Abstract:
:The most economically important plant pathogens in the genus Pseudoperonospora (family Peronosporaceae) are Pseudoperonospora cubensis and P. humuli, causal agents of downy mildew on cucurbits and hop, respectively. Recently, P. humuli was reduced to a taxonomic synonym of P. cubensis based on internal transcribed spacer (ITS) sequence data and morphological characteristics. Nomenclature has many practical implications for pathogen identification and regulatory considerations; therefore, further clarification of the genetic and pathogenic relatedness of these organisms is needed. Phylogenetic analyses were conducted considering two nuclear and three mitochondrial loci for 21 isolates of P. cubensis and 14 isolates of P. humuli, and all published ITS sequences of the pathogens in GenBank. There was a consistent separation of the majority of the P. humuli isolates and the P. cubensis isolates in nuclear, mitochondrial, and ITS phylogenetic analyses, with the exception of isolates of P. humuli from Humulus japonicus from Korea. The P. cubensis isolates appeared to contain the P. humuli cluster, which may indicate that P. humuli descended from P. cubensis. Host-specificity experiments were conducted with two reportedly universally susceptible hosts of P. cubensis and two hop cultivars highly susceptible to P. humuli. P. cubensis consistently infected the hop cultivars at very low rates, and sporangiophores invariably emerged from necrotic or chlorotic hypersensitive-like lesions. Only a single sporangiophore of P. humuli was observed on a cucurbit plant during the course of the studies. Together, molecular data and host specificity indicate that there are biologically relevant characteristics that differentiate P. cubensis and P. humuli that may be obfuscated if P. humuli were reduced to a taxonomic synonym of P. cubensis. Thus, we recommend retaining the two species names P. cubensis and P. humuli until the species boundaries can be resolved unambiguously.
journal_name
Phytopathologyjournal_title
Phytopathologyauthors
Mitchell MN,Ocamb CM,Grünwald NJ,Mancino LE,Gent DHdoi
10.1094/PHYTO-10-10-0270subject
Has Abstractpub_date
2011-07-01 00:00:00pages
805-18issue
7eissn
0031-949Xissn
1943-7684journal_volume
101pub_type
杂志文章相关文献
PHYTOPATHOLOGY文献大全abstract::The online community resource Phytophthora database (PD) was developed to support accurate and rapid identification of Phytophthora and to help characterize and catalog the diversity and evolutionary relationships within the genus. Since its release in 2008, the sequence database has grown to cover 1 to 12 loci for ≈2...
journal_title:Phytopathology
pub_type: 信件
doi:10.1094/PHYTO-01-13-0023-R
更新日期:2013-12-01 00:00:00
abstract::ABSTRACT Magnaporthe grisea, the causal agent of rice blast, forms a dome-shaped melanized infection structure, an appressorium, to infect its host. Environmental cues that induce appressorium formation in this fungus include the hydrophobicity and hardness of the contact surface and chemicals produced by the host. An...
journal_title:Phytopathology
pub_type: 杂志文章
doi:10.1094/PHYTO.1998.88.1.58
更新日期:1998-01-01 00:00:00
abstract::ABSTRACT Diseases of cacao, Theobroma cacao, account for losses of more than 30% of the potential crop. These losses have caused a steady decline in production and a reduction in bean quality in almost all the cacao-producing areas in the world, especially in small-holder farms in Latin America and West Africa. The mo...
journal_title:Phytopathology
pub_type: 杂志文章
doi:10.1094/PHYTO-97-12-1658
更新日期:2007-12-01 00:00:00
abstract::Previous research has shown that Botrytis cinerea isolates with resistance to multiple chemical classes of fungicides exist in eastern strawberry fields. In this study, the fungicide resistance profiles of 2,130 isolates from flowers of commercial strawberry fields located in multiple states was determined over four c...
