Saline and alkaline soil stress results in enhanced susceptibility to and severity in tomato pith necrosis when inoculated with either Pseudomonas corrugata and/or P. fluorescens

2020 ◽  
Vol 102 (3) ◽  
pp. 849-856
Author(s):  
Yasser E. Ibrahim ◽  
Mahmoud H. El Komy ◽  
Naglaa M. Balabel ◽  
Younis K. Hamad ◽  
Mohammed A. Al-Saleh
Keyword(s):  
Alkaline Soil ◽  
Pseudomonas Corrugata ◽  
Soil Stress ◽  
Pith Necrosis

Tomato pith necrosis caused by Pseudomonas corrugata n. sp.

1978 ◽  
Vol 88 (1) ◽  
pp. 105-114 ◽  
Author(s):  
CAROLINE M. SCARLETT ◽  
J. T. FLETCHER ◽  
PAULINE ROBERTS ◽  
R. A. LELLIOTT
Keyword(s):  
Pseudomonas Corrugata ◽  
Pith Necrosis

Pseudomonas corrugata. [Descriptions of Fungi and Bacteria].

1987 ◽  
Author(s):  
J. F. Bradbury
Keyword(s):  
Geographical Distribution ◽  
Adventitious Roots ◽  
Soil Conditions ◽  
High Humidity ◽  
High Nitrogen ◽  
Pseudomonas Corrugata ◽  
Nitrogen Levels ◽  
Medicago Saliva ◽  
Pith Necrosis ◽  
Bacterial Exudate

Abstract A description is provided for Pseudomonas corrugata. Information is included on the disease caused by the organism, its transmission, geographical distribution, and hosts. HOSTS: Lycopersicon esculentum. Also isolated from symptomless roots of Medicago saliva. DISEASE: Tomato pith necrosis. The pith is discoloured brown to dark brown and may show cavities, especially in the lower parts of the stem. External symptoms frequently seen include chlorosis of upper leaves, sometimes a brown to black external stem lesion where the pith is most badly affected, bacterial exudate from leaf scars, pruning and other wounds, and on older plants prolific development of adventitious roots on the stems in areas where the pith is most badly affected. GEOGRAPHICAL DISTRIBUTION: South Africa, New Zealand (cultures at CMI), Denmark (62, 6), England, Germany (East 60, 5559; West 61, 6591), Italy (S. Sardinia 63, 1960), USA (CA 62, 2155; F 62, 3656; PA 59, 919 on Lucerne). The distribution is probably much more widespread than these records show. TRANSMISSION: The bacterium is probably common in the environment. It has, for example, been isolated from mains water which was being used to irrigate an affected crop. It is probably also spread from plant to plant by man in cultural operations. The disease is favoured by high humidity or wet foliage and high nitrogen levels in the soil; conditions that favour soft plant growth that is most susceptible.

scholarly journals The Transcriptional Activator rfiA Is Quorum-Sensing Regulated by Cotranscription with the luxI Homolog pcoI and Is Essential for Plant Virulence in Pseudomonas corrugata

2009 ◽  
Vol 22 (12) ◽  
pp. 1514-1522 ◽  
Author(s):  
Grazia Licciardello ◽  
Iris Bertani ◽  
Laura Steindler ◽  
Patrizia Bella ◽  
Vittorio Venturi ◽  
...  
Keyword(s):  
Quorum Sensing ◽  
Homoserine Lactone ◽  
Acyl Homoserine Lactone ◽  
Dna Binding Domain ◽  
Pseudomonas Corrugata ◽  
Gram Negative ◽  
Rnd Transporter ◽  
Pith Necrosis ◽  
Rhodotorula Pilimanae

The gram-negative phytopathogen Pseudomonas corrugata has an acyl-homoserine lactone (AHL) quorum-sensing (QS) system called PcoI/PcoR that is involved in virulence on tomato. This work identifies, downstream of pcoI, a gene designated rfiA, which we demonstrate is directly linked to QS by cotranscription with pcoI. The deduced RfiA protein contains a DNA-binding domain characteristic of the LuxR family but lacks the autoinducer-binding terminus characteristic of the QS LuxR-family proteins. We also identified, downstream of rfiA, an operon designated pcoABC, encoding for the three components of a tripartite resistance nodulation-cell-division (RND) transporter system. The expression of pcoABC is regulated by RfiA. We found that lipodepsipeptide (LDP) production is cell density dependent and mutants of pcoI, pcoR, and rfiA are unable to inhibit the growth of the LDP-sensitive microorganisms Rhodotorula pilimanae and Bacillus megaterium. P. corrugata rfiA mutants were significantly reduced in their ability to cause necrosis development in tomato pith. In addition, it was established that PcoR in the absence of AHL also played a role in virulence on tomato. A model for the role of PcoI, PcoR, and RfiA in tomato pith necrosis is presented.

