Identification of a major dominant gene for race-nonspecific tan spot resistance in wild emmer wheat

Faris, Justin D.; Overlander, Megan; Kariyawasam, Gayan K.; Carter, Arron H.; Xu, Steven S.; Liu, Zhaohui

doi:10.1007/s00122-019-03509-8

Cited by 34 publications

(18 citation statements)

References 49 publications

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“…However, traits and loci related to Botrytis susceptibility remain unknown. This may be due to the fact that resistance to necrotrophic pathogens is often inherited as a recessive and quantitative trait ( Wolpert and Lorang, 2016 ; Kariyawasam et al, 2016 ; Liu et al, 2017 ; Koladia et al, 2017 ; Faris et al, 2020 ) and may have not been considered during the breeding selection.…”

Section: Discussionmentioning

confidence: 99%

Fire Blight Susceptibility in Lilium spp. Correlates to Sensitivity to Botrytis elliptica Secreted Cell Death Inducing Compounds

et al. 2021

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Fire blight represents a widespread disease in Lilium spp. and is caused by the necrotrophic Ascomycete Botrytis elliptica. There are >100 Lilium species that fall into distinct phylogenetic groups and these have been used to generate the contemporary commercial genotypes. It is known among lily breeders and growers that different groups of lilies differ in susceptibility to fire blight, but the genetic basis and mechanisms of susceptibility to fire blight are unresolved. The aim of this study was to quantify differences in fire blight susceptibility between plant genotypes and differences in virulence between fungal isolates. To this end we inoculated, in four biological replicates over 2 years, a set of 12 B. elliptica isolates on a panel of 18 lily genotypes representing seven Lilium hybrid groups. A wide spectrum of variation in symptom severity was observed in different isolate-genotype combinations. There was a good correlation between the lesion diameters on leaves and flowers of the Lilium genotypes, although the flowers generally showed faster expanding lesions. It was earlier postulated that B. elliptica pathogenicity on lily is conferred by secreted proteins that induce programmed cell death in lily cells. We selected two aggressive isolates and one mild isolate and collected culture filtrate (CF) samples to compare the cell death inducing activity of their secreted compounds in lily. After leaf infiltration of the CFs, variation was observed in cell death responses between the diverse lilies. The severity of cell death responses upon infiltration of the fungal CF observed among the diverse Lilium hybrid groups correlated well to their fire blight susceptibility. These results support the hypothesis that susceptibility to fire blight in lily is mediated by their sensitivity to B. elliptica effector proteins in a quantitative manner. Cell death-inducing proteins may provide an attractive tool to predict fire blight susceptibility in lily breeding programs.

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Section: Discussionmentioning

confidence: 99%

Fire Blight Susceptibility in Lilium spp. Correlates to Sensitivity to Botrytis elliptica Secreted Cell Death Inducing Compounds

et al. 2021

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“…dicoccoides) disomic chromosome substitution lines. Durum cultivar Langdon, which is susceptible to tan spot became resistant with the substitution of chromosome 3B from the wild emmer accession IsraelA (Faris et al 2020). Tsr7 locus in tetraploid wheat was later found to be the same as the race-nonspeci c QTL previously identi ed in the hexaploid wheat cultivars BR34 and Penawawa.…”

Section: Genetics Of Sensitivitymentioning

confidence: 99%

“…Tsr7 locus in tetraploid wheat was later found to be the same as the race-nonspeci c QTL previously identi ed in the hexaploid wheat cultivars BR34 and Penawawa. Four user-friendly SNP-based semithermal asymmetric reverse PCR (STARP) markers co-segregated with Tsr7 and should be useful for MAS (Faris et al 2020).…”

Section: Genetics Of Sensitivitymentioning

confidence: 99%

Sensitivity genes in wheat and corresponding effector genes in necrotrophs exhibiting inverse gene-for-gene relationship