journal_title:Phytopathology
pub_type: 杂志文章
doi:10.1094/PHYTO-04-16-0161-R
更新日期:2016-12-01 00:00:00
abstract::ABSTRACT Natural potato late blight epidemics were studied to assess the relative impact of various inoculum sources of Phytophthora infestans in Southern Flevoland (the Netherlands) from 1994 through 1996. Disease surveys were combined with characterization of isolates for mating type and DNA fingerprint pattern usin...
journal_title:Phytopathology
pub_type: 杂志文章
doi:10.1094/PHYTO.1998.88.8.754
更新日期:1998-08-01 00:00:00
abstract::Tamarillo, or tree tomato (Solanum betaceum), is a perennial small tree or shrub species cultivated in subtropical areas for fresh fruit and juice production. In Ecuador, tamarillo orchards are affected by several viruses, with one previously identified as potato virus Y (PVY); however, the specific strain composition...
journal_title:Phytopathology
pub_type: 杂志文章
doi:10.1094/PHYTO-04-20-0111-R
更新日期:2020-09-01 00:00:00
abstract::The analysis of the spatial distribution of plant diseases requires the availability of trustworthy geostatistical methods. The mean distance tests (MDT) are here proposed as a series of permutation and randomization tests to assess the spatial distribution of plant diseases when the variable of phytopathological inte...
journal_title:Phytopathology
pub_type: 杂志文章
doi:10.1094/PHYTO-05-15-0112-R
更新日期:2016-01-01 00:00:00
abstract::Previous works indicated a considerable variation in the pathogenicity, virulence, and host range of Oidium neolycopersici isolates causing tomato powdery mildew epidemics in many parts of the world. In this study, rDNA internal transcribed spacer (ITS) sequences, and amplified fragment length polymorphism (AFLP) patt...
journal_title:Phytopathology
pub_type: 杂志文章
doi:10.1094/PHYTO-98-5-0529
更新日期:2008-05-01 00:00:00
abstract::ABSTRACT Xanthomonas axonopodis pv. glycines is the causal agent of bacterial pustule disease of soybeans. A transposon insertional mutant (KU-P-M670) of X. axonopodis pv. glycines derived from wild-type strain KU-P-34017 lost the ability to induce the hypersensitive response (HR) on tobacco and pepper but retained it...
journal_title:Phytopathology
pub_type: 杂志文章
doi:10.1094/PHYTO-96-1230
更新日期:2006-11-01 00:00:00
abstract::ABSTRACT A genetic map including three avirulence (Avr) genes, AvrPik, AvrPiz, and AvrPiz-t, was constructed in a genetic cross of two rice field isolates, 84R-62B and Y93-245c-2. The chromosomal locations of the Avr genes were determined by using selected markers to probe Southern blots of the parental chromosomes th...
journal_title:Phytopathology
pub_type: 杂志文章
doi:10.1094/PHYTO-95-0640
更新日期:2005-06-01 00:00:00
abstract::Phytophthora species are destructive fungus-like plant pathogens that use asexual single-celled flagellate zoospores for dispersal and plant infection. Many of the zoospore behaviors are density-dependent although the underlying mechanisms are poorly understood. Here, we use P. nicotianae as a model and demonstrate au...
journal_title:Phytopathology
pub_type: 杂志文章
doi:10.1094/PHYTO-100-7-0632
更新日期:2010-07-01 00:00:00
abstract::Cercospora sojina causes frogeye leaf spot of soybean, which can cause serious economic losses in the United States. In this study, 132 C. sojina isolates were collected from six fields (from two counties, Cross and Crawford) in Arkansas. To determine mating type, a multiplex polymerase chain reaction assay was develo...
journal_title:Phytopathology
pub_type: 杂志文章
doi:10.1094/PHYTO-09-12-0229-R
更新日期:2013-10-01 00:00:00
abstract::Tobacco mosaic virus (TMV) is an extensively studied RNA virus known to infect tobacco (Nicotiana tabacum) and other solanaceous crops. TMV has been classified as a seedborne virus in tobacco, with infection of developing seedlings thought to occur from contact with the TMV-infected seed coat. The mechanism of TMV tra...
