Enkele opmerkingen over Poederschurft Spongospora subterranea Wallr.

1946 ◽  
Vol 52 (1) ◽  
pp. 18-22
Author(s):  
J. Mol ◽  
H. A. Ormel
Keyword(s):  
Spongospora Subterranea

Effects of irrigation regimes on powdery scab disease and yield of potatoes

1986 ◽  
Vol 26 (6) ◽  
pp. 745 ◽  
Author(s):  
PA Taylor ◽  
SP Flett ◽  
RFde Boer ◽  
D Marshall
Keyword(s):  
Large Scale ◽  
Field Experiments ◽  
Field Trials ◽  
Powdery Scab ◽  
Infested Soil ◽  
Spongospora Subterranea ◽  
Potato Tubers ◽  
Potato Plants ◽  
Tuber Set ◽  
Large Scale Field

The period of susceptibility of potato tubers to powdery scab (Spongospora subterranea) was studied by inoculating potato plants with spores, or by watering plants in infested soil, at different stages of plant development in greenhouse conditions. Maximum susceptibility began about 1 week before the stage when 50% of stolons had swollen to at least 5-mm diameter (tuber set), and ended 3-4 weeks later. With holding irrigation water during this period reduced the severity of powdery scab by 65-75% in field experiments in 1981-82 and 1982-83, but had no apparent effect on disease severity in 3 out of 6 large-scale field trials during 1984-85.

GALLS ON POTATO SPROUTS CAUSED BY SPONGOSPORA SUBTERRANEA

1954 ◽  
Vol 3 (4) ◽  
pp. 123-124 ◽  
Author(s):  
R. K. McKee ◽  
T. Webster
Keyword(s):  
Spongospora Subterranea

Ultrastructural karyology of Spongospora subterranea (Plasmodiophoromycetes)

1992 ◽  
Vol 70 (6) ◽  
pp. 1228-1233 ◽  
Author(s):  
James P. Braselton
Keyword(s):  
Electron Microscopy ◽  
Single Unit ◽  
Spongospora Subterranea ◽  
Unit Membrane ◽  
Potato Tubers ◽  
Haploid Chromosome Number ◽  
Synaptonemal Complexes ◽  
Transmission Electron ◽  
Host Parasite ◽  
Section Analysis

Sporogenic (cystogenous) stages of development of Spongospora subterranea (Wallroth) Lagerheim f.sp. subterranea Tomlinson infecting potato tubers were examined with transmission electron microscopy. Volume of nuclei in transitional Plasmodia was 28.2 ± 8.3 μm3. Serial section analysis revealed 37 synaptonemal complexes, hence the haploid chromosome number was considered to be 37. Total length of synaptonemal complexes per nucleus was 74.6 ± 1.4 μm, with individual synaptonemal complexes ranging in length from 1.34 ± 0.07 μm to 3.48 ± 0.17 μm. No polycomplexes were observed in transitional nuclei. Electron-opaque thickenings of lateral elements occurred irregularly. Additional ultrastructural features of sporogenic plasmodia included end-to-end paired centrioles defining the poles of the nuclei and a host–parasite boundary of a single unit membrane. Key words: karyotype, Plasmodiophoromycetes, Spongospora, synaptonemal complex.

scholarly journals Analysis of Carbohydrate Metabolism Genes of Spongospora subterranea Using 454 Pyrosequencing

2014 ◽  
Vol 67 (2) ◽  
pp. 7247-7260 ◽  
Author(s):  
Pablo Andrés Gutiérrez Sánchez ◽  
Juan Fernando Alzate ◽  
Mauricio Marín Montoya
Keyword(s):  
Dna Sequences ◽  
454 Pyrosequencing ◽  
Plant Pathogens ◽  
Plasmodiophora Brassicae ◽  
Bioinformatic Analysis ◽  
Spongospora Subterranea ◽  
Sequencing Technologies ◽  
Intron Structure ◽  
Basic Biology

