INHERITANCE IN HEXAPLOID WHEAT OF ADULT-PLANT LEAF RUST RESISTANCE DERIVED FROM AEGILOPS SQUARROSA

1970 ◽  
Vol 12 (1) ◽  
pp. 175-180 ◽  
Author(s):  
P. L. Dyck ◽  
E. R. Kerber
Keyword(s):  
Leaf Rust ◽  
Hexaploid Wheat ◽  
Rust Resistance ◽  
Dominant Gene ◽  
Leaf Rust Resistance ◽  
Synthetic Hexaploid Wheat ◽  
Adult Plant ◽  
Plant Leaf ◽  
Aegilops Squarrosa ◽  
New Gene

The inheritance of adult-plant leaf rust resistance derived from Aegilops squarrosa was studied in a synthetic hexaploid wheat. The hexaploid was produced by combining the AABB component extracted from the common wheat cultivar Canthatch with Ae. squarrosa var. strangulata R.L. 5271 which has adult-plant resistance to several races of leaf rust. Resistance is conferred by a single, partially dominant gene that is inherited independently of Lr12 and L13, two previously identified genes for adult-plant leaf rust resistance. Although monogenic inheritance was observed, this gene must be influenced by the genetic background since its level of resistance was somewhat reduced during successive backcrosses to Thatcher.This new gene for adult-plant leaf rust resistance was linked with each of the genes for foliage waxiness and threshability with a recombination value of 15.6 ± 2.5% and 6.0 ± 1.5%, respectively. The genes for foliage waxiness and threshability were associated with an estimated linkage value of 17.4 ± 2.5%.

INHERITANCE IN HEXAPLOID WHEAT OF LEAF RUST RESISTANCE AND OTHER CHARACTERS DERIVED FROM AEGILOPS SQUARROSA

1969 ◽  
Vol 11 (3) ◽  
pp. 639-647 ◽  
Author(s):  
E. R. Kerber ◽  
P. L. Dyck
Keyword(s):  
Leaf Rust ◽  
Hexaploid Wheat ◽  
Rust Resistance ◽  
Dominant Gene ◽  
Leaf Rust Resistance ◽  
Synthetic Hexaploid Wheat ◽  
A Genome ◽  
Aegilops Squarrosa ◽  
Synthetic Hexaploid ◽  
Free Threshing

The inheritance of seedling leaf rust resistance and several morphological characters derived from Aegilops squarrosa (2n = 14 = DD) was investigated in a synthetic hexaploid wheat. The hexaploid was obtained by combining the tetraploid component (2n = 28 = AABB) extracted from the common wheat cultivar Canthatch with Ae. squarrosa var. meyeri R.L. 5289.A major, partially dominant gene was identified that gives good resistance (type 0;1 reaction) to leaf rust races 1, 5, 9, 11, 15, 30, 58 and 126a. This gene was shown to be different from the resistance genes Lr1, Lr2, Lr3, Lr10, Lr16, Lr17 and Lr18. A minor second gene was also detected which gives resistance (type 2 reaction) to race 9 and slight resistance to some of the other races.Each of the characters purple coleoptile, non-waxy foliage, brown glumes, and non-free threshing (tenacious glumes) of the synthetic wheat was monogenically inherited. The gene for threshability may be different from other genetic systems known to affect this character. The gene for brown glumes was linked with the major gene for leaf rust resistance with a recombination value of 3.1 ± 1.1%. The genes for non-waxy foliage and non-free threshing were associated with an estimated linkage value of 15.1 ± 2.6%.The results effectively demonstrated the relative ease with which genetic variation may be incorporated into common hexaploid wheat from its ancestral diploid, Ae. squarrosa, by means of a synthetic hexaploid intermediary. The method avoids the difficulties and complications often encountered with the transfer of genes from more distantly related species which do not have a genome in common with T. aestivum.

