Characterization of cereal bare patch isolates of <i>Rhizoctonia solani</i> by random amplified polymorphic DNA analysis

Yang, Huaan; Sivasithamparam, Krishnapillai; Barton, Joanne E.; O’Brien, P.A.

doi:10.1111/j.1365-3059.1995.tb02740.x

Cited by 11 publications

(6 citation statements)

References 18 publications

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“…The level of genotypic diversity within the AG 1‐IB population was relatively high with 59% of the theoretical maximum for all isolates collected in the first and in the sixth crop. Based on molecular markers like random amplified polymorphic DNA (RAPD) fingerprints, Yang et al. (1995) suggested a limited level of genetic variability of R. solani AG 8 on cereal crops.…”

Section: Discussionmentioning

confidence: 99%

Impact of Continuous Cropping of Lettuce on the Disease Dynamics of Bottom Rot and Genotypic Diversity of Rhizoctonia solani AG 1-IB

Grosch

Schneider²,

Kofoet

et al. 2010

Journal of Phytopathology

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The impact of continuous cropping of lettuce on the disease dynamics of bottom rot and genotypic diversity of the causal pathogen Rhizoctonia solani AG 1-IB was studied over 3 years with two crops per year within a field naturally infested with R. solani the pathogen. This field had not had lettuce cultivated in it for 7 years. The disease incidence (DI) and disease severity (DS) were assessed at each harvest and mapped. Surprisingly, a high DI was already observed in the first crop of year one of this field study. In addition, the pathogen was also found to be evenly distributed. Severely infected plants occurred mainly in patches, and the position varied between crops. A significant increase in DS was already observed in the second year, and both temperature conditions and continuous cropping influenced the DS on average over time. Rhizoctonia isolates were randomly collected from the first crop in 1999 and the sixth crop in 2001. The genotypic diversity within the subgroup of R. solani AG 1-IB was analysed by BOX-PCR genomic fingerprinting and the aggressiveness of isolates by bioassay. The fingerprints revealed a high level of genotypic diversity within the AG 1-IB field population. However, continuous cropping was found not to have an impact on genotypic diversity and aggressiveness.

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Section: Discussionmentioning

confidence: 99%

Impact of Continuous Cropping of Lettuce on the Disease Dynamics of Bottom Rot and Genotypic Diversity of Rhizoctonia solani AG 1-IB

Grosch

Schneider²,

Kofoet

et al. 2010

Journal of Phytopathology

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show abstract

“…Here they find an association of anastomosis reaction type with isozyme phenotype, and an overrepresentation of certain phenotypes, which they take as evidence for clonality. Yang et al found a similar lack of variation with RAPDs, which again argues for clonal spread (174). Given the importance of space and time in the evolution of pathogens, studies of R. solani AGs in their native locations (e.g.…”

Section: Local To Regional Scale Differences In Population Structurementioning

confidence: 96%

THEEVOLUTION OFASEXUALFUNGI: Reproduction, Speciation and Classification

Taylor

Jacobson

Fisher

1999

Annu. Rev. Phytopathol.

467

351

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Phylogenetic and population genetic methods that compare nucleic acid variation are being used to identify species and populations of pathogenic fungi and determine how they reproduce in nature. These studies show that asexual or sexual reproductive morphology does not necessarily correlate with clonal or recombining reproductive behavior, and that fungi with all types of reproductive morphologies and behaviors can be accommodated by a phylogenetic species concept. Although approximately one fifth of described fungi have been thought to be asexual and clonal, recent studies have shown that they are also recombining. Whether a particular pathogen reproduces clonally or by recombination depends on factors relating to its biology and its distribution in space and time. Knowing the identity of species and populations and their reproductive modes, while taking a broad view of pathogen behavior in space and time, should enhance the ability of pathologists to control pathogens and even predict their behavior.

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“…The RAPD method successfully provided new genetic markers for genomic fingerprinting of several R. solani AGs: AG 1 Pascual et al 2000), AG 2 (Toda et al 2004), AG 3 (Bounou et al 1999), AG 8 (Tommerup et al 1995;Yang et al 1995), and AG 9 (Yang et al 1996). The technique has been also used to understand the genetic relatedness of BNR AG-D (Nicolson and Parry 1996), UNR (Lilja et al 1996), and Rhizoctonia endophytes (Shan et al 2002).…”

Section: Rapd (Random Amplified Polymorphic Dna)mentioning

confidence: 97%

The advancing identification and classification of Rhizoctonia spp. using molecular and biotechnological methods compared with the classical anastomosis grouping

et al. 2006

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Anamorphic classification of Rhizoctonia spp. has been based on young cell nuclear numbers and hyphal fusion to anastomosis groups (AGs), in addition to the teleomorph classification. The widespread development of molecular biology techniques has added modern tools to support classification of organisms according to their genetics and evolutionary processes. These various methods have also been used in recent years for classification of Rhizoctonia. Data are continuously accumulating in the literature and the sequences in databases, which are readily available for researchers in the network systems. In the present review, attempts were made to describe and compare the advantages and disadvantages of the various methods for the classification of Rhizoctonia spp. Currently, the rDNAinternal transcribed spacer (ITS) sequence analysis seems to be the most appropriate method for classification of Rhizoctonia spp. Data of all the appropriate multinucleate Rhizoctonia (MNR) accumulated in GenBank were analyzed together in neighbor-joining (NJ) and maximumparsimony (MP) trees supplemented with percent sequence similarity within and among AGs and subgroups. Generally, the clusters of the isolate sequences were supportive of the AGs and subgroups based on hyphal fusion anastomosis. The review also indicates inaccuracies in designation of sequences of some isolates deposited in GenBank. The review includes detailed analyses of the MNR groups and subgroups, whereas complementary descriptions of the binucleate Rhizoctonia (BNR), uninucleate Rhizoctonia (UNR), and comprehensive interrelationships among all the currently available MNR, BNR, and UNR groups and subgroups in GenBank are to be discussed in a subsequent review article.

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Characterization of cereal bare patch isolates of Rhizoctonia solani by random amplified polymorphic DNA analysis

Cited by 11 publications

References 18 publications

Impact of Continuous Cropping of Lettuce on the Disease Dynamics of Bottom Rot and Genotypic Diversity of Rhizoctonia solani AG 1-IB

Impact of Continuous Cropping of Lettuce on the Disease Dynamics of Bottom Rot and Genotypic Diversity of Rhizoctonia solani AG 1-IB

THEEVOLUTION OFASEXUALFUNGI: Reproduction, Speciation and Classification

The advancing identification and classification of Rhizoctonia spp. using molecular and biotechnological methods compared with the classical anastomosis grouping

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