Genetics and molecular mapping of resistance to necrosis inducing race 5 of Pyrenophora tritici-repentis in tetraploid wheat

Singh, Pawan K.; Mohamed, Maryati; Gonzalez-Hernandez, Jose L.; Ali, Shaukat; Adhikari, Tika B.; Kianian, S. F.; Elias, E. M.; Hughes, G. R.

doi:10.1007/s11032-007-9129-3

Cited by 39 publications

(44 citation statements)

References 45 publications

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“…Races 3 and 5 and their combinations induce chlorosis in hexaploid wheat and necrosis in tetraploid wheat Singh et al 2008d). Hence, the present set of differential cultivars fails to fully reveal the virulence of P. tritici-repentis isolates.…”

Section: Pathogenic Variabilitymentioning

confidence: 99%

Genetics of wheat–Pyrenophora tritici-repentis interactions

Singh

Duveiller

et al. 2009

Euphytica

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Tan spot, caused by an ascomycete fungus Pyrenophora tritici-repentis, is one of the most devastating foliar diseases of wheat. This fungus induces two distinct symptoms, tan necrosis and extensive chlorosis, on susceptible wheat cultivars. Besides causing average yield losses of 5-10%, tan spot also causes significant losses in grain quality by grain shriveling, red smudge, and black point. Conservation agriculture in combination with wheat monoculture involving cultivation of susceptible cultivars has resulted in frequent onset of tan spot epidemics worldwide. Development of new resistant wheat cultivars, in conjunction with crop rotation, will provide an effective, economical, and environmentally safe means of controlling tan spot. Presently, eight races of P. tritici-repentis have been identified worldwide based on the ability to induce necrosis and chlorosis symptoms on a set of differential wheat cultivars. P. tritici-repentis is a homothallic fungus having both sexual and asexual reproduction resulting in high genetic diversity worldwide. Both quantitative and qualitative mode of inheritance for resistance to tan spot of wheat has been reported. The tan spot fungus produces multiple host-specific toxins and host resistance is highly correlated to insensitivity to toxins. Genetic studies have further confirmed that wheat-P. tritici-repentis follows the toxin model of gene-for-gene hypothesis although other mechanism of host-pathogen interaction may exist and exploitation of all resistance phenomenon is to be adopted to develop durable resistant cultivars.

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Section: Pathogenic Variabilitymentioning

confidence: 99%

Genetics of wheat–Pyrenophora tritici-repentis interactions

Singh

Duveiller

et al. 2009

Euphytica

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“…In addition, tsr3 (tsn3) on chromosome 3D (Tadesse et al 2006a(Tadesse et al , 2007, tsr4 (tsn4) on 3A (Tadesse et al 2006b), tsn5 on 3B (Singh et al 2008) were located. Furthermore, the genes tsn-syn1 and Tsn-syn2 on chromosome 3D (Tadesse et al 2006a) have also been mapped.…”

Section: Simón Et Al: Resistance To Pyrenophora Tritici-repentismentioning

confidence: 99%

“…Several recessive allele as tsr1 (tsn1) conferring resistance against Ptr ToxA have been located at the chromosome arm 5BL associated with resistance to necrosis caused by race 1 or 2 in both tetraploid and hexaploid wheat (Anderson et al 1999;Faris et al 1996), while tsr2 (tsn2), mapping to chromosome 3BL, confers resistance to race 3 which causes chlorosis in hexaploid wheat but necrosis in tetraploid wheat (Singh et al 2006). In addition, tsr3 (tsn3) on chromosome 3D (Tadesse et al 2006a(Tadesse et al , 2007, tsr4 (tsn4) on 3A (Tadesse et al 2006b), tsn5 on 3B (Singh et al 2008) were located.…”

Section: Simón Et Al: Resistance To Pyrenophora Tritici-repentismentioning

confidence: 99%

Mapping QTL for resistance againstPyrenophora tritici-repentisin wheat

Simón¹,

Ayala²,

Moreno³

et al. 2015

Cereal Research Communications

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Tan spot, caused by the fungus Pyrenophora tritici-repentis (Died.) Drechs is an important foliar disease of wheat (Triticum aestivum L.). From a set of phenotypically and molecularly characterized set of Argentinean isolates, two isolates H0019 and H0120 which do not correspond to known races of the pathogen were selected. Segregation for resistance among a set of recombinant inbred lines bred from the cross 'W7984' × cv. 'Opata 85' was used to identify the basis for resistance at the seedling stage, against those fungal isolates (H0019 and H0120), across three independent environments. On the basis of the mean performance across all three environments, a QTL against chlorosis located on the 6AS and linked to the RFLP locus Xksuh4c was significant for both isolates (with a LOD of 3.76 for isolate H0019 and 5.87 for H0120).

