Quantitative Determination of the Gene Action of Leaf Rust Resistance in Four Cultivars of Wheat,<i>Triticum aestivum</i>

Bjarko, M. E.

doi:10.1094/phyto-78-451

Cited by 35 publications

(21 citation statements)

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“…Leaf rust is common in South America, and under favorable environmental conditions, it can cause significant damage to most wheat cultivars grown in this region (Bjarko et al, 1988;Barcellos et al, 2000;Huerta-Espino et al, 2011). Host plant resistance genes have been used to control this disease.…”

Section: Introductionmentioning

confidence: 99%

“…A few genes confer resistance during the adult plant growth stage and have the capacity to express slow-rusting resistance . In most cases, if the gene is recessive or partially recessive, it exhibits continuous variation in segregating populations and is under oligogenic control (Bjarko et al, 1988). To date, 4 slow-rusting adult plant resistance (APR) loci (resistant to leaf rust) have been identified, given gene designations, and mapped to specific genomic locations.…”

Section: Introductionmentioning

confidence: 99%

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Monosomic and molecular mapping of adult plant leaf rust resistance genes in the Brazilian wheat cultivar Toropi

Silva¹,

Brammer²,

Guerra³

et al. 2012

Genet. Mol. Res.

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ABSTRACT. Leaf rust is one of the most destructive diseases affecting wheat worldwide. The most effective way to control it is to use resistant cultivars. Resistance based on slow-rusting adult plant resistance (APR) genes has proven to be the best method for developing cultivars with durable resistance. A source of slow-rusting APR for leaf rust is the Brazilian wheat cultivar Toropi. The Toropi/IAC 13 F 2 and F 7 recombinant inbred lines (RILs) were developed in previous studies. Phenotypic analysis of the F 2 and F 7 RILs showed that 2 recessive genes that were temporarily named trp-1 and trp-2 conferred APR in Toropi. In the present study, we used monosomic families and amplified fragment length polymorphism (AFLP), sequence-tagged site, and simple sequence repeat (SSR) markers to map trp-1 and trp-2 on wheat chromosomes. Analysis of the F 2 monosomic RIL showed that trp-1 and trp-2 were located on chromosomes 1A and 4D, respectively. AFLP analysis of the F 7 RIL identified 2 independent AFLP markers, XPacgMcac3 and XPacgMcac6, which were associated with Toropi APR. These markers explained 71.5% of the variation in the phenotypic data in a multiple linear regression model. The AFLP markers XPacg/ Mcac3 and XPacg/Mcac6 were anchored by SSR markers previously mapped on the short arms of chromosomes 1A (1AS) and 4D (4DS), respectively. The trp-2 gene is the first leaf rust resistance gene mapped on wheat chromosome 4DS. The mapping of trp-1 and trp-2 provides novel and valuable information that could be used in future studies involving the fine mapping of these genes, as well as in the identification of molecular markers that are closely related to these genes for markerassisted selection of this important trait in wheat.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Monosomic and molecular mapping of adult plant leaf rust resistance genes in the Brazilian wheat cultivar Toropi

Silva¹,

Brammer²,

Guerra³

et al. 2012

Genet. Mol. Res.

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“…Among several possible approaches currently known to reduce losses due to leaf rust, CIM-MYT's chosen strategy is to search for resistance, understand its genetic basis, and incorporate durable sources of resistance into high yielding germplasm. Durable resistance to leaf rust in wheat usualIy results from the additive interactions of a few (two to four) minor genes of partial (slow rusting) nature (Bjarko & Line, 1988;Broers & Jacobs, 1989;Kuhn et aI., 1980;Singh & Rajaram, 1992). When these partial genes are present alone, resistance is not complete.…”

Section: Introductionmentioning

confidence: 99%

Comparison of two crossing and four selection schemes for yield, yield traits, and slow rusting resistance to leaf rust in wheat

Singh¹,

Rajaram²,

Miranda³

et al. 1997

Developments in Plant Breeding

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SummaryThe most important breeding objectives in crop improvement are improving grain yield, grain quality, and resistances to various biotic and abiotic stresses. The objectives of our study were to compare two crossing and four selection schemes for grain yield, yield traits, and slow rusting resistance to leaf rust (Puccinia recondita) based on additive genes in wheat (Triticum aestivum), and to identify the most efficient crossing and selection methodologies in terms of genetic gains and cost efficiency. Segregating populations were derived from 18 simple crosses and the same number of top (three-way) crosses. Half of the crosses were derived from Yecora 70 and the other half from Veery #10 as the common leaf rust susceptible parents. The four selection schemes were: pedigree,

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“…The presence of both additive and non-additive gene effects has also been reported for the yellow rust of wheat by Krupinsky and Sharp (1978). Bjarko and Line (1988) have reported predominance of additive gene action for slow rusting resistance to leaf rust in wheat, while Skovmand et al (1978) reported same predominance for slow rusting resistance to stem rust resistance in wheat. The presence of interactions in controlling leaf rust resistance suggest that selection of resistant plant would be meaningful only in a later segregating generation (Yadav et al, 1999).…”

Section: Discussionmentioning

confidence: 73%

Genetic studies in wheat for leaf rust resistance (Puccinia recondita)

Hussain¹,

Ashraf²,

Hameed³

et al. 2011

Afr. J. Biotechnol.

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Leaf rust is a major disease of wheat crop in the world as a whole. This study was undertaken to find the genetic effects of adult plant leaf resistance in wheat (Triticum aestivum L.). Three wheat crosses were developed from three resistant and one susceptible parent. Six populations (P 1 , P 2 , F 1 , F 2 , BC 1 and BC 2 ) of each cross were grown under field conditions and were artificially inoculated with isolates of mixture of leaf rust prevalent races. Leaf rust intensity and reaction type were observed and the coefficient of infection was computed. Generation means and variance analyses were performed for the estimation of additive, dominance and epistatic genetic effects. Additive and dominance, as well as epistatic genetic effects, are involved in the inheritance of leaf rust resistance. However, the narrow sense heritability estimates were low, which also exhibited the presence of epistatic genetic effects. Thus, selection of resistant adult plant in later segregating generations would be useful for the development of high yielding wheat genotypes.

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Quantitative Determination of the Gene Action of Leaf Rust Resistance in Four Cultivars of Wheat,Triticum aestivum

Cited by 35 publications

References 0 publications

Monosomic and molecular mapping of adult plant leaf rust resistance genes in the Brazilian wheat cultivar Toropi

Monosomic and molecular mapping of adult plant leaf rust resistance genes in the Brazilian wheat cultivar Toropi

Comparison of two crossing and four selection schemes for yield, yield traits, and slow rusting resistance to leaf rust in wheat

Genetic studies in wheat for leaf rust resistance (Puccinia recondita)

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