Protection from Ultraviolet Irradiation by Melanin of Mosquitocidal Activity of Bacillus thuringiensis var. israelensis

Liu, Yu-Tien; Sui, Meng-Jiun; Ji, Dar-Der; Wu, I-Huan; Chou, Chin-Chi; Chen, Cheng-Chen

doi:10.1006/jipa.1993.1088

Cited by 69 publications

(41 citation statements)

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“…Photoprotection of the mosquitocidal activity of B. thuringiensis israelensis, using melanin produced by Streptomycete, has been studied (Liu et al, 1993). It was shown that melanin is an excellent photoprotective agent.…”

Section: Introductionmentioning

confidence: 99%

Characterization of melanin produced by a wild-type strain of Bacillus thuringiensis

Chen

Yinyue

Wang

et al. 2004

J. Gen. Appl. Microbiol.

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Bt L-7601 is a UV resistant wild-type strain, which belongs to Bacillus thuringiensis subsp. dendrolimus serotype H4a4b. It was isolated from nature, and produced a dark brown pigment during the exponential phase of growth. Bt L-7601 had the ability to produce pigment in a general nutrition-abundant medium, which had no L-tyrosine. The pigment was identified as melanin based on chemical testing, its light absorbance, and FT-IR analysis. Bt L-7601 has a strong resistance to UV light. After 30 min irradiation its survival rate was 17 times higher than that of the strain B. thuringiensis subsp. colmeri 15A3, which had no pigment. Results of the bioassays of residual insecticidal activity of Bt formulation with and without pigment produced by Bt L-7601 against larvae of Helicoverpa armigera and Spodoptera exigua after exposure to UV irradiation showed that the pigment is an excellent UV protective agent for the insecticidal proteins.

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Section: Introductionmentioning

confidence: 99%

Characterization of melanin produced by a wild-type strain of Bacillus thuringiensis

Chen

Yinyue

Wang

et al. 2004

J. Gen. Appl. Microbiol.

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“…More recently, Bt strain engineering efforts have mainly focused in extending Bt host range and potency by creating strains harbouring unique combinations of crystal proteins not as yet found in nature and in increasing the duration of the Bt products applied in the field. To protect the crystal proteins from UV degradation Liu and collaborators initially used a Streptomyces lividans strain containing a recombinant plasmid allowing production of high amounts of melanin (Liu et al 1993). The melanin obtained by the fermentation of Streptomyces lividans was added into a Bacillus thuringiensis var.…”

Section: Development Of Recombinant Bt Strainsmentioning

confidence: 99%

Genetic Improvement of Bt Strains and Development of Novel Biopesticides

Sanchis¹

2012

Bacillus Thuringiensis Biotechnology

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This review describes how recombinant DNA technology has been used to improve Bacillus thuringiensis (Bt) products and overcome a number of the problems associated with Bt-based insect control measures. It will discuss how the knowledge of the genetics of Bt and of its insecticidal toxin genes, the understanding of their regulation and the development of cloning vectors has made possible the continuing improvement of first generation products. Several examples describing how biotechnology has been used to increase the production of insecticidal proteins in Bt, their persistence in the field by protecting them against UV degradation or to construct non-viable genetically modified strains, will be presented.

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“…Research has revealed that melanin produced by Streptomycete showed photoprotection and mosquitocidal activity of Bacillus thuringiensis sub sp. Israelensis (Liu et al, 1993). In the microorganisms, melanin acts as a protective agent against environmental stresses.…”

Section: Article Infomentioning

confidence: 99%

Production, Extraction and Partial Purification of Melanin Pigment from Pathogenic Klebsiella pneumoniae HM Isolated from Clinical Samples

Saud¹,

Alaubydi²

2016

Int.J.Curr.Microbiol.App.Sci

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Protection from Ultraviolet Irradiation by Melanin of Mosquitocidal Activity of Bacillus thuringiensis var. israelensis

Cited by 69 publications

References 0 publications

Characterization of melanin produced by a wild-type strain of Bacillus thuringiensis

Characterization of melanin produced by a wild-type strain of Bacillus thuringiensis

Genetic Improvement of Bt Strains and Development of Novel Biopesticides

Production, Extraction and Partial Purification of Melanin Pigment from Pathogenic Klebsiella pneumoniae HM Isolated from Clinical Samples

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