Pdf spongospora subterranea soil contamination and its. Powdery scab ps, caused by spongospora subterranea, reduces the quality and marketability of potatoes worldwide. Prior studies reported root exudates from host and nonhost plants stimulated resting spore germination of spongospora subterranea, the powdery scab pathogen of potato, but the identities of stimulatory compounds were unknown. Powdery scab on potato tubers is caused by the obligate soilborne biotroph spongospora subterranea and is known to cause substantial losses in. Powdery scab of potato, caused by the obligate biotrophic protozoan pathogen spongospora subterranea f. Some species may be differentiated by the hosts they infect. Zoospore ciliation in the plasmodiophorales nature.
Class project for pp 728, soilborne plant pathogens, fall 2012 introduction. Three field experiments were conducted in naturally infested soil during winter 2008, 2012 and 20 to evaluate the efficacy of soil fumigation on powdery scab on tubers, root galling and the pathogen populations in. Iftikhar et al characterization of spongospora subterranea f sp subterranea root hair and epidermal cells of roots under a stereomicroscope with 20fold magnificatiarn rating of root infection done on 04 scale of marz 1989, vvhsre 0 no sporangia, 1 only a fevv sporangia, several roots with sporangia, 3 sporangia regularly. Global genetics and invasion history of the potato powdery scab pathogen, spongospora subterraneaf. Hoaglands solution hs, a defined nutrient supplement for plants, has been previously reported to stimulate zoospore release from resting spores of the potato pathogen spongospora subterranea f. Information is included on the disease caused by the organism, its transmission, geographical distribution, and hosts. Weeds and rotational crops, such as wheat and barley, were sampled from potato fields with a history of powdery scab ps and examined for the presence of s. Sporogenic cystogenous stages of development of spongospora subterranea wallroth lagerheim f. Occurrence of zoosporangia in spongospora subterranea. Pdf powdery scab, a root and tuber disease caused by the pathogen. Serological detection of spongospora subterranea f. General information about spongospora subterranea sponsu name language. The first signs of infection are seen as small brown spots associated with lenticels or wounds and less frequently with eyes. Understanding of the germination process and factors is, therefore, important.
Original article multiplex realtime pcr taqman assay. During this same year, the disease was found established in potatogrowing states such as maine, florida, minnesota and oregon. Institute of plant protection,gansu academy of agricultural sciences,lanzhou 730070,gansu,china. The resting cyst cytoplasm has a fivelayered envelope separating it from periplasmic space and is contained within a wall consisting of three. Control of potato powdery scab caused by spongospora. Powdery scab of potato, caused by the plasmodiophorid pathogen spongospora subterranea f. Taxonomic serial no 181449 download help spongospora subterranea tsn 181449 taxonomy and nomenclature kingdom. Global population genetics of spongospora subterranea f. The roots were microscopically examined for the presence of plasmodia or zoosporangia 14 days after inoculation. Documents about spongospora subterranea sponsu this website uses cookies our website uses cookies to ensure that we give you the best possible online experience. This study obtained direct empirical evidence for an increase in zoospore release with hs treatment, and identified fe.
Powdery scab of potatoes publications ndsu agriculture. Powdery scab spongospora subterranea of potatoes by melhus, i. Scabby regions on the diseased tuber surface greatly diminish tuber quality and marketability. Resting spores are important for the spread and survival of spongospora subterranea, the causative agent of potato powdery scab and root disease. This study was performed to determine the host range ofspongospora subterranea f. Resting spores may germinate in the presence of plant or environmental stimuli, but direct evidence for resting spore dormancy is limited. Biocontrol of powdery scab of potato by seed tuber. Protection research centre, lincoln university, lincoln, new zealand spongospora subterranea root infection reduces potato plant growth and tuber yields. Pink, in genetic improvement of vegetable crops, 1993. Control of potato powdery scab spongospora subterranea.
