Effect of total light energy on symptoms and growth of ring rot-infected Red Pontiac potato plants

1983 ◽  
Vol 60 (6) ◽  
pp. 461-468 ◽  
Author(s):  
G. A. Nelson ◽  
G. C. Kozub
Keyword(s):  
Light Energy ◽  
Potato Plants ◽  
Ring Rot ◽  
Total Light ◽  
Red Pontiac

Selenium Nanocomposites Having Polysaccharid Matrices Stimulate Growth of Potato Plants in Vitro Infected with Ring Rot Pathogen

2019 ◽  
Vol 489 (1) ◽  
pp. 184-188 ◽  
Author(s):  
A. I. Perfileva ◽  
O. A. Nozhkina ◽  
I. A. Graskova ◽  
A. V. Dyakova ◽  
A. G. Pavlova ◽  
...  
Keyword(s):  
Potato Plants ◽  
Ring Rot ◽  
Potato Plants In Vitro

ENDOPHYTIC BACTERIAL FLORA IN SOLANUM TUBEROSUM AND ITS SIGNIFICANCE IN BACTERIAL RING ROT DIAGNOSIS

1974 ◽  
Vol 54 (1) ◽  
pp. 115-122 ◽  
Author(s):  
S. H. DE BOER ◽  
R. J. COPEMAN
Keyword(s):  
Solanum Tuberosum ◽  
Bacterial Population ◽  
Bacterial Flora ◽  
Stem Tissue ◽  
Bacterial Ring Rot ◽  
Bacterial Populations ◽  
Corynebacterium Sepedonicum ◽  
Potato Plants ◽  
Ring Rot ◽  
Significant Difference

The aerobic endophytic bacterial population in "healthy" potato plants was found to vary from fewer than 1 × 103 to 4.2 × 107 cells/cm3 of stem tissue and from 0 to 1.6 × 104 cells/cm3 in tubers. No significant correlation was found between the bacterial population in stems and tubers of the same plant, nor was there a significant difference in the bacterial populations of virus-free plants when compared with PVX-infected plants. Strains of Micrococcus, Pseudomonas, Bacillus, Flavobacterium, Xanthomonas, Agrobacterium, and coryneforms were isolated in addition to several isolates that could not be identified. All isolates were nonpathogenic, including the coryneforms, some of which were morphologically indistinguishable from Corynebacterium sepedonicum but which were biochemically different.

scholarly journals Effect of Selenium-Arabinogalactan Nanocomposite on the Colonization of Potato Plants in vitro by the Ring Rot Pathogen

2020 ◽  
Vol 32 ◽  
pp. 3-17
Author(s):  
A. I. Perfileva ◽  
◽  
O. A. Nozhkina ◽  
I. A. Graskova ◽  
N. S. Zabanova ◽  
...  
Keyword(s):  
Shoot Apex ◽  
Plant Tissues ◽  
Similar Data ◽  
Potato Root ◽  
Potato Plants ◽  
Ring Rot ◽  
Negative Effect ◽  
Pathogen Colonization ◽  
Root Tissues

It has been previously shown that the chemically synthesized nanocomposite of selenium with arabinogalactan (NC Se/AG) is characterized by antibacterial effect upon the agent of ring rot – gram-positive bacterium Clavibacter sepedonicus (Cms), with the NC Se/AG having no negative effect on potato plants. In the present paper, it has been found that, 1 hour after the treatment of the NC Se/AG, a substantial elevation of lipid peroxidation products was observed in potato root tissues. This supports earlier results on the increase in reactive oxygen species (ROS) production in potato root tissues under the influence of NC Se/AG. It is proposed that the increased ROS content in potato may inhibit pathogen colonization of plants. This has been tested by seeding homogenised plant tissues of various potato zones (roots, stems, shoot apex zone) onto the nutrient medium. In plants infected with Cms and untreated with the NC, the number of colony forming units (CFUs) of Cms has been shown to be numerous both in potato culture medium and in root and stem tissues. In shoot apex zone of such plants, it has been revealed, bacteria also present, but in smaller quantities. Similar data have been obtained by seeding homogenised tissues from roots and stems of potato plants treated with the NC followed by infection with Cms. However, seeding from shoot apex zones of the plants has been given 4 times less CFUs than from potato plants not treated with the NC. The effect of the NC Se/AG upon the pathogen colonization of plants appears to depend on the titre of the microorganism. In shoot apex zone of plants, characterized with small number of CFUs of Cms, the pathogen growth has been decreased. For the first time, Cms bacteria in potato plant tissues in vitro have been visualized with the aid of scanning microscopy.

