The Inheritance of Resistance to <i>Septoria</i> Glume Blotch II. The Wild Wheat Species <i>Aegilops speltoides</i>

Ecker, R.; Cahaner, A.; Dinoor, A.

doi:10.1111/j.1439-0523.1990.tb00426.x

Cited by 10 publications

(7 citation statements)

References 19 publications

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“…A . similar "susceptible deviation" of F2 and F3 was observed in T. aestivum (ECKER et al 1989a), but with the Fj at the mid-parent point. In contrast, the additive-dominance model was found adequate for the control of glume blotch resistance in the species Ae, speltoides (ECKER et al 1989 b).…”

Section: Discussionsupporting

confidence: 73%

“…Sources of resistance to the disease were found in cultivated wheat (SCHAREN and EYAE 1980, NASS and JOHNSTON 1985, GRIFFITHS and JONES 1987, CUNEER et al 1988) and also in some of its wild relatives (SCOTT and BENEDIKZ 1980, SCOTT et al 1981, ToMEREiN et al 1984, ECKER et al 1989b. The resistance to Septoria glume blotch in the cultivated bread wheat {T. aestivum) is polygenica-Iy inherited (ROSIEELE and BROWN 1980, RAPIL-EY 1981, NEESON and GATES 1982, KARJAEAINEN 1983, ECKER et al 1989a). The nature and mode of inheritance of the resistance in the wild wheat species have not been reported so far.…”

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confidence: 99%

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The Inheritance of Resistance to Septoria Glume Blotch III. The Wild Wheat Species Aegilops Jongissima

Ecker¹,

Cahaner²,

Dinoor

1990

Plant Breeding

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AhstractThe genetics of resistance to Septoria glume blotch (caused by the pathogen Septoria nodorum Berk.) in the wild wheat species Ae. longissima was investigated. The resistance was characterized by two parameters measured on detached leaves -lesion size (LS) and length of latent period (LP), and by disease severity (DS) under field conditions. Generations F,, F2 and F3, derived from a cross between two Ae. longissima accessions, were analyzed. The two parameters measured on detached leaves (LS and LP) were highly correlated, while DS was moderately correlated to both LS and LP. The mean LS and the mean LP of Fi generation indicated considerable dominance for resistance in both parameters. The estimates of broad-sense and narrow-sense heritability were moderate for LS and LP (0.21-0.55). Narrow-sense heritability for DS was high {0.77). Estimates of the number of genes controlling each of the parameters (LS, LP, DS) were between 2.5-3.2. It is suggested that the resistance is controlled by three to four quantitative genes with a partial dominance of the alleles for resistance. Indications for genic interaction were found in LS and in LP. A model of inheritance containing complementation between dominant resistance-alleles is suggested. Highly resistant/le. longissima accessions are recommended as sources of germplasm for improving the resistance of cultivated wheats to Septoria glume blotch. The possibility of using dominant alleles for resistance in hybrid cultivars is discussed.

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Section: Discussionsupporting

confidence: 73%

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confidence: 99%

The Inheritance of Resistance to Septoria Glume Blotch III. The Wild Wheat Species Aegilops Jongissima

Ecker¹,

Cahaner²,

Dinoor

1990

Plant Breeding

Self Cite

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“…The reaction of F 1 plants and the segregation of F 2 and F 2:3 populations from the reciprocal crosses of 1644/1193 and 1193/1644 indicated that no maternal effects were involved in the inheritance of leaf rust and stem rust resistance (Tables 2 and 3). A similar result was reported by Ecker et al (2,3) in their study on the genetics of Septoria glume blotch resistance in the closely related species of A. speltoides and A. longissima. In contrast, marked differences were detected in the F 2 segregation ratio of reciprocal crosses between leaf rust resistant and susceptible A. speltoides accessions (E. Millet, unpublished data).…”

Section: Resultssupporting

confidence: 81%

“…This study was the first to characterize the genetics of disease resistance in A. sharonensis, and one of the few completed in any of the species of the section Sitopsis (2,3). Our results clearly demonstrated that resistance to wheat leaf rust, stem rust, and powdery mildew in A. sharonensis is controlled by dominant genes with major effect.…”

Section: Resultsmentioning

confidence: 52%

Genetics of Resistance to Wheat Leaf Rust, Stem Rust, and Powdery Mildew in Aegilops sharonensis

