The susceptibility of plants to Agrobacterium: A discussion of the role of phenolic compounds

Cleene, M De

doi:10.1016/0378-1097(88)90237-6

Cited by 9 publications

(5 citation statements)

References 44 publications

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“…The presence of the esters in the roots is of particular interest for their potential fungitoxic activity. In fact, the caffeic derivatives are known to be toxic to microorganisms and could be involved in plant defense mechanisms (Bell 1981, Friend 1981, Harbome 1989) particularly after infection when they form the oxidized products (quinones) with the high fungitoxic character (Beckman 1987, De Cleen 1988, Harbome 1989.…”

Section: Discussionmentioning

confidence: 99%

Phenolic compounds in date palm cultivars sensitive and resistant toFusarium oxysporum

Ziouti¹,

Modafar²,

Fleuriet³

et al. 1996

Biologia plant.

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In date palm (Phoenix dactylifera L.) leaves, the main compounds of the phenolic pool were quercetin and isorhamnetin heterosides, (+)-catechin and (-)-epicatechin. Although previously observed only in date palm fruits, 5-caffeoylshikimic acid (dactylifric acid) and its positional isomers (3-caffeoylshikimic acid and 4-caffeoylshiklmic acid) were detected also in the leaves and roots. Quantitative, but not qualitative, differences between cultivars resistant and susceptible to Fusarium oxysporum f. sp. albedinis during growth period were observed.

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Section: Discussionmentioning

confidence: 99%

Phenolic compounds in date palm cultivars sensitive and resistant toFusarium oxysporum

Ziouti¹,

Modafar²,

Fleuriet³

et al. 1996

Biologia plant.

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“…syringae (3). Arbutin occurs in several species distributed among 10 dicot families, including Rosaceae, Leguminosae, and Saxifragaceae, and one monocot family, Liliaceae (7,22,28). Salicin, esculin, and helicin are also found in diverse plant families including Caprifoliaceae and Salicaceae (salicin), Compositae and Oleaceae (esculin), and Rosaceae (helicin) (4,22,28).…”

Section: Discussionmentioning

confidence: 99%

Plant signal molecules activate the syrB gene, which is required for syringomycin production by Pseudomonas syringae pv. syringae

1991

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The syrB gene is required for syringomycin production by Pseudomonas syringae pv. syringae and full virulence during plant pathogenesis. Strain B3AR132 containing a syrB::IacZ fusion was used to detect transcriptional activation of the syrB gene in syringomycin minimal medium by plant metabolites with signal activity. Among 34 plant phenolic compounds tested, arbutin, phenyl-jp-D-glucopyranoside, and salicin were shown to be strong inducers of syrB, giving rise to -1,200 U of jI-galactosidase activity at 100 ,uM; esculin and helicin were moderate inducers, with about 250 to 400 U of ,-galactosidase activity at 100 ,uM. Acetosyringone and flavonoids that serve as signal molecules in Agrobacterium and Rhizobium species, respectively, did not induce the syrB::lacZ fusion. All syrB inducers were phenolic glucosides and none of the aglucone derivatives were active, suggesting that the j}-glycosidic linkage was necessary for signal activity. Phenyl-13-D-galactopyranoside containing galactose substituted for glucose in the ,I-glycosidic linkage also lacked inducer activity. Phenolic signal activity was enhanced two-to fivefold by specific sugars common to plant tissues, including D-fructose, D-mannose, and sucrose. The effect of sugars on syrB induction was most noticeable at low concentrations of phenolic glucoside (i.e., 1 to 10 ,IM), indicating that sugars such as D-fructose increase the sensitivity of P. syringae pv. syringae to the phenolic plant signal. Besides induction of syrB, syringomycin biosynthesis by parental strain B3A-R was induced to yield over 250 U of toxin by the additions of arbutin and D-fructose to syringomycin minimal medium. These data indicate that syringomycin production by most strains of P. syringae pv. syringae is modulated by the perception of two classes of plant signal molecules and transduced to the transcriptional apparatus of syringomycin (syr) estimated to be 3.1 kb based on mapping analysis of Tn3HoHol insertions (24). Consequently, it was surmised that syrB encodes either a subunit of a multimeric synthetase protein (i.e., SR4, SR5, or both) or a positive regulatory protein which controls synthetase expression.The environmental conditions required for expression of the syrB gene correspond with those permissive to syringomycin production. Tn3HoHol mutagenesis (34) of syrB was used to obtain random transcriptional fusions to a promoterless lac operon, and a syrB::lacZ fusion that expressed high P-galactosidase activity was recombined into the chromosome of strains B301D-R and B3A-R (rifampin-resistant derivatives of different wild isolates, i.e., B301D and B3A) to generate BR132 and B3AR132, respectively (24). Iron concentration had a positive regulatory effect on the expression of the syrB::lacZ fusion in both strains similar to the iron regulatory effects on toxin production (11). The temporal expression of syrB also conformed to that of syringomycin biosynthesis, with peak activity occurring after 3 to 4 days of incubation (24). In accordance with antibiotic biosynthesis in man...

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“…platani (EL MODAFAR et al 1993 ). Moreover, oxidized polyphenolics were probably involved in vascular browning as reported in other studies (DE CLEEN 1988). Impregnation of the inoculation site by phenolic compounds with known toxicity against pathogenic microorganisms (PRUSKI et al 1988;TREUTTER and FEUCHT 1990;JAMBUNATHAN and KHERDEKAR 1991) could, along with obstructive structures (tyloses, gels), create undesirable conditions for the parasite, leading to restriction of its vertical progression.…”

Section: Discussionmentioning

confidence: 82%

Vascular modifications in Platanus acerifolia seedlings inoculated with Ceratocystis fimbriata f. sp. platani

Clérivet¹,

Modafar²

1994

European Journal of Forest Pathology

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The susceptibility of plants to Agrobacterium: A discussion of the role of phenolic compounds

Cited by 9 publications

References 44 publications

Phenolic compounds in date palm cultivars sensitive and resistant toFusarium oxysporum

Phenolic compounds in date palm cultivars sensitive and resistant toFusarium oxysporum

Plant signal molecules activate the syrB gene, which is required for syringomycin production by Pseudomonas syringae pv. syringae

Vascular modifications in Platanus acerifolia seedlings inoculated with Ceratocystis fimbriata f. sp. platani

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