Neue Testsortimente und Rassenbezeichnungen bei Mehltau (Erysiphe graminisDC. f. sp.tritici, hordei und secalisMarchal) und Zwergrost (Puccinia hordeiOtth)

Frauenstein, Käte; Meyer, Hoest; Walther, Ursula; Wolfram, Horst

doi:10.1080/03235408309432781

Cited by 8 publications

(5 citation statements)

References 8 publications

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“…The binary/octal modification ( Gilmour, 1973) apparently constitutes a substantial improvement over the binary/decanary code, as illustrated by the advantages discussed above. Applications to rust, mildew, and leaf blotch can be found in Frauenstein et al (1983 ) and in Goodwin et al (1990 ). The binary/decanary and binary/octal systems were both published in the early seventies in Nature ( Habgood, 1970; Gilmour, 1973).…”

Section: Gilmour's Triplet Codementioning

confidence: 99%

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A new tool for entry and analysis of virulence data for plant pathogens

1999

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The methods of Habgood (1970) and Gilmour (1973) for the assignment of pathogen race names are discussed and the advantages of a reversed octal system, based on Gilmour's octal code, are emphasized. A new spreadsheet, ‘HaGiS’, exploits these two designation systems to provide user‐friendly and fast access to some routine steps in the analysis of virulence data for plant pathogen populations. It produces graphs and tables for frequency distributions (of pathotypes, isolate complexities and cultivar susceptibilities); sorted lists (e.g. of the races ranked by predominance); indices (of sample diversity and of pathogenicity for each differential cultivar); and coloured proximity matrices. Use of HaGiS requires knowledge of only a few basic functions of MS Excel 97®. All graphs, tables, indices and matrices are generated automatically and displayed by switching to the corresponding worksheet. In addition to data analysis, the spreadsheet is convenient for the entry of experimental data, allowing for all commonly used assessment scales.

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Section: Gilmour's Triplet Codementioning

confidence: 99%

“…The binary/decanary and binary/octal systems were both published in the early seventies in Nature ( Habgood, 1970; Gilmour, 1973). Nevertheless, Gilmour's method still seems to be much less well known, and was therefore independently reintroduced several times in the past ( Frauenstein et al , 1983 ; Limpert & Müller, 1994).…”

Section: Gilmour's Triplet Codementioning

confidence: 99%

A new tool for entry and analysis of virulence data for plant pathogens

1999

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“…Although they thought to apply octal notation to pathotypes of Erysiphe graminis, tritid, hordei, and secalis and to Pucdnia hordei, FRAUENSTEIN et al (1983) already used, to be correct, the system of coded triplets. So did DREISESTL (1991) when he chose the system of FRAUENSTEIN et al (1983) and adapted the set of differentials for the barley mildew pathogen for Czechosiovakian needs. Thus, without having been noticed so far, the coded triplets have evolved twice, once starting from octal notation and once from decanary notation.…”

Section: Further Consideration Of Mathematicai Condensing Codes and mentioning

confidence: 99%

Designation of Pathotypes of Plant Pathogens

Limpert

Müller

1994

Journal of Phytopathology

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For evaluation and communication of data on populations of plant pathogens a sensible code to name pathotypes can be extremely helpful. Starting from a coding system proposed by Habgood in 1970, a system, called “coded triplets” is developed which has the same advantages but is easier to understand and to use. This is especially useful as, in the meantime, pathotypes did become increasingly complex due to the increased number of genes conferring race specific resistance in the host. An important advantage of the coded triplets is that codes change only at one digit if, for example, a new differentia) is added or if the pathotype changes from avirulence to virulence or vice versa on a single differential. In this way evoluationary patterns and changes in the pathogen population can be visualized easily. The system is used to describe complex data on haplotypes of the barley mildew pathogen, but it is suited equally well for designation of pathotypes of other pathogens. Some basic principles of coded triplets are similar to octal notation, described by Gilmour in 1973, which has, however, not become widely known. Reasons for this are discussed. – There is a fourth system belonging to the same group of mathematical, condensing codes. As there is reason to believe that the evolution of condensing codes is drawing to an end, the systems are compared extensively, and the benefits of a generally accepted designation are outlined.

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“…However, since the test collection was compiled, the genetic background of powdery mildew resistance in cultivated wheat varieties has completely changed, so the original varieties used for differentiation are no longer suitable for the detection of changes in the virulence of the natural pathogen population and in the dominance of different pathotypes. For the above reasons it has become necessary to include new Pm resistance genes in powdery mildew population tests (FRAUENSTEIN et al 1983;PERSAUD & LIPPS 1995;SZUNICS et al 2000). Unfortunately, as different varieties are used for differentiation it is difficult to compare the results achieved.…”

Section: Introductionmentioning

confidence: 99%

Comparison of two wheat powdery mildew differential sets in seedling tests

Vida¹,

Szunics²,

Gál³

et al. 2002

Plant Prot. Sci.

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Two wheat powdery mildew differential sets were tested in the seedling stage in the 2001/2002 season using 192 monoisolates. The data of genotypes carrying the same Pm gene in different genetic backgrounds were compared. Both varieties with gene Pm8 (Salzmünde14/44 and Disponent) were infected by all the isolates. Less than 10% of the isolates gave different responses on varieties with genes Pm2 and Pm3c (6 and 16, respectively). It is doubtful whether the degree of infection of genotypes carrying genes Pm1, Pm4b, Pm5, Pm6 or Pm7 can be compared, while it is completely impossible to compare the data for varieties from the old and new sets carrying genes Pm3a, Pm3b and Pm4a.

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Neue Testsortimente und Rassenbezeichnungen bei Mehltau (Erysiphe graminisDC. f. sp.tritici, hordei und secalisMarchal) und Zwergrost (Puccinia hordeiOtth)

Cited by 8 publications

References 8 publications

A new tool for entry and analysis of virulence data for plant pathogens

A new tool for entry and analysis of virulence data for plant pathogens

Designation of Pathotypes of Plant Pathogens

Comparison of two wheat powdery mildew differential sets in seedling tests

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