scholarly journals Bulk Fill Resin Composite Materials Cured with Single-Peak versus Dual-Peak LED LCUs

2016 ◽  
Vol 62 (1) ◽  
pp. 5-14 ◽  
Author(s):  
Mohammed Aldossary ◽  
Elizabeth M. Roebuck ◽  
Ario Santini
Keyword(s):  
Total Energy ◽  
Resin Composite ◽  
Light Energy ◽  
Single Peak ◽  
Bottom Surface ◽  
Energy Transmission ◽  
Significant Difference ◽  
Total Light ◽  
Peak Versus ◽  
Fill Materials

AbstractIntroduction: Manufactures claim that recently introduced bulk fill materials (BFM) can be cured adequately in 4 mm increments. This requires adequate light energy to be transmitted through the material to ensure adequate polymerization at the bottom of the increment. Aim: To compare the total light energy transmission through three BFMs and bottom/top (B/T) surface Vickers hardness (VH) when cured with single-peak versus dual-peak LED LCUs.Methods and Materials: Samples (n=5) of two viscous BFMs, Tetric EvoCeram® Bulk Fill X-tra fil® [XF] flowable SureFil, were prepared. A conventional RBC, Tetric EvoCeram® was used as a control. Using MARC® RC, the irradiance delivered to top surface of samples was adjusted to 1200 mW/cm2. Samples were cured with singlepeak EliparTM S10 or dual-peakBluephase® G2 for 10 seconds and irradiance transmitted to the bottom surface measured. Samples were stored for 24 hours, prior to VH measurements B/T VH ratios were calculated. Statistically analysed used oneway ANOVA (α=0.05).Results: There was no statistically significant difference for B/T total energy transmission between materials except XF with EliparTM S10 (P<0.001). Total energy transmission ranged from 0.7 J/cm2 to 1.5 J/cm2. There was no statistically significant difference for B/T VH ratios between materials (P>0.05) when materials were cured with single-peak versus dual-peak LCU’s, XF>SDR>TEC>TBF. TBF alone, did not reach the generally accepted B/T VH of 80%. Conclusions: Both single-peak and dual-peak LCU’s were equally effective for curing the studied bulk fill materials. Manufacture’s recommended total energy delivered to the top surface may not always be sufficient for effective curing.

scholarly journals The effect of metal-containing biocomposites of fungal origin on potato plants in vitro

2020 ◽  
Vol 10 (3) ◽  
pp. 412-423
Author(s):  
O. M. Tsivileva ◽  
A. I. Perfileva ◽  
A. G. Pavlova
Keyword(s):  
Biofilm Formation ◽  
Morphometric Parameters ◽  
Potato Plants ◽  
Physiological Processes ◽  
Ring Rot ◽  
Extracellular Metabolites ◽  
Phytotoxic Effect ◽  
Number Of Leaves ◽  
Potato Resistance

The effect of metal (II)-containing composites based on extracellular metabolites of basidiomycetes Pleurotus ostreatus, Ganoderma lucidum, Grifola umbellata and Laetiporus sulphureus on the viability and response of potato plants in vitro has been investigated. The Lukyanovsky variety of potato, which is susceptible to ring rot, caused by the bacterium Clavibacter sepedonicus, was studied. The parameters investigated included biofilm formation by Clavibacter sepedonicus, various morphometric parameters of plants and the phytotoxicity of substances of fungal origin. The greatest anti-biofilm-forming effect was observed in metal-containing biocomposites based on G. lucidum; Fe- and Co-containing biopreparations inhibited the formation of Clavibacter sepedonicus biofilms by 40–50%. The plant height was adversely affected by composites, in the absence of metal (II), derived from L. sulphureus and P. ostreatus, as well as by a Co-containing composite derived from P. ostreatus. The decrease in plant growth, in comparison with the control, can be associated with the pronounced antibiotic properties of these basidiomycetes and cobalt. The remaining biocomposites studied did not have an adverse effect on the growth of potatoes in vitro. A number of morphometric parameters (length of internodes, number of leaves) remained virtually unchanged when exposed to biocomposites of fungal origin. In contrast to the vegetative part of plants, the biomass and length of the roots increased by 10–20% under the influence of biocomposites. Copper-containing composites derived from G. lucidum had no phytotoxic effect on plants and enhanced potato resistance to Clavibacter sepedonicus. The beneficial properties of biocomosites may be judged by the degree of stimulation of the physiological processes underlying the formation of the underground part of the plants, which is a prerequisite for increasing yields. The biocomposites are environmentally friendly because of their natural origin and being effective at very low doses. The results obtained using metal-containing biocomposites derived from G. lucidum and Gr. umbellata demonstrate the safety and possible improvement in health of potato plants by using biocomposites derived from cultures of higher fungi.