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“…Various host-pathogen interaction studies on tan spot of wheat have reported resistance to be inherited quantitatively (Faris et al 1997;Friesen & Faris 2004;Faris & Friesen 2005;Chu et al 2008;Singh et al 2008b) or qualitatively (Lamari & Bernier 1989b;Anderson et al 1999;Singh et al 2006aSingh et al , 2008aTadesse et al 2007). Major genes for resistance to tan spot have been reported on chromosomes 1AS, 3A, 2BS, 3BL, 5BL, and 3DS (Lamari & Bernier 1989b;Anderson et al 1999;Effertz et al 2002;Singh et al 2006aSingh et al , 2008aTadesse et al 2007;Singh et al 2010).…”

Section: S103mentioning

confidence: 99%

“…Major genes for resistance to tan spot have been reported on chromosomes 1AS, 3A, 2BS, 3BL, 5BL, and 3DS (Lamari & Bernier 1989b;Anderson et al 1999;Effertz et al 2002;Singh et al 2006aSingh et al , 2008aTadesse et al 2007;Singh et al 2010). Additional quantitative trait loci (QTLs) have been located on chromosomes 2AS, 3AS, 4AL, 5AL, 1BS, 2BL, 3BS, 3BL, 2DS, 2DL, and 7DS (Faris et al 1997;Friesen & Faris 2004;Faris & Friesen 2005;Chu et al 2008;Singh et al 2008b;Singh et al 2010).…”

Section: S103mentioning

confidence: 99%

Evaluation of CIMMYT germplasm for resistance to leaf spotting diseases of wheat

Singh¹,

Duveiller²,

Singh³

2011

CZECH J GENET PLANT

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Abstract:The leaf spotting disease complex is a major biotic constrain in enhancing grain production in the major wheat growing regions. Two leaf spotting diseases, tan spot, caused by an ascomycete fungus Pyrenophora tritici-repentis, and Stagonospora nodorum blotch besides causing average yield losses of 5-10%, cause significant losses in grain quality by red smudge, black point and grain shriveling. Conservation agriculture in combination with wheat monoculture involving cultivation of susceptible cultivars has resulted in frequent onset of leaf spots epidemics worldwide. Development of resistant wheat cultivars, in conjunction with crop rotation, will provide an effective, economical, and environmentally safe means of controlling leaf spot. International Maize and Wheat Improvement Center (CIMMYT), Mexico has initiated major efforts to mitigate the threat of tan spot. Efforts include screening of wheat germplasm, identification of new sources of resistance, characterization of new tan spot resistance genes through classical and molecular genetic analysis, incorporation of resistance into adapted cultivars, and assessing the variability in the tan spot fungus. Screening studies reveal that elite CIMMYT germplasm has high level of resistance to tan spot caused by P. tritici-repentis race 1. These germplasm have diverse genetic make-up and the resistance is likely broad based. Association mapping studies done with CIMMYT germplasm reconfirmed the presence of previously identified genomic regions for tan spot resistance; however, novel genomic regions on long arm of chromosomes 6A and 7B have also been identified. Studies done to date indicate that CIMMYT germplasm possess high level diverse genetic based resistance to tan spot of wheat. Efforts are in place to develop desired wheat cultivars with tan spot resistance. Virulence studies indicate presence of P. tritici-repentis race 1 only with some variability in level of toxin Ptr ToxA produced in each of the 76 isolates studied.

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Genetics and molecular mapping of resistance to necrosis inducing race 5 of Pyrenophora tritici-repentis in tetraploid wheat

Cited by 39 publications

References 45 publications

Genetics of wheat–Pyrenophora tritici-repentis interactions

Genetics of wheat–Pyrenophora tritici-repentis interactions

Mapping QTL for resistance againstPyrenophora tritici-repentisin wheat

Evaluation of CIMMYT germplasm for resistance to leaf spotting diseases of wheat

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