Leaf rust resistance of bread wheat (Triticum aestivum L.) lines derived from interspecific crosses

Abstract

Wheat lines which possess resistance to leaf rust were developed from the cultivar crosses between bread wheat (Triticum aestivum L.) and wild cereal species: jointed goatgrass (Aegilops cylindrica Host), tausch's goatgrass (Aegilops tauschii Coss.), wild emmer (Triticum dicoccoides Koern.) and synthetic species Triticum erebuni Gandil. Resistance of breeding lines was examined at the seedling stage of wheat plants after artificial inoculation. Resistance genes Lr21, Lr22a, Lr24 (T1BL.1BS-3Ae#1L), Lr32, Lr34, Lr39, Lr42, Lr53 and T1AL.1RS were identified by a molecular analysis using sequence-tagged sites (STS) and simple sequence repeats (SSR) markers. Comparison of data of phytopathological evaluation and molecular-genetic analysis of breeding lines revealed that leaf rust resistance was conferred by a combination of several genes. The combination of genes Lr24+Lr34+T1AL.1RS conferred resistance, Lr24+Lr34+Lr21, T1AL.1RS+Lr24 and Lr21+T1AL.1RS+Lr24 conferred resistance and moderate resistance.

Impact of Alien Genes on Disease Resistance, Drought Tolerance, and Agronomic Traits in Winter Wheat Commercial Varieties

“…In the history of wheat breeding, disease and droughtresistant germplasm, such as wheat-rye 1BL.1RS translocation, have made outstanding contributions [10,37]. Our work also shows the value of using derivatives of the line H74/90-245 for generating advanced introgression lines combining genes resistant to fungal pathogens localized in wheat-rye translocation 1BL.1RS with complexes of effective resistance genes from other sources.…”

“…Overall, introgression lines have been widely studied with regards to different valuable traits in Ukraine [11,30] and in the world [12,45]. These lines were used: (i) to study theoretical aspects of genome evolution, mapping genes, alien trait inheritance or stability in wheat background [9,10], [40,46]; and (ii) to diversify the genetic variability of wheat and increase the efficiency of breeding [13,37,47,48]. Hybridization with distant relatives contributed to the transfer of genes for disease resistance [7,22,48,50,51], pests tolerance [52], and adaptation to abiotic stress factors [11,12,53] of bread wheat.…”

“…It allows estimating adult plant response to mildew and septoria on the basis of the vertical progression of the pathogen [27] in reverse point order), and to rusts on the basis of the top leaves damage intensity (disease severity) [28]. The scale is adopted in Ukraine [6,11,28] from the former scales used in the USSR [10], COMECON [24], and some other countries [29]. This scale allows calculating the pathogen response in points using common statistical methods [24,30].…”

An analysis of the functionality of molecular markers related to the Lr19 gene conditioning resistance to wheat leaf rust

“…By 2013, 71 genes had been identified (Singh et al, 2013). The most effective genes are Lr19, Lr24, Lr26, Lr28, Lr34, Lr42, Lr46 and Lr67 (Gorash et al, 2014;Elangbam et al, 2018). The Lr19 is considered the most effective resistance gene, carrying immunity against most races of the pathogen in many regions of the world (Sehgal et al, 2012).…”

Characteristics of New Varieties of Winter Common Wheat Breeding of the Myronivka Institute of Wheat as the Allelic State of the Lr34 Leaf Rust Resistance Gene

“…Однак, на сьогодні наявність гену Lr34/Yr18/Pm38 у сортах, які вирощують на території України, не забезпечує високого рівня стійкості проти рас патогенів, що домінують [11,12,13]. Незважаючи на даний факт, дослідженнями доведено, що комбінація його з іншими расоспецифічними генами, такими як Lr13, Lr22a, Lr26, Lr35, Lr37 та ін., значно підвищує рівень польової стійкості [6,11,12,13].…”