Abstract:
:ABSTRACT The influence exerted by Pythium group F (a minor pathogen ubiquitous in soilless cultures) and P. uncinulatum (a nonpathogenic species) colonization on tomato roots was investigated. In both interactions, infected roots did not exhibit obvious symptoms; however, major physiological changes occurred within the host tissues colonized by Pythium group F compared to P. uncinulatum. According to our cytological observations, Pythium group F colonization involved a series of events: first, development and growth of the fungus in the epidermis and outer cortex tissues, which was associated with marked host cell disorganization and even breakdown. In colonized roots, symptoms were not easily discernible because alterations were restricted to the epidermis and outer cortex tissues. Second, pathogen ingress in the inner cortex and stele tissues was associated with massive induction of host defense reactions and alteration of invading hyphae. In a complex interaction that involved major metabolic changes in root cells, an array of defense-related reactions was produced, as exemplified by the formation of wall appositions and plugging of host cells with osmiophilic, electron-dense, granular, or fibrillar materials. P. uncinulatum growth was restricted to the epidermis and outer cortex tissues and associated with relatively minor damage to host cells. P. uncinulatum colonization of root tissues did not result in defense events similar to those observed in Pythium group F-infected inner cortex and stele tissues. Moreover, most of the invading P. uncinulatum hyphae were moribund. The results of the current study indicated that symptomless infections can be insignificant in terms of pathology for the plant (i.e., P. uncinulatum) or can be potentially dangerous (i.e., Pythium group F). Our results clearly showed a striking difference between nonpathogenic and minor pathogenic Pythium spp. attacks. The description of the Pythium group F infection process suggests that this interaction is unique, because the fungus behaves as a necrotrophic fungus in the epidermis and outer cortex tissues, whereas it is a potential inducer of plant defense reactions in the inner cortex and stele tissues. To our knowledge, cytological events similar to those observed with Pythium group F have not been described until now, even though descriptions of these events could help elucidate several aspects of the relationships between plants and minor pathogens.
journal_name
Phytopathologyjournal_title
Phytopathologyauthors
Rey P,Benhamou N,Tirilly Ydoi
10.1094/PHYTO.1998.88.3.234subject
Has Abstractpub_date
1998-03-01 00:00:00pages
234-44issue
3eissn
0031-949Xissn
1943-7684journal_volume
88pub_type
杂志文章相关文献
PHYTOPATHOLOGY文献大全abstract::ABSTRACT A 3.3-kb fragment of genomic DNA from bacteriophage Phi-Ea1h encoding an amylovoran-directed depolymerase lyase was sequenced, and three open reading frames (ORFs) were detected. The first ORF could encode a lysozyme and the second a holin that may form a pore supporting cell lysis by the lysozyme. The third ...
journal_title:Phytopathology
pub_type: 杂志文章
doi:10.1094/PHYTO.2000.90.11.1263
更新日期:2000-11-01 00:00:00
abstract::In this study, spatial analyses were conducted at three different scales to better understand the epidemiology of rice blast, a major rice disease caused by Magnaporthe oryzae. At the regional scale, across the major rice production regions in China, rice blast incidence was monitored on 101 dates at 193 stations from...
journal_title:Phytopathology
pub_type: 杂志文章
doi:10.1094/PHYTO-01-18-0006-R
更新日期:2018-11-01 00:00:00
abstract::The fungus Rhizoctonia oryzae-sativae is an important pathogen that causes the aggregated sheath spot disease on rice. In this study, we investigated the genetic structure of rice-adapted populations of R. oryzae-sativae sampled from traditional rice-cropping areas from the Paraíba Valley, São Paulo, Brazil, and from ...
journal_title:Phytopathology
pub_type: 杂志文章
doi:10.1094/PHYTO-05-16-0219-R
更新日期:2017-01-01 00:00:00
abstract::ABSTRACT Suppressive effects of soil amendment with residues of 12 cultivars of Brassica rapa on damping-off of sugar beet were evaluated in soils infested with Rhizoctonia solani. Residues of clover and peanut were tested as noncruciferous controls. The incidence of damping-off was significantly and consistently supp...
journal_title:Phytopathology
pub_type: 杂志文章
doi:10.1094/PHYTO-96-1372
更新日期:2006-12-01 00:00:00
abstract::ABSTRACT Comparison of a sampling of complementary DNA (cDNA) sequences from the Florida citrus tristeza virus (CTV) isolates T3 and T30 to the sequence of the genome of the Israeli isolate VT showed a relatively consistent or symmetrical distribution of nucleotide sequence identity in both the 5' and 3' regions of th...
