Quantitative resistance to barley leaf stripe (Pyrenophora graminea) is dominated by one major locus

Pecchioni, Nicola; Faccioli, P.; Toubia-Rahme, H.; Val�, G.; Terzi, V.

doi:10.1007/s001220050253

Cited by 16 publications

(20 citation statements)

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“…Cultivars quantitatively resistant to leaf stripe have been commonly found in spring barleys (Skou et al 1994). A major QTL effect accounting for more than half the variation in the trait and controlling the partial resistance of the tworowed spring barley 'Proctor' to Dg2, a highly virulent P. graminea isolate, was mapped to the centromere of chromosome 1 (7H) and proposed as 'Proctor resistance', by analogy to 'Vada resistance' (Pecchioni et al 1996). Also mapped in the same, or tightly linked, position in the barley genome (Qi et al 1996) were the RsmMx qualitative resistance gene for BSMV (Barley Stripe Mosaic Virus), another seed-borne disease of barley (Edwards and Steffenson 1996), and the Rpt4 gene for resistance to the spot form of Pyrenophora teres (Williams et al 1999).…”

Section: Introductionmentioning

confidence: 99%

“…graminea interaction. However, while a number of studies have mapped several QTLs responsible for quantitative resistance to pathogens in barley (Pecchioni et al 1996;Toojinda et al 1998;de la Pena et al 1999;Arru et al 2002), they did not address the race-specificity question, and only recently have eight QTLs for resistance to two different isolates of barley leaf rust (Puccinia hordei) been found, three of them being effective in both isolates and five in only one (Qi et al 1999). This finding supports the suggestion of Parlevliet and Zadoks (1977) that partial resistance may be due to minor gene-for-minor-gene interactions but is at odds with Van der Plank (1968), i.e.…”

Section: Introductionmentioning

confidence: 99%

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Isolate-specific QTLs of resistance to leaf stripe (Pyrenophora graminea) in the 'Steptoe' × 'Morex' spring barley cross

2003

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Leaf stripe caused by the fungus Pyrenophora graminea represents a serious threat to grain yield in organically grown barley and in conventional Nordic and Mediterranean districts, for which resistant cultivars are necessary. A medium-density, molecular marker map derived from a 'Steptoe' (partially resistant) x 'Morex' (susceptible) spring barley cross and its derived doubled-haploid mapping population inoculated with the fungus made it possible to identify QTLs of resistance to leaf stripe. In order to investigate isolate-specificity of partial resistance, the 'Steptoe' x 'Morex' segregating population was inoculated with two highly virulent P. graminea isolates, Dg2 and Dg5. The present study demonstrates that partial resistance to leaf stripe of cv 'Steptoe' is governed in part by shared loci and in part by isolate-specific ones. One QTL is common to the resistance for the two isolates, on the long arm of chromosome 2 (2H), two QTLs are linked on chromosome 3 (3H), and the remaining two are isolate-specific, respectively for isolate Dg2 on chromosome 2 (2H) and for isolate Dg5 on chromosome 7 (5H). The QTL in common is that with the major effect on the resistance for each isolate, explaining 18.3% and 30.9% R(2) respectively for Dg2 and Dg5. The isolate-specific QTLs mapped in the 'Steptoe' x 'Morex' barley reference map support the assumption of Parlevliet and Zadoks (1977) that partial resistance may be due to minor gene-for-minor-gene interactions. Map comparisons of the QTLs with the known qualitative resistance genes to leaf stripe, Rdg1 (2H) and Rdg2 (7H), as well as with other QTLs of partial resistance in barley, show that the QTL for resistance to both isolates mapped on the long arm of chromosome 2 (2H) does not coincide with the qualitative Rdg1 gene but is linked to it at about 30 cM. One isolate-specific QTL of resistance to P. graminea, mapped on the short arm of chromosome 2 (2H), is coincident with a QTL for resistance to Pyrenophora teres previously mapped in the 'Steptoe' x 'Morex' cross.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Isolate-specific QTLs of resistance to leaf stripe (Pyrenophora graminea) in the 'Steptoe' × 'Morex' spring barley cross

2003

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“…No associations with either smut or scald resistance, or with heading date, maturity and spike density were found by these authors. Three QTLs for pathogen resistance have been mapped in the nud region of barley: one for resistance to Pyrenophora graminea (Pecchioni et al 1996), one for non-host resistance to leaf rust fungi (Puccinia hordei-murini and Puccinia triticina) (Niks et al 2000), and one for non-host resistance to the rice pathogen Pyricularia grisea (Chen et al 2003). These latter associations seem to depend in most cases on genetic linkage rather than on pleiotropy.…”

