NDLI: Isolation and characterization of a melanin from Rhizoctonia solani, the causal agent of rice sheath blight

Isolation and characterization of a melanin from Rhizoctonia solani, the causal agent of rice sheath blight

Content Provider Springer Nature Link
Author Chen, Jianyi Wang, Chenjiaozi Shu, Canwei Zhu, Minghai Zhou, Erxun
Copyright Year 2015
Abstract Melanins are pigments produced by a broad variety of microorganisms including some pathogenic fungi and bacteria. This study was undertaken to isolate and identify a black pigment produced by Rhizoctonia solani, the causal agent of rice sheath blight. The profile of transmission electron microscopy showed that the cell walls of the rind tissue from black sclerotia were heavily pigmented. The black pigment was designated as Rs-melanin based on the physical and chemical properties, including its ultraviolet (UV) and infrared (IR) spectra. The physical and chemical characteristics of Rs-melanin were similar to those of commercial synthetic melanin. The effects of physical and chemical factors on the stability of Rs-melanin were examined. Results indicated that Rs-melanin was greatly affected by pH values, and bleached by strong oxidant. Precursors (shikimic acid and catechol) and inhibitors (tricyclazole and kojic acid) of the four biosynthetic pathways of known melanins were tested for their ability to promote or inhibit the synthesis of Rs-melanin. Catechol, an intermediate of the catechol pathway, was found to induce Rs-melanin deposition in the hyphal walls of R. solani when the tested strain was cultured on catechol-amended medium, suggesting that Rs-melanin was a kind of catechol melanin.
Starting Page 281
Ending Page 290
Page Count 10
File Format PDF
ISSN 09291873
Journal European Journal of Plant Pathology
Volume Number 142
Issue Number 2
e-ISSN 15738469
Language English
Publisher Springer Netherlands
Publisher Date 2015-02-20
Publisher Place Dordrecht
Access Restriction One Nation One Subscription (ONOS)
Subject Keyword Melanin Catechol melanin Rice sheath blight Rhizoctonia solani Transmission electron microscopy Plant Pathology Plant Sciences Ecology Agriculture Life Sciences
Content Type Text
Resource Type Article
Subject Plant Science Horticulture Agronomy and Crop Science

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Virulence spectrum and genetic structure of Rhizoctonia isolates associated with rice sheath blight in the northern region of India

Isolation and characterization of a melanin from Rhizoctonia solani, the causal agent of rice sheath blight

Content Provider	Springer Nature Link
Author	Chen, Jianyi Wang, Chenjiaozi Shu, Canwei Zhu, Minghai Zhou, Erxun
Copyright Year	2015
Abstract	Melanins are pigments produced by a broad variety of microorganisms including some pathogenic fungi and bacteria. This study was undertaken to isolate and identify a black pigment produced by Rhizoctonia solani, the causal agent of rice sheath blight. The profile of transmission electron microscopy showed that the cell walls of the rind tissue from black sclerotia were heavily pigmented. The black pigment was designated as Rs-melanin based on the physical and chemical properties, including its ultraviolet (UV) and infrared (IR) spectra. The physical and chemical characteristics of Rs-melanin were similar to those of commercial synthetic melanin. The effects of physical and chemical factors on the stability of Rs-melanin were examined. Results indicated that Rs-melanin was greatly affected by pH values, and bleached by strong oxidant. Precursors (shikimic acid and catechol) and inhibitors (tricyclazole and kojic acid) of the four biosynthetic pathways of known melanins were tested for their ability to promote or inhibit the synthesis of Rs-melanin. Catechol, an intermediate of the catechol pathway, was found to induce Rs-melanin deposition in the hyphal walls of R. solani when the tested strain was cultured on catechol-amended medium, suggesting that Rs-melanin was a kind of catechol melanin.
Starting Page	281
Ending Page	290
Page Count	10
File Format	PDF
ISSN	09291873
Journal	European Journal of Plant Pathology
Volume Number	142
Issue Number	2
e-ISSN	15738469
Language	English
Publisher	Springer Netherlands
Publisher Date	2015-02-20
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Melanin Catechol melanin Rice sheath blight Rhizoctonia solani Transmission electron microscopy Plant Pathology Plant Sciences Ecology Agriculture Life Sciences
Content Type	Text
Resource Type	Article
Subject	Plant Science Horticulture Agronomy and Crop Science

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