Resistance of Triticum dicoccoides Collected in Israel to Infection with Puccinia recondita tritici1

Moseman, J. G.; Nevo, Eviatar; Gerechter-Amitai, Z. K.; El-Morshidy, M. A.; Zohary, Daniel

doi:10.2135/cropsci1985.0011183x002500020014x

Cited by 47 publications

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“…Most of T. dicoccoides accessions from Israel are susceptible to leaf rust and only a small fraction of the accessions are resistant (Anikster et al 2005;Moseman et al 1985). Nevertheless, leaf rust resistance genes from T. dicoccoides were introgressed into cultivated wheat (Marais et al 2005).…”

Section: Morris 2006) In Wild Emmer Wheat (T Dicoccoides) Populatiomentioning

confidence: 99%

Rapid linkage disequilibrium decay in the Lr10 gene in wild emmer wheat (Triticum dicoccoides) populations

et al. 2010

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INTRODUCTION: Recombination is a key evolutionary factor enhancing diversity. However, the effect of recombination on diversity in inbreeding species is expected to be low. To estimate this effect, recombination and diversity patterns of Lr10 gene were studied in natural populations of the inbreeder species, wild emmer wheat (Triticum dicoccoides). Wild emmer wheat is the progenitor of most cultivated wheats and it harbors rich genetic resources for disease resistance. Lr10 is a leaf rust resistance gene encoding three domains: a coiled-coil, nucleotide-binding site, and leucine-rich repeat (CC-NBS-LRR). RESULTS: Lr10 was sequenced from 58 accessions representing 12 diverse habitats in Israel. Diversity analysis revealed a high rate of synonymous and non-synonymous substitutions (d (S) = 0.029, d (N) = 0.018, respectively) in the NBS-LRR domains. Moreover, in contrast to other resistance genes, in Lr10 the CC domain was more diverse than the NBS-LRR domains (d (S) = 0.069 vs. 0.029, d (N) = 0.094 vs. 0.018) and was subjected to positive selection in some of the populations. Seventeen recombination events were detected between haplotypes, especially in the CC domain. Linkage disequilibrium (LD) analysis has shown a rapid decay from r (2) = 0.5 to r (2) = 0.1 within a 2-kb span. CONCLUSION: These results suggest that recombination is a diversifying force for the R-gene, Lr10, in the selfing species T. dicoccoides. This is the first report of a short-range LD decay in wild emmer wheat. AbstractRecombination is a key evolutionary factor enhancing diversity. However, the effect of recombination on diversity in inbreeding species is expected to be low. To estimate this effect, recombination and diversity patterns of Lr10 gene were studied in natural populations of the inbreeder species, wild emmer wheat (Triticum dicoccoides). Wild emmer wheat is the progenitor of most cultivated wheats and it harbours rich genetic resources for disease resistance. Moreover, in contrast to other resistance genes, in Lr10 the CC domain was more diverse than the NBS-LRR domains ( d S = 0.069 vs. 0.029, d N =0.094 vs. 0.018) and was subjected to positive selection in some of the populations. Seventeen recombination events were detected between haplotypes, especially in the CC domain. Linkage disequilibrium (LD) analysis has shown a rapid decay from r 2 =0.5 to r 2 =0.1 within a 2 kb span. These results suggest that recombination is a diversifying force of the R-gene, Lr10, in the selfing species T. dicoccoides. This is the first report of a short range LD decay in wild emmer wheat.

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Section: Morris 2006) In Wild Emmer Wheat (T Dicoccoides) Populatiomentioning

confidence: 99%

Rapid linkage disequilibrium decay in the Lr10 gene in wild emmer wheat (Triticum dicoccoides) populations

et al. 2010

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“…The geographic patterns of resistance to leaf rust contrast with those of powdery mildew. Only few accessions (15%) proved resistant or moderately resistant (Moseman et al, 1984b), in contrast to the abundance of resistance (50%) against powdery mildew (Moseman et al, 1984a). Nevertheless, moderate leaf rust resistance shows a correlation with ecological factors.…”

Section: Correlations With Ecological Factorsmentioning

confidence: 93%

“…dicoccoides consisting of population samples collected at 10 sites in Israel. All populations were described geographically, ecologically, and allozymically by Nevo et al (1982); for their reactions to infection with E. grarninis tritici by Moseman et al (1984a), and to infection with P. recondita tritici by Moseman et al (1984b). The above description is summarized in Table I.…”

Section: Methodsmentioning

confidence: 99%

“…The avirulent/virulent formula for culture PRTUS #6 was 2a, 9, 16, 18, 19, 24/1,2c, 3d, 3, I0, 11, 17. The procedures and methods of inoculation and reading reactions and the variation in the reactions within and between T. dicoccoides accessions in the populations at the 10 sites are described in detail by Moseman et al, 1984a andMoseman et al, 1984b. We determined the associations of ecological factors and allozymic genotypes with resistance to E. . ~ ~= ~z >'~'~ graminis tritici.…”

Section: Methodsmentioning

confidence: 99%

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Patterns of resistance of Israeli wild emmer wheat to pathogens I. Predictive method by ecology and allozyme genotypes for powdery mildew and leaf rust

et al. 1985

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The association of ecological factors and allozyme markers with genotypes of tetraploid wild emmer wheat, Triticum dicoccoides, varying in resistance to four cultures of the pathogen Ervsiphe graminis tritici, and to one culture of Puccinia recondita tritici, which incite the diseases powdery mildew and leaf rust respectively, were explored theoretically and practically. The study involved 233 accessions comprising 10 populations representing the ecological range of 7". diococcoides in Israel. Our results indicate that genetic polymorphism for resistance to both pathogens is structured geographically, and is predictable by climatic as well as allozymic markers. Three variable combinations of water factors and temperature differentials significantly explain 0.27 and 0.14 of the spatial variance for resistance to powdery mildew and leaf rust, respectively, suggesting the involvement of natural selection. Several allozyme g~notypes, singly, or in combination, are significantly associated with disease resistance. We conclude that T. dicoccoides populations in Israel, which grow in the center of diversity of the species, contain large amounts of unexploited disease resistant genotypes. The populations could be effectively screened and utilized for producing resistant cultivars by means of ecological factors and allozyme markers as predictive guidelines.

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“…(1984Moseman et al . ( , 1985 are currently being used to develop hexaploid and tetraploid wheats resistant to powdery mildew, caused by Erysiphe graminis tritici, and to leaf rust (Puccinia recondita tritici) .…”

Section: Introductionmentioning

confidence: 99%

Resistance of wild emmer wheat to stem rust: Ecological, pathological and allozyme associations

1991

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Seedling resistance to wheat stem rust was determined in populations of wild emmer wheat, Triticum dicoccoides, and characterized by means of ecological factors and allozyme genotypes . Reactions to wheat stem rust were studied in 102 single plant accessions of T. dicoccoides from ten populations by inoculation with Puccinia graminis tritici race 14, isolate GSR-739 . Six populations displayed different degrees of response polymorphism with reactions ranging from high resistance to complete susceptibility, whereas four populations contained only susceptible plants . In some of the accessions, unexplained intrasib variation in resistance and intraplant variation of infection-types were found . Resistance to stem rust was negatively correlated with two ecological factors, altitude and number of 'Sharav' (hot-dry) days which are unfavorable to disease development . Variation in stem rust response was shown to exist in ecogeographic regions where climatic variables enhanced the development of the fungus, conceivably maintained by natural selection . Likewise, allozyme genotypes, single or in multiple loci combinations, appeared to be associated with resistance or susceptibility to rust . Such association need to be verified by genetic studies in order to become established as useful markers .

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Resistance of Triticum dicoccoides Collected in Israel to Infection with Puccinia recondita tritici¹

Cited by 47 publications

References 0 publications

Rapid linkage disequilibrium decay in the Lr10 gene in wild emmer wheat (Triticum dicoccoides) populations

Rapid linkage disequilibrium decay in the Lr10 gene in wild emmer wheat (Triticum dicoccoides) populations

Patterns of resistance of Israeli wild emmer wheat to pathogens I. Predictive method by ecology and allozyme genotypes for powdery mildew and leaf rust

Resistance of wild emmer wheat to stem rust: Ecological, pathological and allozyme associations

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