Postulação de genes (Lr) de resistência à ferrugem da folha em cultivares brasileiras de trigo

Zoldan, Sandra Maria; Barcellos, Amarilis Labes

doi:10.1590/s0100-41582002000500012

Cited by 6 publications

(6 citation statements)

References 18 publications

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“…Trigo BR 35 showed moderate susceptible reaction (3 3 -) to MCG race and a moderate level of resistance to race LPG (2 3 -). The infection types are in accordance with the reaction conditioned by the Lr26 gene that was previously indicated to be in this cultivar (Rosa Filho, 1997;Zoldan, 1998).…”

Section: Analysis At First Leaf Stagesupporting

confidence: 84%

Genetic analysis of adult-plant resistance to leaf rust in a double haploid wheat (Triticum aestivum L. em Thell) population

et al. 2004

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A genetic analysis of adult plant resistance to leaf rust (Puccinia triticina) was performed in in vitro obtained double haploid progenies from a cross between the Brazilian wheat cultivar Trigo BR 35, which, under the high inoculum pressure of the southern region, has been resistant to leaf rust for more than 12 years, and the susceptible cultivar IAC 13-Lorena. Haplodiploidization via in vitro gimnogenesis was done by somatic elimination of the pollen donor genome after maize pollination of the F 1 plants. The advantages and usefulness of double haploids (DH) for genetic analysis of complex inherited traits like durable adult-plant resistance to wheat leaf rust were evident: it was possible to analyze inheritance patterns in this cross by using only the 35 DH homozygous segregant lines obtained by in vitro embryo culture of F 1 flowers pollinated by maize, this number being equivalent to 1,225 conventional F 2 lines because of lack of heterozygosity. After being infected with MCG and LPG races, the results indicated that Trigo BR 35 has two resistance genes. One of the genes expressed resistance only after the intermediate stage of plant development (5-6 leaves).

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Section: Analysis At First Leaf Stagesupporting

confidence: 84%

Genetic analysis of adult-plant resistance to leaf rust in a double haploid wheat (Triticum aestivum L. em Thell) population

et al. 2004

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“…A high Lr1 frequency was previously reported in American hard red spring wheat, Australian wheat cultivars, Indian and Pakistani wheat, Mexican bread wheat and Chinese cultivars (Oelke and Kolmer 2004; Singh et al 1999, 2007; Singh and Gupta 1991; Singh and Rajaram 1991) but was rare in Argentinian germplasm (Vanzetti et al 2011). Lr10 was commonly postulated in international winter wheat nurseries, Indian and Pakistani wheat cultivars, Mexican bread wheat, Brazilian and Argentinian wheat cultivars (McVey 1992; Singh and Gupta 1991; Singh and Rajaram 1991; Vanzetti et al 2011; Zoldan and Barcellos 2002). Conversely, Lr2a and Lr9 were rare in the WC with one accession each but were common in American soft red winter wheat (Roelfs et al 2000; Wamishe and Milus 2004) and in cultivars from the UK (Singh et al 2001).…”

Section: Discussionmentioning

confidence: 99%

Molecular and phenotypic characterization of seedling and adult plant leaf rust resistance in a world wheat collection

et al. 2013

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Genetic resistance is the most effective approach to managing wheat leaf rust. The aim of this study was to characterize seedling and adult plant leaf rust resistance of a world wheat collection. Using controlled inoculation with ten races of Puccinia triticina, 14 seedling resistance genes were determined or postulated to be present in the collection. Lr1, Lr3, Lr10 and Lr20 were the most prevalent genes around the world while Lr9, Lr14b, Lr3ka and/or Lr30 and Lr26 were rare. To confirm some gene postulations, the collection was screened with gene-specific molecular markers for Lr1, Lr10, Lr21 and Lr34. Although possessing the Lr1 and/or Lr10 gene-specific marker, 51 accessions showed unexpected high infection types to P. triticina race BBBD. The collection was tested in the field, where rust resistance ranged from nearly immune or highly resistant with severity of 1 % and resistant host response to highly susceptible with severity of 84 % and susceptible host response. The majority of the accessions possessing the adult plant resistance (APR) gene Lr34 had a maximum rust severity of 0–35 %, similar to or better than accession RL6058, a Thatcher-Lr34 near-isogenic line. Many accessions displayed an immune response or a high level of resistance under field conditions, likely as a result of synergy between APR genes or between APR and seedling resistance genes. However, accessions with three or more seedling resistance genes had an overall lower field severity than those with two or fewer. Immune or highly resistant accessions are potential sources for improvement of leaf rust resistance. In addition, some lines were postulated to have known but unidentified genes/alleles or novel genes, also constituting potentially important sources of novel resistance.Electronic supplementary materialThe online version of this article (doi:10.1007/s11032-013-9899-8) contains supplementary material, which is available to authorized users.