journal_title:Phytopathology
pub_type: 杂志文章
doi:10.1094/PHYTO-06-19-0201-FI
更新日期:2020-01-01 00:00:00
abstract::Resistance genes are a major tool for managing crop diseases. The networks of crop breeders who exchange resistance genes and deploy them in varieties help to determine the global landscape of resistance and epidemics, an important system for maintaining food security. These networks function as a complex adaptive sys...
journal_title:Phytopathology
pub_type: 杂志文章
doi:10.1094/PHYTO-03-17-0082-FI
更新日期:2017-10-01 00:00:00
abstract::Resin obtained from Pinus radiata and five monoterpene components of resin (limonene, α-pinene, β-pinene, camphene, and myrcene) were tested to determine their effects on mycelial growth and germination and survival of spores of Fusarium circinatum, the cause of pitch canker in pine, and F. temperatum, which is interf...
journal_title:Phytopathology
pub_type: 杂志文章
doi:10.1094/PHYTO-02-14-0027-R
更新日期:2015-01-01 00:00:00
abstract::ABSTRACT Sphaeropsis sapinea is the causal agent of Sphaeropsis tip blight disease of pines. Past surveys of diseased and symptomless Austrian and Scots pines revealed that latent infections of symptomless shoots by S. sapinea are common. The role of these latent infections in the tip blight disease is unknown. A samp...
journal_title:Phytopathology
pub_type: 杂志文章
doi:10.1094/PHYTO.2003.93.12.1471
更新日期:2003-12-01 00:00:00
abstract::Soybean rust, caused by the fungus Phakopsora pachyrhizi, is an economically important disease of soybean with potential to cause severe epidemics resulting in significant yield losses. Host resistance is one of the management tools to control this disease. This study compared soybean genotypes exhibiting immunity, co...
journal_title:Phytopathology
pub_type: 杂志文章
doi:10.1094/PHYTO-12-12-0334-R
更新日期:2014-01-01 00:00:00
abstract::Stem nematode (Ditylenchus destructor) is one of most serious diseases that limit the productivity and quality of sweet potato (Ipomoea batatas), a root crop with worldwide importance for food security and nutrition improvement. Hence, there is a global demand for developing sweet potato varieties that are resistant t...
journal_title:Phytopathology
pub_type: 杂志文章
doi:10.1094/PHYTO-04-15-0087-R
更新日期:2015-11-01 00:00:00
abstract::ABSTRACT Epicuticular wax on needles was evaluated for its influence on Cronartium ribicola infection of resistant and susceptible selections of Pinus strobus. Environmental scanning electron microscopy comparisons revealed that needles from a resistant selection of eastern white pine, P327, had a significantly higher...
journal_title:Phytopathology
pub_type: 杂志文章
doi:10.1094/PHYTO-96-0171
更新日期:2006-02-01 00:00:00
abstract::ABSTRACT The ability of Thielaviopsis basicola to survive saprophytically in soil was investigated using root tissue from susceptible hosts as organic substrates. Inoculum densities were lower in soils amended with root tissue than in nonamended controls after 2 and 4 weeks of incubation. The greatest decrease occurre...
journal_title:Phytopathology
pub_type: 杂志文章
doi:10.1094/PHYTO.1997.87.12.1214
更新日期:1997-12-01 00:00:00
abstract::ABSTRACT Citrus Huanglongbing (HLB) is one of the most devastating diseases of citrus worldwide. The causal agent of HLB in Florida is thought to be 'Candidatus Liberibacter asiaticus'. In this work, we examined the responses of 30 different genotypes of citrus to Florida isolates of 'Ca. L. asiaticus' under controlle...
journal_title:Phytopathology
pub_type: 杂志文章
doi:10.1094/PHYTO-99-12-1346
更新日期:2009-12-01 00:00:00
abstract::Avirulence (AVR) genes in Magnaporthe oryzae, the fungal pathogen that causes the devastating rice blast disease, have been documented to be major targets subject to mutations to avoid recognition by resistance (R) genes. In this study, an AVR-gene-based diagnosis tool for determining the virulence spectrum of a rice ...