TELOCENTRIC MAPPING IN HEXAPLOID WHEAT OF GENES FOR LEAF RUST RESISTANCE AND OTHER CHARACTERS DERIVED FROM AEGILOPS SQUARROSA

1974 ◽  
Vol 16 (1) ◽  
pp. 137-144 ◽  
Author(s):  
G. G. Rowland ◽  
E. R. Kerber
Keyword(s):  
Leaf Rust ◽  
Hexaploid Wheat ◽  
Rust Resistance ◽  
Leaf Rust Resistance ◽  
Synthetic Hexaploid Wheat ◽  
Adult Plant ◽  
Aegilops Squarrosa ◽  
Chromosome Arm ◽  
Synthetic Hexaploid ◽  
Telocentric Mapping

Telocentrics of hexaploid wheat, Triticum aestivum spp. vulgare cv. Chinese Spring, were used to establish the chromosome arm location and crossover distance from the centromere of genes controlling characters introduced into synthetic hexaploid wheat (2n = 42 = AABBDD) from Aegilops squarrosa (2n = 14 = DD). The chromosome arm location and the crossover distance from the centromere of each gene studied are as follows: synthetic hexaploid RL 5404 — brown glumes (Rg2), 1DL, 13.3 ± 3.3%; tenacious glumes (Tg), 2Dα, 39.4 ± 4.9%; inhibitor of waxy foliage (W21), 2Dα, 52.5 ± 5.0%; adult-plant leaf rust resistance (Lr22), 2Dα, 63.6 ± 4.8%; purple coleoptile (Rc3), 7DS, 10.3 ± 2.8%; synthetic hexaploid RL 5406 — Rg2, 1DL, 1.7 ± 1.0%; Tg, 2Dα, 42.9 ± 4.6%; W21, 2Dα, 58.9 ± 4.6%; Rc3, 7DS, 9.8 ± 2.8%. A gene for seedling leaf rust resistance (Lr21) found in RL 5406 is located on chromosome 1D.

Transfer to hexaploid wheat of linked genes for adult-plant leaf rust and seedling stem rust resistance from an amphiploid of Aegilops speltoides × Triticum monococcum

Genome ◽  
1990 ◽  
Vol 33 (4) ◽  
pp. 530-537 ◽  
Author(s):  
E. R. Kerber ◽  
P. L. Dyck
Keyword(s):  
Leaf Rust ◽  
Resistance Genes ◽  
Stem Rust ◽  
Rust Resistance ◽  
Dominant Gene ◽  
Leaf Rust Resistance ◽  
Stem Rust Resistance ◽  
Adult Plant ◽  
Aegilops Speltoides ◽  
Plant Leaf

A partially dominant gene for adult-plant leaf rust resistance together with a linked, partially dominant gene for stem rust resistance were transferred to the hexaploid wheat cultivar 'Marquis' from an amphiploid of Aegilops speltoides × Triticum monococcum by direct crossing and backcrossing. Pathological evidence indicated that the alien resistance genes were derived from Ae. speltoides. Differential transmission of the resistance genes through the male gametes occurred in hexaploid hybrids involving the resistant 'Marquis' stock and resulted in distorted segregation ratios. In heterozygotes, pairing between the chromosome arm with the alien segment and the corresponding arm of the normal wheat chromosome was greatly reduced. The apparent close linkage between the two resistance genes, 3 ± 1.07 crossover units, was misleading because of this decrease in pairing in the presence of the 5B diploidizing mechanism. The newly identified gene for adult-plant leaf rust resistance, located on chromosome 2B, is different from adult-plant resistance genes Lr12, Lr13, and Lr22 and from that in the hexaploid accession PI250413; it has been designated Lr35. It is not known whether the newly transferred gene for stem rust resistance differs from Sr32, also derived from Ae. speltoides and located on chromosomes 2B.Key words: hexaploid, Triticum, Aegilops, aneuploid, Puccinia graminis, Puccinia recondita.

IDENTIFICATION OF THE GENE FOR ADULT-PLANT LEAF RUST RESISTANCE IN THATCHER

1979 ◽  
Vol 59 (2) ◽  
pp. 499-501 ◽  
Author(s):  
P. L. DYCK
Keyword(s):  
Leaf Rust ◽  
Rust Resistance ◽  
Adult Plant Resistance ◽  
Wheat Cultivar ◽  
Leaf Rust Resistance ◽  
Triticum Aestivum L ◽  
Adult Plant ◽  
Plant Leaf ◽  
Aegilops Squarrosa ◽  
The Common

The gene for adult-plant resistance to race 9 of leaf rust (Puccinia recondita Rob. ex. Desm.) in the common wheat cultivar Thatcher (Triticum aestivum L.) was allelic to Lr22a, a gene for adult-plant leaf rust resistance previously transferred to hexaploid wheat from Aegilops squarrosa L. This gene, designated Lr22b, was linked with Tg, a gene for tenacious glumes, and W21, an inhibitor of waxy foliage, both known to be on chromosome arm 2Dα and linked with Lr22a.