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“…Eleven of the postulated genes in the studied materials were previously reported in CIMMYT germplasm (Lr1, Lr2a, Lr3a, Lr3bg, Lr10, Lr16, Lr17, Lr23, Lr24, Lr26, Lr27+31) (10)( 22) (44)(45)(46)(47)(48) . Lr1, Lr3a, Lr10, Lr16, Lr17, Lr24 and Lr26 were reported in cultivars and lines in Argentina, Brazil and Uruguay (25)(32-33) (49) . Lr3bg and Lr23 are present in materials from Brazil and Uruguay (25)(32) (49) and Lr27+Lr31 in materials from Brazil (49) .…”

Section: Discussionmentioning

confidence: 99%

“…Lr1, Lr3a, Lr10, Lr16, Lr17, Lr24 and Lr26 were reported in cultivars and lines in Argentina, Brazil and Uruguay (25)(32-33) (49) . Lr3bg and Lr23 are present in materials from Brazil and Uruguay (25)(32) (49) and Lr27+Lr31 in materials from Brazil (49) . The Lr3ka gene, postulated in 4 genotypes, was first reported in the Argentine cultivar Klein Aniversario (43) and has also been postulated in genotypes of Brazil and Argentina (33)(49) .…”

Section: Discussionmentioning

confidence: 99%

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Resistance to leaf rust in cultivars and wheat lines of Paraguay

Scholz¹,

Pereyra²,

Silva³

et al. 2023

Agrocienc Urug

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Leaf rust (LR) of bread wheat (Triticum aestvium L.), caused by the fungus Puccinia triticina Eriks, is one of the most important diseases in Paraguay, the Southern Cone and worldwide. The economic importance of the disease is clear considering that two or more fungicide applications are necessary to control it in susceptible cultivars. The best strategy for the management of this disease is through genetic resistance. This research was conducted in Uruguay aiming to postulate the LR resistance genes present in 102 lines and wheat cultivars from Paraguay, and to study their field resistance. The presence of 18 major resistance genes expressed at the seedling stage (Lr1, Lr2, Lr3a, Lr3bg, Lr3ka, Lr9, Lr10, Lr11, Lr16, Lr17, Lr23, Lr24, Lr26, Lr27+Lr31, Lr28, Lr30, Lr42) was postulated based on the reaction to different races of the pathogen. The adult plant resistance gene Lr34 was confirmed in 26% of the materials, based on the molecular marker csLV34. This study also allowed differentiating materials with field resistance that can be explained by the seedling resistance and those with adult plant resistance. Knowledge of the resistance genes present in the germplasm of breeding programs is of paramount importance to establish strategies in order to achieve effective and long-lasting resistance based mainly on the combination of race-non-specific minor genes.

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Postulação de genes (Lr) de resistência à ferrugem da folha em cultivares brasileiras de trigo

Cited by 6 publications

References 18 publications

Genetic analysis of adult-plant resistance to leaf rust in a double haploid wheat (Triticum aestivum L. em Thell) population

Genetic analysis of adult-plant resistance to leaf rust in a double haploid wheat (Triticum aestivum L. em Thell) population

Molecular and phenotypic characterization of seedling and adult plant leaf rust resistance in a world wheat collection

Resistance to leaf rust in cultivars and wheat lines of Paraguay

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