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2 edition of Ecological and physiological studies on tabtoxin production by Pseudomonas syringae pv. tabaci. found in the catalog.

Ecological and physiological studies on tabtoxin production by Pseudomonas syringae pv. tabaci.

Daoud Harzallah

Ecological and physiological studies on tabtoxin production by Pseudomonas syringae pv. tabaci.

by Daoud Harzallah

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  • 31 Currently reading

Published by University of East Anglia in Norwich .
Written in English


Edition Notes

Thesis (M.Phil.), University of East Anglia, School of Biological Sciences, 1987.

ID Numbers
Open LibraryOL13910779M

Pseudomonas syringae is an important plant pathogenic bacterium commonly used to study plant-microbe interactions. More than 50 pathovars of P. syringae have been identified based on their virulence and host range. For example, P. syringae causes wildfire diseases in host tobacco plants but induces a hypersensitive response (HR) in other non-host plants Cited by: Pseudomonas syringae strain PT23 produces necrotic lesions on tomato which are surrounded by a diffuse yellow chlorosis. Mitchell et al. (Physiological Plant Pathol –) previously found that some strains of P. syringae produce the chlorosis-inducing phytotoxin, coronatine. In the present study, Tn5 mutagenesis was used to isolate Cited by:

Wildfire disease caused by Pseudomonas syringae pv. tabaci (Pst) is one of the most destructive tobacco diseases [15,16,17].This disease is characterized by the emergence of small brown or black water-soaked lesions surrounded by a broad, chlorotic halo on leaves, resulting from exotoxin production by Pst [].An integrated approach for the management of wildfire Author: Md. Nurul Islam, Md. Sarafat Ali, Seong-Jin Choi, Youn-Il Park, Kwang-Hyun Baek. Following infiltration of tobacco leaves with tabtoxin ( mg/ml) glutamine synthetase was detectably reduced after 1 hand was 5% of control levels after 4 h. No recovery was detected. Ammonia began to accumulate after 3 - 4 h. An inverse relation was shown between glutamine synthetase activity and NH3 levels in leaves infiltrated with different tabtoxin by:

  We established a causal relationship between the production of CKs by Pseudomonas fluorescens (Pfl) strain G 24,25 and its ability to control the infection of Arabidopsis by P. syringae by: Understanding the molecular mechanisms underpinning the ecological success of plant pathogens is critical to develop strategies for controlling diseases and protecting crops. Recent observations have shown that plant pathogenic bacteria, particularly Pseudomonas, exist in a range of natural environments away from their natural plant host e.g., water courses, soil, non Cited by: 1.


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Ecological and physiological studies on tabtoxin production by Pseudomonas syringae pv. tabaci by Daoud Harzallah Download PDF EPUB FB2

Physiological Plant Pathology () 25, Contribution of tabtoxin to the pathogenicity of Pseudomonas syringae pv. tabac J. TURNER arid R, R. TAHA Ychuol of Biological Sciences, University of East Anglia, Norwich NR4 7TJ, UK Areeed,Jblication April ) Eighteen spontaneous, non-toxigenic (Tox-) mutants of Pseudomonas syringae pv.

tabaci were found Cited by: Harzallah D () Ecological and physiological studies on tabtoxin production by Pseudomonas syringae pv.

tabaci. MPhil thesis University of Cited by: 3. Abstract. Sixteen tabtoxin-producing strains of Pseudomonas syringae pv. tabaci were grown in Woolley’s medium to mid-log phase (48 h), and tested for their ability to hydrolyze tabtoxin by the action of a Zn metallopeptidase in the periplasm.

Analysis after 1h incubation with 1μM Zn showed: 11 tabaci and 3 tabaci (angulata) strains required Zn for activity; 2 tabaci strains Author: R. Durbin, T. Uchytil. Pseudomonas syringae pv. tabaci BR2 produces tabtoxin and causes wildfire disease on tobacco and bean plants.

Approximately 2, Tn5 insertion mutants of a plasmid-free strain, PTBRwere. The present study describes a system based on PCR to distinguish tabtoxin-producing strains of Pseudomonas syringae from other Ps.

syringae plant pathogens that produce chlorosis-inducing phytotoxins. One of 18 spontaneous, non-toxigenic (Tox-) mutants of P. syringae pv. tabaci which caused symptomless infections in tobacco leaves was selected for detailed study.

Infected tissue displayed none of the physiological alterations (loss of chlorophyll, accumulation of ammonia, inactivation of glutamine synthetase) that characterized the effect of tabtoxin in infections Cited by: Eighteen spontaneous, non-toxigenic (Tox-) mutants of Pseudomonas syringae pv.

tabaci were found to cause symptomless infections in tobacco leaves. One of these mutants was selected for detailed study. Infected tissue displayed none of the physiological alterations (loss of chlorophyll, accumulation of ammonia, inactivation of glutamine synthetase) that characterized the effect of tabtoxin.