scholarly journals Occurrence of Pseudomonas corrugata causing pith necrosis on tomato plants in Goiás, Brazil

2007 ◽  
Vol 32 (6) ◽  
pp. 520-520 ◽  
Author(s):  
Alice M. Quezado-Duval ◽  
Carielli M.N. Guimarães ◽  
Olinda M. Martins
Keyword(s):  
Pseudomonas Corrugata ◽  
Tomato Plants ◽  
Pith Necrosis

scholarly journals Pseudomonas corrugata Causing Pith Necrosis on Tomato Plants in Baja California Sur, México

Plant Disease ◽  
2002 ◽  
Vol 86 (5) ◽  
pp. 563-563
Author(s):  
G. Rodríguez-Alvarado ◽  
J. Holguín-Peña ◽  
N. Ochoa-Álvarez ◽  
S. P. Fernández-Pavía ◽  
J. A. Geraldo-Verdugo
Keyword(s):  
Baja California ◽  
Tap Water ◽  
Baja California Peninsula ◽  
Bacterial Suspension ◽  
Petroleum Jelly ◽  
Baja California Sur ◽  
Fresh Market ◽  
Pseudomonas Corrugata ◽  
Tomato Plants ◽  
Pith Necrosis

Fresh market tomato (Lycopersicon esculentum Mill.) cultivars are grown in field and greenhouse areas in Baja California Sur from October to June for international markets. During March and April 2001, field-grown tomato plants showing external necrotic stem lesions and hollowed necrotic pith were observed in a 50-ha field 30 km south of La Paz. The average disease incidence in the field was 3%. Most infected plants presented necrotic lesions in the main stem 20 to 30 cm above the soil line. A few plants also presented necrotic lesions in lateral branches. Transversally cut sections in the necrotic stem area showed rotting of the vascular system with hollow cavities, typical symptom of pith necrosis. To isolate the pathogen, 5-cm-long transverse portions of diseased stems were excised, washed with soap and brushed, and rinsed with tap water. The stem portions were soaked in 10% bleach for 2 min, blotted dry on sterile paper, and 1-cm2 sections were cut to include the margins of the necrotic pith. These sections were plated on nutrient agar and incubated at 28 to 30°C. Gram-negative, rod-shaped bacteria were consistently isolated from stems with pith necrosis. They were identified as Pseudomonas corrugata using Biolog analysis (carbon source utilization at 37°C), with a similarity index of 1.0. To confirm pathogenicity, experiments were conducted twice in a screenhouse on a total of 24 2-month-old tomato cv. Rutgers plants (50 to 60 cm tall). Bacteria were injected with a syringe into the stems above the point of lateral branching at two different sites, using 0.25 to 0.5 ml of a bacterial suspension (105 CFU/ml). Injection points were sealed after inoculation with a small amount of petroleum jelly. Necrotic lesions surrounding the point of injection were observed 10 days after inoculation. Four weeks after inoculation, plants showed necrotic pith symptoms similar to those observed on field-grown plants, and P. corrugata was recovered from the margins of areas with necrotic pith. Control plants, which were injected with water, remained healthy throughout the experiments. P. corrugata has been reported to cause pith necrosis in tomato plants in California (3), Florida (2), and the northern part of the Baja California peninsula (1). This report confirms the presence of P. corrugata in the Baja California peninsula, and to our knowledge, this is the first report of P. corrugata causing pith necrosis in tomato plants in the southern state of Baja California Sur, Mexico. References: (1) N. B. Carroll et al. N.C. Agric. Res. Serv. Tech. Bull. No. 300, 1992. (2) J. B. Jones et al. Plant Dis. 67:425, 1983. (3) M. Lai et al. Plant Dis. 67:110, 1983.

Properties of saline-alkaline soil under different land use types in Yellow River Delta

2009 ◽  
Vol 17 (6) ◽  
pp. 1132-1136
Author(s):  
Qing-Mei LI ◽  
Long-Yu HOU ◽  
Yan LIU ◽  
Feng-Yun MA
Keyword(s):  
Land Use ◽  
Yellow River ◽  
Yellow River Delta ◽  
River Delta ◽  
Alkaline Soil ◽  
Land Use Types
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