journal_title:Phytopathology
pub_type: 杂志文章
doi:10.1094/PHYTO.1999.89.4.336
更新日期:1999-04-01 00:00:00
abstract::Potato genotypes from a breeding population adapted to tropical highlands were analyzed for the stability of late blight resistance and also for marker-phenotype association. We harmonized the historical evaluation data, consisting of observations spanning 6 years from two field sites utilizing a resistance scale cons...
journal_title:Phytopathology
pub_type: 杂志文章
doi:10.1094/PHYTO-10-13-0270-R
更新日期:2014-06-01 00:00:00
abstract::We used a real time polymerase chain reaction-based assay and visual disease assessment to evaluate the efficacies of Js399-19, tebuconazole, a mixture of tebuconazole and thiram, azoxystrobin, carbendazim, and thiram on the development of Fusarium head blight (FHB) and deoxynivalenol (DON) contamination and on the yi...
journal_title:Phytopathology
pub_type: 杂志文章
doi:10.1094/PHYTO-99-1-0095
更新日期:2009-01-01 00:00:00
abstract::ABSTRACT During the infection of citrus fruit by Penicillium digitatum there is little evidence of a host defense response. This suggests that P. digitatum has the ability to suppress host defenses. The current study demonstrates that P. digitatum suppresses a defense-related hydrogen peroxide (H(2)O(2)) burst in host...
journal_title:Phytopathology
pub_type: 杂志文章
doi:10.1094/PHYTO-97-11-1491
更新日期:2007-11-01 00:00:00
abstract::Sudden death syndrome (SDS) of soybean has become a serious constraint to the production of this crop in North and South America. Phenotypic and multilocus molecular phylogenetic analyses, as well as pathogenicity experiments, have demonstrated that four morphologically and phylogenetically distinct fusaria can induce...
journal_title:Phytopathology
pub_type: 杂志文章
doi:10.1094/PHYTO-100-1-0058
更新日期:2010-01-01 00:00:00
abstract::ABSTRACT Application of salicylic acid induces systemic acquired resistance in tobacco. pchA and pchB, which encode for the biosynthesis of salicylic acid in Pseudomonas aeruginosa, were cloned into two expression vectors, and these constructs were introduced into two root-colonizing strains of P. fluorescens. Introdu...
journal_title:Phytopathology
pub_type: 杂志文章
doi:10.1094/PHYTO.1998.88.7.678
更新日期:1998-07-01 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::Before 1991, Xanthomonas euvesicatoria (Xe) was the causal agent of bacterial spot of tomato in Florida but was quickly replaced by Xanthomonas perforans (Xp). The Xp population has changed in genotype and phenotype despite lack of a clear selection pressure. To determine the current Xanthomonas population in Florida,...
journal_title:Phytopathology
pub_type: 杂志文章
doi:10.1094/PHYTO-09-20-0402-R
更新日期:2020-10-13 00:00:00
abstract::Trichoderma gamsii T6085 was used in combination with a Fusarium oxysporum isolate (7121) in order to evaluate, in a multitrophic approach, their competitive ability against F. graminearum, one of the main causal agents of Fusarium head blight (FHB) on wheat. The two antagonists and the pathogen were coinoculated on t...
journal_title:Phytopathology
pub_type: 杂志文章
doi:10.1094/PHYTO-04-18-0123-R
更新日期:2019-04-01 00:00:00
abstract::Late blight caused by Phytophthora infestans (Mont.) de Bary is a constraint to both potato and tomato crops in Nicaragua. The hypothesis that the Nicaraguan population of P. infestans is genotypically and phenotypically diverse and potentially subdivided based on host association was tested. A collection of isolates ...
journal_title:Phytopathology
pub_type: 杂志文章
doi:10.1094/PHYTO-02-11-0033
更新日期:2012-03-01 00:00:00
abstract::The vacuolar H+-ATPases (V-ATPases) are conserved ATP-dependent proton pumps that acidify intracellular compartments in eukaryotic cells. The role of Cpvma1, a V-ATPase catalytic subunit A of Cryphonectria parasitica, was investigated by generating cpvma1-overexpressing and cpvma1-silenced strains. The mutant strains ...
journal_title:Phytopathology
pub_type: 杂志文章
doi:10.1094/PHYTO-08-18-0289-R
更新日期:2019-08-01 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::Mummy berry, caused by Monilinia vaccinii-corymbosi, causes economic losses of highbush blueberry in the U.S. Pacific Northwest (PNW). Apothecia develop from mummified berries overwintering on soil surfaces and produce ascospores that infect tissue emerging from floral and vegetative buds. Disease control currently re...