In this study, we observed that the jaz4‐1 mutant of Arabidopsis is hyper‐susceptible to Pseudomonas syringae pv. tomato (Pst) DC, while Arabidopsis lines overexpressing a. Tabtoxin is a monocyclic β-lactam produced by P. syringae pv.

tabaci, coronafaciens, and garcae. Pseudomonas syringae pv. tabaci, the causal agent of the wildfire of tobacco, produces the phytotoxin tabtoxin. tabtoxin-producing bacterium, P. syringae BR2, causes a disease of bean (Phaseolus vulgaris) similar to tobacco Number: P.

syringae EM1, P. syringae LS3, P. syringae Q, P. syringae pv tomato DC and P. savastanoi pv glycinea B were all able to produce coronatine (Table 3). Effects of nutritional factors on production of tabtoxin, a phytotoxin, by Pseudomonas syringae pv.

tabaci. Dehbi F(1), Harzallah D, Larous L. Author information: (1)Institut National de la Recherche Agronomique d'Algerie, UR, Setif: Dehbi F, Harzallah D, Larous L. l-Amino Acid Ligase from Pseudomonas syringae Producing Tabtoxin Can Be Used for Enzymatic Synthesis of Various Functional Peptides Toshinobu Arai, Yasuhiro Arimura, Shun Ishikura, Kuniki Kino Applied and Environmental Microbiology Jul79 (16) ; DOI: /AEMCited by: Tabtoxin is a chlorosis-inducing toxin produced by the plant pathogenic bacterium Pseudomonas syringae pv.

tabaci. Previous studies have indicated that tabtoxin inhibits glutamine synthetase (EC 6 Author: John G Turner. The bacteria were prepared by streaking stock cultures onto plates of modified Woolley's medium [22] Toxin production by strains of P.s.

tagetis TABLE 1 Strains of Pseudomonas syringae pv. tagetis and their characteristics Host Strain Tagetes erecta T. erecta T. erecta A l B4 C42 C42m' C42md D I F10 G 1 H15 II T. erecta Ambrosia Cited by:   Six oriental cultivars of tobacco (Nicotiana tabacum L.) were evaluated for transformation and foreign gene expression.

Leaf-disc explant tissue was transformed with Agrobacterium tumefaciens strain LBA carrying the plasmid pARK21, which contains NPTII gene and ttr (tabtoxin resistance) gene conferring the resistance to Pseudomonas syringae pv. by: Pseudomonas syringae is a phytopathogenic bacterium present in a wide variety of host plants where it causes diseases with economic impact.

The symptoms produced by Pseudomonas syringae include chlorosis and necrosis of plant tissues, which are caused, in part, by antimetabolite toxins. This category of toxins, which includes tabtoxin, phaseolotoxin and Cited by: A comparative study of Bacterium tabacum Wolf and Foster and Bacterium angulata Fromme and Murray.

Phytopathology – Google Scholar. Drahos DJ, Hemming BC and McPherson S, () Identification and Isolation of a DNA Region Required for Tabtoxin Production: Apparent Deletion in Pseudomonas Syringae Pv Tabaci Variant Cited by: 4. Pseudomonas syringae causes a wide range of symptoms on plants including blights, leaf spots, and galls.

Phytotoxins generally enhance the virulence of phytopathogenic P. syringae, and their synthesis can substantially increase disease severity. Although several P. syringae phytotoxins cause chlorosis (coronatine, phaseolotoxin, and tabtoxin), they are Cited by: 75 strains of 21 various Pseudomonas syringae (P.) pathovars were investigated in different tests for their toxin production.

Data from literature about the production of the known phytotoxins phaseolotoxin (pv. phaseolicola), tabtoxin (pv. coronafaciens, pv. tabaci), coronatine (pv. atropurpurea, pv. glycinea, by: Persicomycins are phytotoxic compounds synthesized by Pseudomonas syringae ae.

Their production by several strains from various geographical origins was investigated in vitro. A gradient of production was scored among strains ranging from low to high producers using high performance liquid by: 5.

This toxin is produced by P. syringae pv. tabaci, pv. coro-nafaciens and pv. garcae [3]. The biosynthetic pathway of tabtoxin is not well understood, and tabtoxin biosynthesis may diverge from the lysine biosynthetic pathway prior to the formation of diaminopimelate [4,5].

A genetic analysis of tabtoxin production revealedthepresenceofbiosyn. Effects of nutritional factors on production of tabtoxin, a phytotoxin, by Pseudomonas syringae pv. tabaci. Dehbi F, Harzallah D, Larous L.

Meded Rijksuniv Gent Fak Landbouwkd Toegep Biol Wet, 66(2a), 01 Jan Cited by: 0 articles | .Background. Pseudomonas syringae is one of the most ubiquitous plant pathogens, causing various economically important diseases [].The present study focuses on P.

syringae pv. syringae UMAF (CECT ) which causes apical necrosis of mango [2,3].The antimetabolite mangotoxin is a key virulence factor of strain UMAF [4,5].This toxin is Cited by: