Person:
Ammar, K.

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Ammar
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Ammar, K.

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Now showing 1 - 10 of 11
  • Characterization of wheat yellow rust and stem rust virulence in Southern Spain
    (MDPI, 2023) Rodríguez-Vázquez, J.N.; Ammar, K.; Solís, I.; Martínez-Moreno, F.
    Publication
  • Virulence of Puccinia triticina and Puccinia tritici-duri on durum wheat in southern Spain, from 2020 to 2022
    (Firenze University Press, 2023) Rodríguez-Vázquez, J.N.; Ammar, K.; Solís, I.; Martínez-Moreno, F.
    Publication
  • QTL mapping of seedling and field resistance to stem rust in DAKIYE/Reichenbachii durum wheat population
    (Public Library of Science, 2022) Megerssa, S.H.; Ammar, K.; Acevedo, M.; Bergstrom, G.; Dreisigacker, S.; Randhawa, M.S.; Brown-Guedira, G.; Ward, B.; Sorrells, M.E.
    Publication
  • Acción génica y genes que otorgan resistencia a roya de la hoja en Trigo cristalino
    (Sociedad Mexicana de Fitogenetica, 2022) Delgado-Sánchez, L.M.; Huerta-Espino, J.; Benitez Riquelme, I.; Ammar, K.; Aguilar Rincón, V.H.; Corona-Torres, T.
    Publication
  • High density genetic mapping of stripe rust resistance in a ‘Strongfield’ / ‘Blackbird’ durum wheat population
    (Taylor and Francis, 2021) Bokore, F.E.; Ruan, Y.; McCartney, C.A.; Knox, R.; Xiangyu Pei; Aboukhaddour, R.; Randhawa, H.S.; Ammar, K.; Meyer, B.; Cuthbert, R.; Berraies, S.; DePauw, R.M.; Fobert, P.
    Publication
  • Genome-wide association mapping of seedling and adult plant response to stem rust in a durum wheat panel
    (Wiley, 2021) Megerssa, S.H.; Sorrells, M.E.; Ammar, K.; Acevedo, M.; Bergstrom, G.; Olivera Firpo, P.D.; Brown-Guedira, G.; Ward, B.; Degete, A.G.; Abeyo Bekele Geleta
    Publication
  • Quantitative inheritance of resistance to Septoria Tritici Blotch in durum wheat in Tunisia
    (INIA, 2014) Berraies, S.; Ammar, K.; Gharbi, M.S.; Yahyaoui, A.; Rezgui, S.
    Publication
  • Mapping of genetic loci conferring resistance to leaf rust from three globally resistant durum wheat sources
    (Frontiers, 2019) Kthiri, D.; Loladze, A.; N’Diaye, A.; Nilsen, K.; Walkowiak, S.; Dreisigacker, S.; Ammar, K.; Pozniak, C.
    Genetic resistance in the host plant is the most economical and environmentally friendly strategy for controlling wheat leaf rust, caused by Puccinia triticina Eriks. The durum wheat lines Gaza (Middle East), Arnacoris (France) and Saragolla (Italy) express high levels of resistance to the Mexican races of P. triticina. Three recombinant inbred line (RIL) populations, derived from crosses of each of these resistance sources to the susceptible line ATRED #2, were evaluated for leaf rust reactions at CIMMYT’s leaf rust nurseries in Mexico. Genetic analyses of host reactions suggested oligogenic control of resistance in all populations. The F8 RILs from each cross were genotyped using the Illumina iSelect 90K array, and high-density genetic maps were constructed for each population. Using composite interval mapping, a total of seven quantitative trait loci (QTL) that provide resistance to leaf rust were identified. Two QTL designated as QLr.usw-6BS and QLr.usw-6BL were identified on chromosome 6B in Gaza, which explained up to 78.5% and 21.3% of the observed leaf rust severity variance, respectively. A major QTL designated as QLr.usw-7BL was detected on the long arm of chromosome 7B in Arnacoris, which accounted for up to 65.9% of the disease severity variance. Arnacoris also carried a minor QTL on chromosome 1BL, designated as QLr.usw1BL.1 that explained up to 17.7% of the phenotypic variance. Three QTL conferred leaf rust resistance in Saragolla, namely QLr.usw-2BS, QLr.usw-3B, and QLr.usw-1BL.2, which accounted for up to 42.3, 9.4, and 7.1% of the phenotypic variance, respectively. Markers flanking each QTL were physically mapped against the durum wheat reference sequence and candidate genes involved in disease resistance were identified within the QTL intervals. The QTL identified in this study and their closely linked markers are useful resources for gene pyramiding and breeding for durable leaf rust resistance in durum wheat.
