Histopathology and PR-protein markers provide insight into adult plant resistance to stripe rust of wheat.

@article{Moldenhauer2008HistopathologyAP,
  title={Histopathology and PR-protein markers provide insight into adult plant resistance to stripe rust of wheat.},
  author={J. Moldenhauer and Z. Pretorius and B. Moerschbacher and R. Prins and A. J. van der Westhuizen},
  journal={Molecular plant pathology},
  year={2008},
  volume={9 2},
  pages={
          137-45
        }
}
Stripe rust, caused by Puccinia striiformis f. sp. tritici, is a serious disease of wheat. The spring wheat cultivar Kariega expresses complete adult plant resistance to stripe rust, whereas Avocet S is susceptible. In former studies, quantitative trait loci (QTL) analysis of doubled haploid lines derived from a Kariega x Avocet S cross revealed two major QTL (QYr.sgi-7D and QYr.sgi-2B.1) and two minor QTL (QYr.sgi-1A and QYr.sgi-4A.1) responsible for the adult resistance of Kariega in the… Expand
QTL mapping of stripe, leaf and stem rust resistance genes in a Kariega × Avocet S doubled haploid wheat population
TLDR
Adult plant resistance to stripe (yellow) rust in the wheat cultivar Kariega has previously been ascribed to a major quantitative trait locus (QTL) on each of chromosomes 2B and 7D, along with a number of minor QTL, but this work extends both the size and the marker coverage within the Avocet S mapping population. Expand
Histopathology of rust infection in wheat and barley
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Besides the confirmation of enhanced resistance of co-occurring resistance loci, the choice of QTL was accentuated in the varying levels of defence conditioned by different QTL combinations, and significant variation found among lines across parameters. Expand
Histopathology provides a phenotype by which to characterize stripe rust resistance genes in wheat
TLDR
Cell death associated with infection sites was observed for all genotypes, although the timing of first appearance and the extent of the cell death response varied considerably, and in lines carrying both QPst.jic-2D and QPST.jIC-4B cell death did not extend beyond one to three cells. Expand
QTL identification and microphenotype characterisation of the developmentally regulated yellow rust resistance in the UK wheat cultivar Guardian
TLDR
While the adult plant resistance in Guardian did not prevent germinated urediniospores from establishing an effective infection site, the growth of hyphae within flag leaf tissue was significantly inhibited, slowing the development of microcolonies. Expand
Phenotyping Kariega × Avocet S doubled haploid lines containing individual and combined adult plant stripe rust resistance loci
TLDR
Doubled haploid mapping population (MP) lines derived from a Kariega 9 Avocet S cross, carrying consistently detected adult plant resistance (APR) quantitative trait loci (QTLs)/gene combinations, were phenotyped at macroscopic and microscopic levels and revealed mechanisms of resistance in some lines. Expand
Genetic characterisation and fine mapping of sources of durable resistance to stripe rust in selected wheat genotypes
TLDR
Improved characterisation of the QTL has led to the identification of QTL-associated markers, allowing for more efficient selection in marker-assisted breeding schemes, and it also paves the way for map-based cloning. Expand
Genetic analysis of wheat rust resistance genes segregating in a Kariega x Avocet S population
TLDR
Several leaf rust resistance genes and QTL for adult plant resistance to stripe rust in wheat have been detected in the mapping population using an adult plant screening method and different pathotypes of Puccinia triticina. Expand
High-resolution mapping and new marker development for adult plant stripe rust resistance QTL in the wheat cultivar Kariega
TLDR
The development of expressed sequence tag (EST)-derived markers as an effective strategy for increasing the marker density in the selected QTL intervals and the conversion of Diversity Arrays Technology (DArT) and EST-derived markers to sequence tagged site (STS) markers to enable high-throughput screening are described. Expand
Genes involved in adult plant resistance to stripe rust in wheat cultivar Xingzi 9104
TLDR
This study is the first to report a concanavalin A-like lectin/glucanase involved in plant defense against pathogen infection, and it is found that some PR protein genes kept high expression levels longer in the adult plants than in seedlings after Pst infection. Expand
Histopathology of durable adult plant resistance to leaf rust in the Brazilian wheat variety Toropi
TLDR
This work investigates the histological components of resistance to P. triticina present in three wheat genotypes, finding different resistance mechanisms active at different times during the infection process, which may be responsible for maintaining the low disease severity observed in this variety even under high inoculum pressure. Expand
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Analysis of field data for adult plant stripe rust resistance identified two major and two minor QTLs in the resistant cultivar Kariega, and the results of the QTL analysis demonstrate its higher resolution power compared to the mixture model analysis by detecting the presence of minorQTLs. Expand
Powdery mildew resistance and Lr34/Yr18 genes for durable resistance to leaf and stripe rust cosegregate at a locus on the short arm of chromosome 7D of wheat
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This chromosomal region in wheat has now been linked with resistance to five different pathogens, including enhanced stem rust resistance and tolerance to barley yellow dwarf virus infection. Expand
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Studying on the spread of stripe rust from infection foci established in selected cultivars in the field indicated that the resistance detected at early growth stages in Suneca in controlled environmental studies also appeared to be effective inThe field. Expand
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It is argued that Lr34 should be considered a major gene conferring partial resistance sensu Parlevliet, based on reduced rates of haustorium formation in the early stages of infection, in association with no or relatively little plant cell necrosis. Expand
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TLDR
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TLDR
Studies of F 2 and F 3 populations from crosses with the susceptible 'Avocet' indicated that intermediate levels of adult plant stripe rust resistance in cultivars 'Harrier', 'Flinders' and 'M2435' were inherited monogenically, whereas King possessed two genes for resistance. Expand
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TLDR
Evidence is provided that the accumulation of lignin or lign in-like material is associated with the hypersensitive reaction conditioned by the Sr5 gene, and in vivo application of the competitive inhibitor of phenylalanine ammonia-lyase inhibited the hyperssensitive reaction and markedly altered resistance expression. Expand
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