Olivera¹,

Millet²,

Anikster³

et al. 2008

Phytopathology®

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Aegilops sharonensis (Sharon goatgrass) is a wild relative of wheat and a rich source of genetic diversity for disease resistance. The objectives of this study were to determine the genetic basis of leaf rust, stem rust, and powdery mildew resistance in A. sharonensis and also the allelic relationships between genes controlling resistance to each disease. Progeny from crosses between resistant and susceptible accessions were evaluated for their disease reaction at the seedling and/or adult plant stage to determine the number and action of genes conferring resistance. Two different genes conferring resistance to leaf rust races THBJ and BBBB were identified in accessions 1644 and 603. For stem rust, the same single gene was found to confer resistance to race TTTT in accessions 1644 and 2229. Resistance to stem rust race TPMK was conferred by two genes in accessions 1644 and 603. A contingency test revealed no association between genes conferring resistance to leaf rust race THBJ and stem rust race TTTT or between genes conferring resistance to stem rust race TTTT and powdery mildew isolate UM06-01, indicating that the respective resistance genes are not linked. Three accessions (1644, 2229, and 1193) were found to carry a single gene for resistance to powdery mildew. Allelism tests revealed that the resistance gene in accession 1644 is different from the respective single genes present in either 2229 or 1193. The simple inheritance of leaf rust, stem rust, and powdery mildew resistance in A. sharonensis should simplify the transfer of resistance to wheat in wide crosses.

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“…This is usually done using standard bi-parental crosses and molecular mapping to determine the number and chromosomal location of rust resistance genes (Ecker et al 1990;Yang et al 2003). An alternative means for mapping and tagging rust resistance genes that does not require bi-parental crosses is association mapping.…”

Section: Introductionmentioning

confidence: 99%

A walk on the wild side: mining wild wheat and barley collections for rust resistance genes

Steffenson

Olivera

Roy

et al. 2007

Aust. J. Agric. Res.

105

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Leaf rust, stem rust, and stripe rust are among the most important diseases of wheat and barley worldwide and are best controlled using genetic resistance. To increase the diversity of rust resistance in wheat and barley, a project was initiated to identify and characterise rust resistance genes from the wild species of Aegilops sharonensis (Sharon goatgrass) and Hordeum vulgare ssp. spontaneum (wild barley), respectively. One hundred and two accessions of Sharon goatgrass from Israel and 318 Wild Barley Diversity Collection (WBDC) accessions from the Fertile Crescent, Central Asia, North Africa, and the Caucasus region were evaluated for resistance to leaf rust, stem rust, and/or stripe rust. Sharon goatgrass exhibited a wide range of infection types (ITs) in response to leaf rust, stem rust, and stripe rust. The percentage of resistant accessions in Sharon goatgrass was 58.8-78.4% for leaf rust, 11.8-69.6% for stem rust, and 46.1% for stripe rust, depending on the race used and the plant growth stage. Genetic studies with Sharon goatgrass revealed oligogenic resistance to leaf rust and stem rust. Wild barley also exhibited a wide range of ITs to leaf rust and stem rust; however, the overall frequency of resistance was lower than for Sharon goatgrass. The percentage of resistant accessions in wild barley was 25.8% for leaf rust and 5.7-20.1% for stem rust, depending on the race used. Resistance to the new virulent stem rust race TTKS (i.e. Ug99), present in eastern Africa, was found in both Sharon goatgrass (70% of accessions) and wild barley (25% of 20 accessions tested). Association mapping for stem rust resistance was applied in the WBDC using Diversity Arrays Technology (DArT) markers. Using the highly conservative P value threshold of 0.001, 14 and 15 significant marker associations were detected when the number of subpopulations (K value) was set for 10 and 8, respectively. These significant associations were in 9 and 8 unique chromosome bins, respectively. Two significant marker associations were detected for resistance to the wheat stem rust race MCCF in the same bin as the rpg4/Rpg5 complex on chromosome 7(5H). The presence of a major stem rust resistance gene in this bin on chromosome 7(5H) was validated in a bi-parental mapping population (WBDC accession Damon × cv. Harrington) constructed with DArT markers. The results from this study indicate that Sharon goatgrass and wild barley are rich sources of rust resistance genes for cultivated wheat and barley improvement, respectively, and that association mapping may be useful for positioning disease resistance genes in wild barley.

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The Inheritance of Resistance to Septoria Glume Blotch II. The Wild Wheat Species Aegilops speltoides

Cited by 10 publications

References 19 publications

The Inheritance of Resistance to Septoria Glume Blotch III. The Wild Wheat Species Aegilops Jongissima

The Inheritance of Resistance to Septoria Glume Blotch III. The Wild Wheat Species Aegilops Jongissima

Genetics of Resistance to Wheat Leaf Rust, Stem Rust, and Powdery Mildew in Aegilops sharonensis

A walk on the wild side: mining wild wheat and barley collections for rust resistance genes

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