journal_title:Phytopathology
pub_type: 杂志文章
doi:10.1094/PHYTO-04-17-0162-R
更新日期:2017-11-01 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::Xanthomonas oryzae pv. oryzicola is an important bacterial pathogen responsible for outbreaks of bacterial leaf streak (BLS) on rice, mostly occurring in Asia and parts of Africa. To better monitor epidemics and assess population structures, efficient tools that allow the precise identification and diagnosis of pathog...
journal_title:Phytopathology
pub_type: 杂志文章
doi:10.1094/PHYTO-04-12-0078-R
更新日期:2012-10-01 00:00:00
abstract::ABSTRACT Rain simulation studies were performed to compare splash dispersal of three Colletotrichum species: C. acutatum (C. acutatum-O isolate from Ohio and C. acutatum-M isolate from Mississippi), C. fragariae (isolate from Mississippi), and C. gloeosporioides (isolate from Florida). Conidial dispersal was assessed ...
journal_title:Phytopathology
pub_type: 杂志文章
doi:10.1094/PHYTO.1999.89.7.555
更新日期:1999-07-01 00:00:00
abstract::The pathogen that causes Pierce's disease of grapevine, Xylella fastidiosa, is the only known bacterial, arthropod-transmitted plant pathogen that does not circulate in the vector's hemolymph. Instead, bacteria are foregut-borne, persistent in adult vectors but semipersistent in immatures (i.e., bacteria colonize cuti...
journal_title:Phytopathology
pub_type: 杂志文章
doi:10.1094/PHYTO-09-10-0231
更新日期:2011-08-01 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::Pythium species are important soilborne pathogens occurring in the forest nursery industry of the Pacific Northwest. However, little is known about their genetic diversity or population structure and it is suspected that isolates are moved among forest nurseries on seedling stock and shared field equipment. In order t...
journal_title:Phytopathology
pub_type: 杂志文章
doi:10.1094/PHYTO-05-14-0147-R
更新日期:2015-05-01 00:00:00
abstract::ABSTRACT Relationships between disease incidence measured at two levels in a spatial hierarchy are derived. These relationships are based on the properties of the binomial distribution, the beta-binomial distribution, and an empirical power-law relationship that relates observed variance to theoretical binomial varian...
journal_title:Phytopathology
pub_type: 杂志文章
doi:10.1094/PHYTO.1997.87.5.542
更新日期:1997-05-01 00:00:00
abstract::Grapevine downy mildew (GDM) is a severe disease of grapevines. Because of the lack of reliable information about the dates of GDM symptom onset, many vine growers begin fungicide treatments early in the season. We evaluate the extent to which such preventive treatments are justified. Observational data for 266 untrea...
journal_title:Phytopathology
pub_type: 杂志文章
doi:10.1094/PHYTO-12-17-0412-R
更新日期:2019-05-01 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
abstract::ABSTRACT A collection of race 1 and race 2 isolates of Fusarium oxysporum f. sp. lycopersici was screened for vegetative compatibility and characterized by random amplified polymorphic DNA (RAPD) analysis to establish the identity and genetic diversity of the isolates. Comparison of RAPD profiles revealed two main gro...
journal_title:Phytopathology
pub_type: 杂志文章
doi:10.1094/PHYTO.1999.89.2.156
更新日期:1999-02-01 00:00:00
abstract::Dark pigmented fungi of the Gaeumannomyces-Phialophora complex were isolated from the roots of wheat grown in fields in eastern Washington State. These fungi were identified as Phialophora spp. on the basis of morphological and genetic characteristics. The isolates produced lobed hyphopodia on wheat coleoptiles, phial...
journal_title:Phytopathology
pub_type: 杂志文章
doi:10.1094/PHYTO-100-5-0404
更新日期:2010-05-01 00:00:00
abstract::ABSTRACT Infection of soybean (Glycine max) plants inoculated with particles of Alfalfa mosaic virus (AlMV) isolate 425 at 12 days after germination was monitored throughout the life cycle of the plant (vegetative growth, flowering, seed formation, and seed maturation) by western blot analysis of tissue samples. At 8 ...
journal_title:Phytopathology
pub_type: 杂志文章
doi:10.1094/PHYTO.2001.91.10.941
更新日期:2001-10-01 00:00:00
abstract::The smut fungi form a large, diverse, and nonmonophyletic group of plant pathogens that have long served as both important pests of human agriculture and, also, as fertile organisms of scientific investigation. As modern techniques of molecular genetic analysis became available, many previously studied species that pr...
journal_title:Phytopathology
pub_type: 杂志文章,评审
doi:10.1094/PHYTO-02-16-0075-RVW
更新日期:2016-11-01 00:00:00