Ceratocystis ulmi

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