scholarly journals Expression of PR genes and genes of heat shock proteins of potato plants in vitro under infection with ring rot and heat stress

2018 ◽  
Vol 34 (1) ◽  
pp. 3-13
Author(s):  
V. N. Nurminsky ◽  
A. S. Stolbikov ◽  
A. V. Pomortsev ◽  
A. I. Perfileva
Keyword(s):  
Heat Stress ◽  
Heat Shock ◽  
Heat Shock Proteins ◽  
Pr Genes ◽  
Potato Plants ◽  
Ring Rot ◽  
Shock Proteins ◽  
Potato Plants In Vitro

scholarly journals Conventional and High Intensity Halogen Light Effects on Water Sorption and Microhardness of Orthodontic Adhesives

2008 ◽  
Vol 78 (1) ◽  
pp. 134-139 ◽  
Author(s):  
Tancan Uysal ◽  
Faruk Ayhan Basciftci ◽  
Yagmur Sener ◽  
Murat Selim Botsali ◽  
Abdullah Demir
Keyword(s):  
Light Source ◽  
High Intensity ◽  
Water Sorption ◽  
Null Hypothesis ◽  
Light Energy ◽  
Light Sources ◽  
Orthodontic Adhesives ◽  
Quartz Tungsten Halogen ◽  
Halogen Light ◽  
Total Light

Abstract Objective: To test the null hypothesis that when the equivalent total light energy is irradiated to three orthodontic adhesive resins, there is no difference between the microhardness and water sorption values regardless of the curing light sources. Materials and Methods: Samples were divided into six groups according to the combination of three orthodontic adhesives (Kurasper F, Light-Bond, Transbond XT) and two light intensities (quartz tungsten halogen [QTH] and high intensity quartz tungsten halogen [HQTH]). One half of each of the 40 samples of three adhesive pastes was polymerized for 20 seconds by a QTH light source, and the other half was polymerized for 10 seconds by a HQTH light source. Water sorption was determined and Vickers hardness was established with three measurements per sample at the top, center, and bottom. Statistical analysis was performed using two-way analysis of variance (ANOVA) with multiple comparisons (Tukey-HSD). Results: Statistically significant differences were found among all adhesives for water sorption and hardness values cured with QTH and HQTH. The HQTH curing unit resulted in higher values than did the QTH. The highest water sorption values were observed for Kurasper F cured with HQTH and the lowest value was observed for Transbond XT cured with QTH. For microhardness Light-Bond cured with HQTH produced the highest values, and Transbond XT cured with QTH produced the lowest. Conclusions: When the equivalent total light energy is irradiated to three orthodontic adhesive resins, there are significant differences between the microhardness and water sorption values cured with the QTH and HQTH light source. The null hypothesis is rejected.

THE OCCURRENCE IN THE HOST PLANT OF PHYSIOLOGICALLY ACTIVE GUMS PRODUCED BY CORYNEBACTERIUM INSIDIOSUM AND CORYNEBACTERIUM SEPEDONICUM

1961 ◽  
Vol 7 (2) ◽  
pp. 185-188 ◽  
Author(s):  
J. F. T. Spencer ◽  
P. A. J. Gorin
Keyword(s):  
Host Plant ◽  
Bacterial Wilt ◽  
Land Plants ◽  
Corynebacterium Sepedonicum ◽  
Potato Plants ◽  
Ring Rot ◽  
Causative Agents ◽  
Potato Ring Rot

Corynebacterium insidiosum and Corynebacterium sepedonicum, the causative agents of bacterial wilt of alfalfa and of potato ring rot, produce viscous polysaccharide solutions when grown in shaken culture. These substances contain fucose, a sugar rarely found in polysaccharides of land plants. Hydrolyzates of polysaccharides extracted from alfalfa and potato plants infected with these organisms also contained fucose, while extracts of healthy plants did not. Alfalfa cuttings placed in dilute polysaccharide solutions wilted rapidly. These findings suggest that these polysaccharides are probably formed in the vascular systems of infected plants and that if such is the case they contribute to the development of the disease in these plants.

The Biological Activity of a Selenium Nanocomposite Encapsulated in Carrageenan Macromolecules with Respect to Ring Rot Pathogenesis of Potato Plants

2019 ◽  
Vol 14 (5-6) ◽  
pp. 255-262
Author(s):  
O. A. Nozhkina ◽  
A. I. Perfileva ◽  
I. A. Graskova ◽  
A. V. Dyakova ◽  
V. N. Nurminsky ◽  
...  
Keyword(s):  
Biological Activity ◽  
Potato Plants ◽  
Ring Rot
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