journal_title:Phytopathology
pub_type: 杂志文章
doi:10.1094/PHYTO-12-16-0451-R
更新日期:2017-06-01 00:00:00
abstract::In this study, we investigated whether fungicide-induced mutagenesis previously reported in Monilinia fructicola could accelerate genetic changes in field populations. Azoxystrobin and propiconazole were applied to nectarine trees at weekly intervals for approximately 3 months between bloom and harvest in both 2013 an...
journal_title:Phytopathology
pub_type: 杂志文章
doi:10.1094/PHYTO-03-16-0127-R
更新日期:2016-12-01 00:00:00
abstract::ABSTRACT It has been speculated that the N-terminal half of the readthrough domain (RTD) encoded by open reading frame 5 of Soybean dwarf virus (SbDV) is related to the vector specificity. To further investigate this hypothesis, transmissibility via aphids was tested on 17 SbDV isolates and comparisons of the deduced ...
journal_title:Phytopathology
pub_type: 杂志文章
doi:10.1094/PHYTO.2003.93.12.1560
更新日期:2003-12-01 00:00:00
abstract::To assess the diversity of Xanthomonas campestris spp. infecting crucifers in New York, 154 isolates were collected over 10 years across the state. The goal was to determine if isolates of the pathogen were overwintering in New York and serving as primary inoculum in subsequent years, or if novel isolates were enterin...
journal_title:Phytopathology
pub_type: 杂志文章
doi:10.1094/PHYTO-06-15-0134-R
更新日期:2016-02-01 00:00:00
abstract::Few molecular details of effectors of Heterodera avenae parasitism are known. We performed a high-throughput sequencing analysis of the H. avenae transcriptome at five developmental stages. A total of 82,549 unigenes were ultimately obtained, and 747 transcripts showed best hits to genes putatively encoding carbohydra...
journal_title:Phytopathology
pub_type: 杂志文章
doi:10.1094/PHYTO-07-17-0226-R
更新日期:2018-02-01 00:00:00
abstract::Developing oat cultivars with partial resistance to crown rust would be beneficial and cost-effective for disease management. Two recombinant inbred-line populations were generated by crossing the susceptible cultivar Provena with two partially resistant sources, CDC Boyer and breeding line 94197A1-9-2-2-2-5. A third ...
journal_title:Phytopathology
pub_type: 杂志文章
doi:10.1094/PHYTO-04-14-0114-R
更新日期:2015-02-01 00:00:00
abstract::The increase in the incidence of gastroenteritis outbreaks linked to the consumption of foods of plant origin has ignited public concern and scientific interest in understanding interactions of human enteric pathogens with plants. Enteric disease caused by nontyphoidal Salmonella is a major public health burden, with ...
journal_title:Phytopathology
pub_type: 杂志文章,评审
doi:10.1094/PHYTO-11-12-0295-RVW
更新日期:2013-04-01 00:00:00
abstract::ABSTRACT Two biocontrol agents, a yeast (Pichia guilermondii) and a bacterium (Bacillus mycoides), were tested separately and together for suppression of Botrytis cinerea on strawberry leaves. The aims of the research were to determine whether the use of their combination would broaden the environmental conditions und...
journal_title:Phytopathology
pub_type: 杂志文章
doi:10.1094/PHYTO.2001.91.7.621
更新日期:2001-07-01 00:00:00
abstract::Citrus Huanglongbing (HLB) is the most severe disease of citrus plants caused by 'Candidatus Liberibacter asiaticus' and transmitted by the insect vector Asian citrus psyllid (ACP). No effective curative measure is available against HLB. For citrus production areas without HLB or with low HLB disease incidence, remova...
journal_title:Phytopathology
pub_type: 杂志文章
doi:10.1094/PHYTO-11-18-0432-R
更新日期:2019-06-01 00:00:00