Thaxtomin A
Mostrando 1-8 de 8 artigos, teses e dissertações.
-
1. Caracterização morfológica, patogênica e molecular de linhagens de Streptomyces associadas à sarna da batata de diferentes regiões produtoras do Brasil / Morphological, pathogenic and molecular characterization of Streptomyces strains associated to potato scab from different producing areas of Brazil
A batata ocupa o quarto lugar em volume de produção mundial de alimentos após o arroz, trigo e milho. O Brasil é o maior produtor dentre os países da América Latina, porém ainda apresenta baixa produtividade devida às doenças que afetam a cultura. Dentre as doenças bacterianas, a sarna da batata é uma das mais importantes economicamente e sua ocor
Publicado em: 2011
-
2. Resistance of potato cultivars (Solanum tuberosum) to common scabies (Streptomyces spp.) and action mechanism of the phytotoxin thaxtomin A in sorghum (Sorghum bicolor): biochemical and ultrastructural aspects / Resistência de cultivares de batata (Solanum tuberosum) à sarna comum (Streptomyces spp.) e mecanismo de ação da fitotoxina taxtomina A em sorgo (Sorghum bicolor ): aspectos bioquímicos e ultraestruturais
O gênero Streptomyces constitui-se em um grupo diferenciado de procariotos fitopatogênicos, por serem morfologicamente similares aos fungos e produzirem diversos importantes metabólitos secundários. A sarna comum da batata é principal doença causada pelo gênero. O principal agente causal da doença, Streptomyces scabies, produz fitotoxinas denominadas
Publicado em: 2008
-
3. Selection and Characterization of Microorganisms Utilizing Thaxtomin A, a Phytotoxin Produced by Streptomyces scabies
Thaxtomin A is the main phytotoxin produced by Streptomyces scabies, a causal agent of potato scab. Thaxtomin A is a yellow compound composed of 4-nitroindol-3-yl-containing 2,5-dioxopiperazine. A collection of nonpathogenic streptomycetes isolated from potato tubers and microorganisms recovered from a thaxtomin A solution were examined for the ability to gr
American Society for Microbiology.
-
4. Involvement of a Cytochrome P450 Monooxygenase in Thaxtomin A Biosynthesis by Streptomyces acidiscabies
The biosynthesis of the thaxtomin cyclic dipeptide phytotoxins proceeds nonribosomally via the thiotemplate mechanism. Acyladenylation, thioesterification, N-methylation, and cyclization of two amino acid substrates are catalyzed by the txtAB-encoded thaxtomin synthetase. Nucleotide sequence analysis of the region 3′ of txtAB in Streptomyces acidiscabies 8
American Society for Microbiology.
-
5. An Arabidopsis Mutant Resistant to Thaxtomin A, a Cellulose Synthesis Inhibitor from Streptomyces SpeciesW⃞
Thaxtomin A is a phytotoxin produced by Streptomyces scabies and other Streptomyces species, the causative agents of common scab disease in potato and other taproot crops. At nanomolar concentrations, thaxtomin causes dramatic cell swelling, reduced seedling growth, and inhibition of cellulose synthesis in Arabidopsis. We identified a mutant of Arabidopsis,
American Society of Plant Biologists.
-
6. Cloning and expression of a gene from Streptomyces scabies encoding a putative pathogenicity factor.
We cloned a 9.4-kb DNA fragment from Streptomyces scabies ATCC 41973 that allows the nonpathogen Streptomyces lividans 66 TK24 to necrotize and colonize potato tuber slices and produce scab-like symptoms on potato minitubers. Deletion analysis demonstrated that activity was conferred by a 1.6-kb DNA region. Sequence analysis of a 2.4-kb DNA fragment spanning
-
7. Isolation and Identification of Actinobacteria from Surface-Sterilized Wheat Roots
This is the first report of filamentous actinobacteria isolated from surface-sterilized root tissues of healthy wheat plants (Triticum aestivum L.). Wheat roots from a range of sites across South Australia were used as the source material for the isolation of the endophytic actinobacteria. Roots were surface-sterilized by using ethanol and sodium hypochlorit
American Society for Microbiology.
-
8. Horizontal Transfer of the Plant Virulence Gene, nec1, and Flanking Sequences among Genetically Distinct Streptomyces Strains in the Diastatochromogenes Cluster
Evidence for the horizontal transfer of a pathogenicity island (PAI) carrying the virulence gene nec1 and flanking sequences among Streptomyces strains in the Diastatochromogenes cluster is presented. Plant-pathogenic, thaxtomin-producing Streptomyces strains, previously classified as S. scabiei based on the conventionally used phenotypic characteristics, we
American Society for Microbiology.