    Publication
  • Genetic Analysis of Leaf Rust Resistance in Six Durum Wheat Genotypes
    (American Phytopathological Society (APS), 2014) Loladze, A.; Kthiri, D.; Pozniak, C.; Ammar, K.
    Leaf rust, caused by Puccinia triticina, is one of the main fungal diseases limiting durum wheat production. This study aimed to characterize previously undescribed genes for leaf rust resistance in durum wheat. Six different resistant durum genotypes were crossed to two susceptible International Maize and Wheat Improvement Center (CIMMYT) lines and the resulting F1, F2, and F3 progenies were evaluated for leaf rust reactions in the field and under greenhouse conditions. In addition, allelism tests were conducted. The results of the study indicated that most genotypes carried single effective dominant or recessive seedling resistance genes; the only exception to this was genotype Gaza, which carried one adult plant and one seedling resistance gene. In addition, it was concluded that the resistance genes identified in the current study were neither allelic to LrCamayo or Lr61, nor were they related to Lr3 or Lr14a, the genes that already are either ineffective or are considered to be vulnerable for breeding purposes. A complicated allelic or linkage relationship between the identified genes is discussed. The results of the study will be useful for breeding for durable resistance by creating polygenic complexes.
    Publication
  • Genetic analysis of resistance to stripe rust in durum wheat (Triticum turgidum L. Var. Durum)
    (Public Library of Science, 2018) Xue Lin; N’Diaye, A.; Walkowiak, S.; Nilsen, K.; Cory, A.; Haile, J.; Kutcher, H.R.; Ammar, K.; Loladze, A.; Huerta-Espino, J.; Clarke, J.M.; Yanye Ruan; Knox, R.; Fobert, P.; Sharpe, A.G.; Pozniak, C.
    Stripe rust, caused by the fungal pathogen Puccinia striiformis Westend. f. sp. tritici Eriks, is an important disease of bread wheat (Triticum aestivum L.) worldwide and there is an indication that it may also become a serious disease of durum wheat (T. turgidum L. var. durum). Therefore, we investigated the genetic architecture underlying resistance to stripe rust in adapted durum wheat germplasm. Wheat infection assays were conducted under controlled conditions in Canada and under field conditions in Mexico. Disease assessments were performed on a population of 155 doubled haploid (DH) lines derived from the cross of Kofa (susceptible) and W9262-260D3 (moderately resistant) and on a breeding panel that consisted of 92 diverse cultivars and breeding lines. Both populations were genotyped using the 90K single-nucleotide polymorphism (SNP) iSelect assay. In the DH population, QTL for stripe rust resistance were identified on chromosome 7B (LOD 6.87?11.47) and chromosome 5B (LOD 3.88?9.17). The QTL for stripe rust resistance on chromosome 7B was supported in the breeding panel. Both QTL were anchored to the genome sequence of wild emmer wheat, which identified gene candidates involved in disease resistance. Exome capture sequencing identified variation in the candidate genes between Kofa and W9262-260D3. These genetic insights will be useful in durum breeding to enhance resistance to stripe rust.
    Publication