Production of Gibberellin-Like Substances by Bacteria and Actinomycetes

Katznelson, H.; Cole, Shirley E.

doi:10.1139/m65-097

Cited by 81 publications

(20 citation statements)

References 16 publications

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“…As stated in several reports, Streptomyces activity in plants not only protects against pathogens, but the metabolic products of Streptomyces also influence plant growth and physiology (Katznelson & Cole, 1965;Mishra et al, 1987). As 5,7-dimethoxy-4-p-methoxylphenylcoumarin has been isolated from numerous plants, but not from members of the Zingiberaceae, further investigations are necessary to determine the relationship between 5,7-dimethoxy-4-pmethoxylphenylcoumarin and this plant family.…”

Section: Discussionmentioning

confidence: 99%

Secondary metabolites from endophytic Streptomyces aureofaciens CMUAc130 and their antifungal activity

et al. 2005

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Streptomyces aureofaciens CMUAc130 was isolated from the root tissue of Zingiber officinale Rosc. (Zingiberaceae). It was an antagonist of Colletotrichum musae and Fusarium oxysporum, the causative agents of anthracnose of banana and wilt of wheat, respectively. Evidence for the in vitro antibiosis of S. aureofaciens CMUAc130 was demonstrated by the zone of fungal-growth inhibition. Microscopic observations showed thickness and bulbous structures at the edges of the inhibited fungal hyphae. The culture filtrate and crude extract from this strain were all inhibitory to tested phytopathogenic fungi. The major active ingredients from the culture filtrate of S. aureofaciens CMUAc130 were purified by silica gel-column chromatography and identified to be (i) 5,7-dimethoxy-4-p-methoxylphenylcoumarin and (ii) 5,7-dimethoxy-4-phenylcoumarin by NMR and mass-spectral data, respectively. Bioassay studies showed that compounds (i) and (ii) had antifungal activities against tested fungi, and their MICs were found to be 120 and 150 mg ml "1 , respectively. This is the first report of compounds (i) and (ii) from micro-organisms as active ingredients for the control of phytopathogenic fungi.

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Section: Discussionmentioning

confidence: 99%

Secondary metabolites from endophytic Streptomyces aureofaciens CMUAc130 and their antifungal activity

et al. 2005

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“…The presence of actinomycetes mainly inside root tissues may play an important role in plant development and health. Several reports refer to actinomycetes acting in plant protection against pathogens and the influence of their metabolic products on plant growth and physiology (Katznelson & Cole, 1965 ;Gupta et al,1995 andKolomiets et al, 1997). In the present work, the presence of actinomycetes inside roots and leaves of a widely cultivated crop and from a tropical region was confirmed.…”

Section: Resultsmentioning

confidence: 99%

Isolation of endophytic actinomycetes from roots and leaves of maize (Zea mays L.)

Araújo

Silva

Azevedo

2000

Braz. arch. biol. technol.

110

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“…The finding that free-living Rhizobium phaseoli cultures produce GA,, GA20, and GA4, the same compounds detected in root and nodule tissue, led Atzom et al (1) to conclude that the bacteria did not elicit the production of additional types of GA within the nodule. In addition to the definitive GC-MS identifications of GAs in R. phaseoli cultures (1), other researchers have demonstrated that free-living rhizobia (including members of both the Rhizobium [fast-growing] and Bradyrhizobium [slow-growing] genera) have the capacity to produce GA-like substances (18,22,35). This evidence supports the hypothesis that at least some rhizobial strains possess the genetic and enzymic capacity to synthesize GAs.…”

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confidence: 66%

Gibberellins and the Legume-Rhizobium Symbiosis

Dobert¹,

Rood²,

Zanewich³

et al. 1992

Plant Physiol.

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Lima bean (Phaseolus lunatus L.) plants inoculated with Bradyrhizobium sp. strain 127E14 displayed a period of marked internode elongation that was not observed in plants inoculated with other compatible bradyrhizobia, including strain 127E15. When strain 127E14 nodulated an alternate host, cowpea (Vigna unguiculata L. Walp), a similar, although less dramatic growth response induced by the bacteria was observed. It has been speculated that the elongative growth promotion brought about by inoculation with strain 127E14 is mediated by gibberellins (GAs). Using deuterated internal standards and gas chromatography-mass spectroscopy analysis, we have quantified the levels of GA,, GA20, GA19, and GA44 in nodules and stems of two varieties of lima bean (bush and pole) and one variety of cowpea that were inoculated with either strain 127E14 or 127E15. In nodules formed by strain 127E14 on lima bean, endogenous levels of GA20 and GA1, were 10 to 40 times higher (35-88 ng/g dry weight) than amounts found in nodules formed by strain 127E15 (2.2-3.9 ng/g dry weight). Relative amounts of GA44 were also higher (4-to 11-fold) in 127E14 nodules, but this increase was less pronounced. The rhizobialinduced increase of these GAs in the nodule occurred in both pole and bush varieties and seemed to be independent of host morphology. Regardless of rhizobial inoculum, levels of the "bioactive" GA1 in the nodule (0.3-1.1 ng/g dry weight) were similar. In cowpea nodules, a similar, although smaller, difference in GA content due to rhizobial strain was observed. The concentration of GA1 in lima bean stems was generally higher than that observed in the nodule, whereas concentrations of the other GAs measured were lower. In contrast with the nodule, GA concentrations in lima bean stems were not greater in plants inoculated with strain 127E14, and in some cases the slower growing plants inoculated with strain 127E15 actually had higher levels of GA20, GA19, and GA". Thus, there were major differences in concentrations of the precursors to GA1 in nodules formed by the two bacterial strains, which were positively correlated with the observed elongation growth. These results support the hypothesis that the rhizobial

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Production of Gibberellin-Like Substances by Bacteria and Actinomycetes

Cited by 81 publications

References 16 publications

Secondary metabolites from endophytic Streptomyces aureofaciens CMUAc130 and their antifungal activity

Secondary metabolites from endophytic Streptomyces aureofaciens CMUAc130 and their antifungal activity

Isolation of endophytic actinomycetes from roots and leaves of maize (Zea mays L.)

Gibberellins and the Legume-Rhizobium Symbiosis

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