scholarly journals Genetic analysis of Aegilops tauschii-derived seedling resistance to leaf rust in synthetic hexaploid wheat

2019 ◽  
Author(s):  
Volker Mohler ◽  
Michael Schmolke ◽  
Friedrich J. Zeller ◽  
Sai L.K. Hsam
Keyword(s):  
Leaf Rust ◽  
Hexaploid Wheat ◽  
Rust Resistance ◽  
Dominant Gene ◽  
Leaf Rust Resistance ◽  
Synthetic Hexaploid Wheat ◽  
Specific Marker ◽  
Monosomic Analysis ◽  
Seedling Resistance ◽  
Synthetic Hexaploid

SummarySeedling resistance to leaf rust available in the synthetic hexaploid wheat line Syn137 was characterized by means of cytogenetic and linkage mapping. Monosomic analysis located a single dominant gene for leaf rust resistance on chromosome 5D. Molecular mapping not only confirmed this location but also positioned the gene to the distal part of the long arm of chromosome 5D. A test of allelism showed that the gene, tentatively named LrSyn137, is independent but closely linked to Lr1. It appears that Syn137 is occasionally heterogeneous for Lr1 since the analysis of the Lr1-specific marker RGA567-5 in the mapping population indicated the presence of Lr1. Syn137 represents another source of genetic variation that can be useful for the diversification of leaf rust resistance in wheat cultivars.

scholarly journals Mapping of Adult Plant Leaf Rust Resistance in Aus27506 and Validation of Underlying Loci by In-Planta Fungal Biomass Accumulation

Agronomy ◽  
2020 ◽  
Vol 10 (7) ◽  
pp. 943
Author(s):  
Pakeerathan Kandiah ◽  
Mumta Chhetri ◽  
Matthew Hayden ◽  
Michael Ayliffe ◽  
Harbans Bariana ◽  
...  
Keyword(s):  
Leaf Rust ◽  
Rust Resistance ◽  
Green Revolution ◽  
Puccinia Triticina ◽  
Biomass Accumulation ◽  
Leaf Rust Resistance ◽  
Adult Plant ◽  
In Planta ◽  
Plant Leaf ◽  
Ril Population

Among the rust diseases, leaf rust of wheat caused by Puccinia triticina, is the most prevalent worldwide and causes significant yield losses. This study aimed to determine the genomic location of loci that control adult plant resistance (APR) to leaf rust in the pre-Green Revolution landrace accession, Aus27506, from the “Watkins Collection”. An Aus27506/Aus27229-derived F7 recombinant inbred line (RIL) population was screened under field conditions across three cropping seasons and genotyped with the iSelect 90K Infinium SNP bead chip array. One quantitative trait loci (QTL) on each of the chromosomes 1BL, 2B and 2DL explained most of the leaf rust response variation in the RIL population, and these were named QLr.sun-1BL, QLr.sun-2B and QLr.sun-2DL, respectively. QLr.sun-1BL and QLr.sun-2DL were contributed by Aus27506. QLr.sun-1BL is likely Lr46, while QLr.sun-2DL appeared to be a new APR locus. The alternate parent, Aus27229, carried the putatively new APR locus QLr.sun-2B. The comparison of average severities among RILs carrying these QTL in different combinations indicated that QLr.sun-2B does not interact with either of the other two QTL; however, the combination of QLr.sun-1BL and QLr.sun-2DL reduced disease severity significantly. In planta fungal quantification assays validated these results. The RILs carrying QLr.sun-1BL and QLr.sun-2DL did not differ significantly from the parent Aus27506 in terms of resistance. Aus27506 can be used as a source of adult plant leaf rust resistance in breeding programs.

Fine mapping of LrSV2, a race-specific adult plant leaf rust resistance gene on wheat chromosome 3BS

2014 ◽  
Vol 127 (5) ◽  
pp. 1133-1141 ◽  
Author(s):  
M. J. Diéguez ◽  
M. F. Pergolesi ◽  
S. M. Velasquez ◽  
L. Ingala ◽  
M. López ◽  
...  
Keyword(s):  
Leaf Rust ◽  
Resistance Gene ◽  
Fine Mapping ◽  
Rust Resistance ◽  
Wheat Chromosome ◽  
Leaf Rust Resistance ◽  
Rust Resistance Gene ◽  
Adult Plant ◽  
Leaf Rust Resistance Gene ◽  
Plant Leaf
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