Other articles where spongospora subterranea is discussed. Sixteen potato cultivars, with different levels of susceptibility to disease on roots and tubers, were planted in. Egan, department of environmental resource management, national university of ireland, belfield, dublin 4, ireland introduction the plasmodiophorid spongospora subterranea f. Monitoring spongospora subterranea development in potato. Seedlings of the plants were grown in nutrient solutions and inoculated with spore balls ofs. Although powdery scab disease of potatoes has been known and studied for nearly one hundred years, zoosporangia have never been described in. Though this disease can reduce yield somewhat, the true economic effect is due to the unmarketable, scabbed appearance figure 1 as well as rejection of tubers as seed to prevent. Yield loss common scab does not normally affect total yield but often significantly affects tuber appearance, reducing marketable yield. The manner of infection of tubers of the potato solatium tuberosum by spongospora subterranea seems never to have been observed. Spongospora subterranea is a biotrophic pathogen classi. Root exudation has importance in soil chemical ecology influencing rhizosphere microbiota. Knowledge of global genetic diversity and population structure of pathogens is essential for disease management including resistance breeding. Project report epidemiology, autecology and control of spongospora subterranea, cause of potato powdery scab ref. A simple method for detecting spongospora subterranea in soil.
The fine structure of the cystosorus of spongospora. Spongospora subterranea soil contamination and its relationship. However, resting spores must germinate and release zoospores the infective agents to cause infection. Introduction powdery scab of potato is caused by a protozoan pathogen, spongospora subterranea f. Hui nana,li jiping,wang li,ma yongqiang,li jianjun,zhou tianwang,li qingqing. Spongospora subterranea and the two species of polymyxa are vectors for viruses that are pathogenic on a variety of crop plants. General information about spongospora subterranea sponsu eppo global database. Epidemiology and control of spongospora subterranea f. The main diseases of watercress are crookroot, caused by the waterborne fungus spongospora subterranea wallr. It results in lesions scabs on the surface of the tubers which renders them unmarketable. During 19941996 surveys were performed in the netherlands on tubers with symptoms resembling common scab. Presence of spongospora subterranea on swab samples taken in minituber production tunnels before corrective measures were taken. These can eventually rupture within the tuber periderm.
Though this disease can reduce yield somewhat, the true economic effect is due to the unmarketable, scabbed appearance figure 1 as well as rejection of tubers as seed to prevent infestation of. A new distribution map is provided for spongospora subterranea wallr. We do not use these to store personal information about you. Investigating factors affecting infection of potato by spongospora subterranea alison lees, louise sullivan and jennie brierley plant pathology, scri, invergowrie, dundee, dd2 5da, uk conclusions and future work dna of s. Spongospora subterranea an overview sciencedirect topics. Dehne hw, adam g, diekmann m, frahm j, maulermachnik a, halteren p. Hairy nightshade is an alternative host of spongospora. Continuing to use this website means you agree to our use of cookies.
Global genetics and invasion history of the potato powdery. Powdery scab of potatooccurrence, life cycle and epidemiology. Alternative hosts of spongospora subterranea may allow multiplication and survival of the pathogen over time. Powdery scab of potatoincreased knowledge of pathogen. A description is provided for spongospora subterranea f. Resting spore dormancy and infectivity characteristics of. A contribution to the knowledge of spongospora subterranea wallr. The knowledge can potentially have implications for resting spore. Serial section analysis revealed 37 synaptonemal complexes, hence the haploid chromosome number was considered to be 37. Download fulltext pdf download fulltext pdf detection and quantification of spongospora subterranea sporosori in soil by quantitative realtime pcr article pdf available in plant disease 103. Spongospora subterranea is the causal agent of powdery scab on potato.
Spongospora subterranea sponsuoverview eppo global. Inspections are performed on unwashed samples, incidentally supported by microscopic examination. Pp1 efficacy evaluation of plant protection products. Investigating factors affecting infection of potato by. Ultrastructural karyology of spongospora subterranea. This study showed that potato root exudates stimulated s. Biology and chemical ecology of spongospora subterranea. Pdf detection and eradication of spongospora subterranea in. Based on visual inspection, discrimination between common scab streptomyces spp. Symptoms of powdery scab include small lesions in the early stages of the disease, progressing to raised pustules containing a powdery mass. Powdery scab, caused by spongospora subterranea, causes significant economic damage in potato production worldwide due to reduced quality and marketability of seed and ware tubers. Towards biological control of spongospora subterranea f. In recent years there has been an increasing number of reports of the disease, many from new areas. It is caused by the cercozoan spongospora subterranea f.