Phytotoxicity of mycolaminarans—β-1,3-glucans from Phytophthora spp

Keen, N. T.; Wang, M.C.; Bartnicki-García, S.; Zentmyer, G. A.

doi:10.1016/0048-4059(75)90062-4

Cited by 34 publications

(17 citation statements)

References 12 publications

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“…Wilting of papaya is a symptom, regularly observed in the field following infection by P. palmivora [12], which may be caused either by a blocking of the vascular system by glucans produced by the pathogen or by a direct toxic effect of these compounds [13]. Thus, the symptoms obtained in vitro were similar to those generally observed after infection in vivo.…”

Section: Discussionsupporting

confidence: 64%

In vitro expression of partial resistance toPhytophthora palmivora by shoot cultures of papaya

Sharma

Skidmore

1988

Plant Cell Tiss Organ Cult

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Shoot apices of Carica papaya were multiplied in vitro on solidified nutrient media supplemented with ct-naphthyl-acetic acid and 6-benzylaminopurine. The micropropagated shoots were inoculated in vitro, through a stem wound, with a sporangial suspension (1.2 x 10 4 sporangia ml -l ) of Phytophthora palmivora. The symptoms exhibited by the shoots in vitro were similar to those described previously for infection of the whole plant in the field. The time taken for the host tissue to become brown and to wilt and the time to sporulation of the pathogen were all recorded for each shoot of four varieties of papaya challenged with each of ten isolates of P. palmivora. Significant differences were observed between host-pathogen combinations for these variables and host-specificity was detected amongst the isolates of P. palmivora. The time taken for the shoot to wilt was positively correlated with the time to sporulation of the isolate but both these variables were negatively correlated with the time to browning of the shoot. In vitro selection for disease resistance will be useful during breeding programmes involving papaya genotypes which are maintained through clonal propagation.

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Section: Discussionsupporting

confidence: 64%

In vitro expression of partial resistance toPhytophthora palmivora by shoot cultures of papaya

Sharma

Skidmore

1988

Plant Cell Tiss Organ Cult

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“…The production of polysaccharides that induce phytotoxic effects on plants has been reported for some specific fungal pathogens such as Cephalosporium (Spalding et al 1961), Ceratocystis fagacearum (McWain and Gregory 1972), Ophiostoma ulmi (Strobel et al 1978), Fusarium solani (Thomas 1949), and several species of Phytophthora, including P. cinnamomi, P. megasperma var. sojae and P. palmivora (Keen et al 1975). Moreover, the EPS from the culture filtrates of P. cinnamomi, P. cryptogea and P. nicotianae induced severe wilting on several hosts (Woodward et al 1980).…”

Section: Discussionmentioning

confidence: 98%

Production of phytotoxic metabolites by five species of Botryosphaeriaceae causing decline on grapevines, with special interest in the species Neofusicoccum luteum and N. parvum

Martos¹,

Andolfi

Luque³

et al. 2008

Eur J Plant Pathol

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In recent years an increasing number of species of Botryosphaeriaceae have been associated with grapevine decline worldwide. Five species isolated from declining grapevines in Spain (Botryosphaeria dothidea, Diplodia seriata, Dothiorella viticola, Neofusicoccum luteum and N. parvum) were checked for toxin production in liquid cultures. Cultural conditions for all fungi were adjusted to obtain optimal production of phytotoxic culture filtrates, by growing the fungi in steady liquid cultures of Czapek-Dox broth for different time intervals. Phytotoxicity of D. seriata and N. parvum reached a maximum after 14 days while the remaining species showed the highest phytotoxicity levels after 21 days in culture. All fungi produced hydrophilic high-molecular weight compounds with phytotoxic properties. In addition, N. luteum and N. parvum produced lipophilic lowmolecular weight phytotoxins, not detected consistently among the remaining species. This led to a more exhaustive study on the phytotoxicity of N. luteum and N. parvum. Culture filtrates and corresponding extracts of both species were consistently highly phytotoxic in different assays. The gas-chromatography analysis of the acetylated O-methyl glycosides of the phytotoxic exopolysaccharides produced by N. parvum showed these substances to be composed mainly of glucose, mannose and galactose. Results suggest that phytotoxic metabolites could be involved in the virulence of both species in planta.

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“…Finally, the reported ability of fi-glucans to produce wilting symptoms in plants [18], might suggest that this glucan is the biochemical basis for pathogenicity in A. diospyri, originally described as the causative agent of Persimmon wilt [19].…”

Section: Discussionmentioning

confidence: 99%

Exocellular glucan production by Acremonium diospyri

Seviour

1983

FEMS Microbiology Letters

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Phytotoxicity of mycolaminarans—β-1,3-glucans from Phytophthora spp

Cited by 34 publications

References 12 publications

In vitro expression of partial resistance toPhytophthora palmivora by shoot cultures of papaya

In vitro expression of partial resistance toPhytophthora palmivora by shoot cultures of papaya

Production of phytotoxic metabolites by five species of Botryosphaeriaceae causing decline on grapevines, with special interest in the species Neofusicoccum luteum and N. parvum

Exocellular glucan production by Acremonium diospyri

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