Gupta¹,

Vasistha

Singh

2021

Preprint

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In wheat, genes for resistance (R) as well as susceptibility (S) are now known for several diseases. The S genes also include sensitivity genes like Tsn1 in wheat. R genes follow a gene-for-gene (GFG) relationship and generally involve biotrophs and S genes particularly sensitivity genes, follow an inverse gene-for-gene relationship (IGFG), generally involving necrotroph or hemi-biotroph pathogens. The toxin (virulence factor) genes of the pathogen and the corresponding sensitivity genes have been described in some detail for the following three pathogens: (i) Paratagonospora nodorum (causing Septoria nodorum blotch or SNB); (ii) Pyrenophora tritici-repentis (tan spot) and (iii) Bipolaris sorokiniana (spot blotch). These and some other pathogens produce several necrotrophic effectors (NEs), which interact directly or indirectly with the products of S genes in the host and produce disease symptoms like necrosis and/or chlorosis. In this article we present a critical review of all the relevant information about the interactions between NEs of the above three pathogens and the corresponding S genes in wheat. The gaps in knowledge and possibilities for future research are also discussed.

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“…In Canada, race 1 and 2 are predominant although race 3 is also reported (MacLean et al 2017). As the presence of races of this fungus is a problem in wheatgrowing areas, identification of genes to employ a general or race-nonspecific resistance to tan spot in wheat has been emphasized (Faris et al 2020). Significant research has been accomplished on the identification of quantitative trait loci conferring resistance to tan spot in wheat (Kariyawasam et al 2018;Singh et al 2019;Kokhmetova et al 2020;Phuke et al 2020).…”

Section: Introductionmentioning

confidence: 99%

Races, disease symptoms and genetic variability in Pyrenophora tritici-repentis isolates from Oklahoma that cause tan spot of winter wheat

Kader

Hunger

Sreedharan

et al. 2021

CEREAL RESEARCH COMMUNICATIONS

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In recent years, tan spot of wheat caused by the fungus Pyrenophora tritici-repentis has become more prevalent in Oklahoma. Experiments were conducted to investigate the race structure, disease symptoms and genetic variability in P. tritici-repentis isolates collected from winter wheat over three decades. Race determination was conducted for 16 isolates based on expression of necrosis and/or chlorosis produced on wheat differentials. Variability in disease symptoms expressed by 12 isolates was determined on 13 hard red winter wheat cultivars grown in Oklahoma. In addition, genetic variability among 17 isolates was determined using amplified fragment length polymorphism-polymerase chain reaction (AFLP-PCR). All isolates except one (El Reno) were classified as race 1. Isolates varied widely in producing necrosis and/or chlorosis symptoms on wheat cultivars, but necrosis with a chlorotic halo was predominant (56.4%). AFLP-PCR analysis using 13 primer pairs produced a total of 494 alleles of which 285 were polymorphic. The overall genetic diversity among the isolates was 25.2%. Genetic relationships based on cluster analysis and principal component analysis showed only minor differences between isolates, and isolates did not form tight clusters or groups. The isolates of P. tritici-repentis were predominantly race 1; however, they produced a range of tan spot symptoms on wheat cultivars. The lack of distinct genetic grouping by the AFLP marker study indicates that the isolates used in this study likely originated from a single lineage.

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Identification of a major dominant gene for race-nonspecific tan spot resistance in wild emmer wheat

Cited by 34 publications

References 49 publications

Fire Blight Susceptibility in Lilium spp. Correlates to Sensitivity to Botrytis elliptica Secreted Cell Death Inducing Compounds

Fire Blight Susceptibility in Lilium spp. Correlates to Sensitivity to Botrytis elliptica Secreted Cell Death Inducing Compounds

Sensitivity genes in wheat and corresponding effector genes in necrotrophs exhibiting inverse gene-for-gene relationship

Races, disease symptoms and genetic variability in Pyrenophora tritici-repentis isolates from Oklahoma that cause tan spot of winter wheat

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