Spongospora subterranea, the causal agent of Potato powdery scab, is an important soil-borne obligate protozoan commonly found in Andean soils. This is a serious problem that causes cosmetic damage on the skin of tubers and induces root gall formation, diminishing the yield and commercial value of the potato. Genetic studies on S. subterranea are difficult due to its obligate parasitism, which explains the lack of available knowledge on its basic biology. S. subterranea is a member of the Plasmodiophorida order, a protist taxa that includes other important plant pathogens such as Plasmodiophora brassicae and Spongospora nasturtii. Little is known about the genomes of Plasmodiophorida; however, with the use of Next-Generation Sequencing technologies combined with appropriate bioinformatic techniques, it is possible to obtain genomic sequences from obligate pathogens such as S. subterranea. To gain a better understanding of the biology of this pathogen and Plasmodiophorida in general, DNA sequences from a cystosori-enriched sample of S. subterranea were obtained using 454 pyrosequencing technology. As a first step in understanding the nutritional requirements of S. subterranea as well as its infective and resistance structures, we present a bioinformatic analysis of 24 contigs related to genes involved in the glycolysis, starch, celullose and chitin metabolism. Intron structure and codon usage is also discussed. The genes analyzed in this study are a good source of information for studies aimed at characterizing these enzymes in vitro, as well as the generation of new methods for the molecular detection of S. subterranea in either soils or infected plants.

scholarly journals Maria Huanca, nueva variedad de papa resistente al nematodo de quiste de la papa (Globodera pallida)

2016 ◽  
Vol 2 (1) ◽  
pp. 77-89 ◽  
Author(s):  
Jorge A. Llontop ◽  
María M. Scurrah ◽  
Javier Franco
Keyword(s):  
Rhizoctonia Solani ◽  
Phytophthora Infestans ◽  
Globodera Pallida ◽  
Spongospora Subterranea ◽  
Erysiphe Cichoracearum

Desde 1980 el Centro Internacional de la Papa (CIP) ha estado enviando clones de papa a varios investigadores del Programa Nacional de Papa del Perú adscrito al Instituto Nacional de Investigación Agraria y Agroindustrial (INIAA), para evaluar su comportamiento y resistencia al nemátodo quiste de la papa con el objeto de seleccionar variedades resistentes. En 1983, el CIPA IV del INIAA, en La Libertad (Sierra Norte del Perú), seleccionó un clon sobresaliente, identificado como 279142.12 ó G3. Después de varias pruebas, el clon fue liberado en 1987 con el nombre de María Huanca, y es la primera variedad resistente a las razas P4A y P5A de G. pallida en el Perú y Latinoamérica. Esta variedad proviene de un cruce entre S. tuberosum subsp. andigena y un híbrido de 5. tuberosum subsp. tuberosum x S. vernei. Los tubérculos son oblongos, de piel rojiza, la pulpa es blanca, ocasionalmente con estrías moradas. La planta es erecta y alcanza una altura de 80 cm con pequeños folíolos de color verde oscuro; tiene el fenotipo de andigena. Los rendimientos de las Estaciones Experimentales variaron entre 30 y 60 t/ha y en campos de agricultores de 20 a 30 t/ha. Además de su resistencia al nemátodo del quiste de la papa, esta variedad es también resistente a las razas 1 y 2 de la verruga (Synchitrium endobioticum), inmune a PVY e hipersensitiva a la raza común de PVY. Es tolerante a rancha (Phytophthora infestans) y al carbón de la papa (Tecaphora solani); susceptible a roña (Spongospora subterranea),rizoctoniasis (Rhizoctonia solani), oidium (Erysiphe cichoracearum) y a mancha foliar (Phoma andigena).

Control of potato powdery scab (Spongospora subterranea) in Israel with chloropicrin, metam sodium or fluazinam

2019 ◽  
Vol 124 ◽  
pp. 104836 ◽  
Author(s):  
L. Tsror (Lahkim) ◽  
O. Erlich ◽  
M. Hazanovsky ◽  
S. Lebiush
Keyword(s):  
Powdery Scab ◽  
Spongospora Subterranea ◽  
Metam Sodium
Sign in / Sign up

Export Citation Format

Share Document