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confidence: 99%

Effect of the nud gene on grain yield in barley

Barabaschi¹,

Francia²,

Tondelli³

et al. 2012

CZECH J GENET PLANT

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Naked barleys are less yielding than the hulled ones while the reason for this difference has not been definitely clarified. To investigate the effect of the nud gene on yield, a barley doubled haploid (DH, Proctor × Nudinka) population was initially tested in three environments and a QTL study was run on the entire population as well as on two nud/NUD DH subpopulations. Among the agronomic traits studied, a QTL effect was found at nud locus on chromosome 7H only for yield and thousand grain weight (TGW), while a second QTL was found on 6H, although contributed by the naked parent. Other QTLs for TGW were identified on 2H, 3H and 5H. Most QTLs found in the entire population were confirmed by the study on the two groups. No interaction was observed between QTLs. To provide a more accurate evaluation of the effects of the nud gene upon grain yield, its components and other agronomic traits, sixteen naked advanced backcross (AB) BC5F2 lines in the hulled background of cultivar Arda were prepared and evaluated in a replicated yield trial for two years. The only differences found between AB lines and Arda in grain yield and TGW were due to hull weight (11.97% of kernel weight). No differences were observed in other traits such as grains/m 2 , grains per spike, plant height, heading date and mildew resistance. In conclusion, we think to have clarified that the effect of the nud gene on yield is due to hulls, and we did not find any pleiotropic effect of nud on other traits. This suggests, together with the finding of a QTL contributed by the naked parent, that there is a great potential to improve naked barley up to the yield levels of hulled barley.

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“…Pt.a/ Rpt1 and Rpt2c on chromosome 3H, have been reported (Schaller 1955;Mode and Schaller 1958;Khan and Boyd 1969a;Bockelman et al 1977;Wilcoxson et al 1992;. On chromosome 2HS, a QTL for resistance to net blotch of adult plants has been described (Pecchioni et al 1996;Steffenson et al 1996). Other qualitative genes for disease resistance including Ryd2 for resistance to barley yellow dwarf virus (Collins et al 1996), Rhy, Rh, and Rrs for scald resistance Graner et al 2000;Genger et al 2003, this issue), and rym 4, rym5, and rym11 for virus resistance to strains of BaMMV and BaYMV (Graner and Bauer 1993;Bauer et al 1997;Graner et al 1999), also mapped close to Pt.a/Pt.1 gene for net blotch resistance on the proximal region of 3HL.…”

Section: Discussionmentioning

confidence: 99%

Mapping of genomic regions associated with net form of netblotch resistance in barley

Raman¹,

Platz²,

Chalmers³

et al. 2003

Aust. J. Agric. Res.

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Abstract. Quantitative trait loci (QTLs) associated with resistance to net blotch and their chromosomal locations were determined from analyses of doubled haploid progeny of Alexis/Sloop, Arapiles/Franklin, Sloop/Halcyon, and recombinant inbred lines of Sloop-sib/Alexis. Five QTLs on chromosomes 2H, 3H, and 4H were found to be associated with seedling resistance to the net form of net blotch. In Arapiles/Franklin and Alexis/Sloop populations, 4 significant QTLs explaining 9-17% of the variation in net blotch resistance were detected on 2H and 3H. A major locus, QRpts4L accounting for 64% of the variation in infection type, was detected on 4H in the Sloop/Halcyon population. In Sloop/Halcyon, 2 microsatellite markers, EBmac0906 and GMS089, and AFLP marker P13/M50-108, co-segregated and detected maximum variability for net blotch resistance as revealed by bootstrap analysis. EBmac0906 and Bmac0181 were validated in F 2 progeny of an Ant29/Halcyon population and reliably predicted phenotypes of 93% of lines resistant and susceptible to net blotch. These markers may be used within breeding programs to select alleles favourable for net blotch resistance derived from Halcyon.A R 0 3 0 2 6 M a p p i n g n e t b l o t c h r e s i s t a n c e H . R a m a n e t a l .

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Quantitative resistance to barley leaf stripe (Pyrenophora graminea) is dominated by one major locus

Cited by 16 publications

References 0 publications

Isolate-specific QTLs of resistance to leaf stripe (Pyrenophora graminea) in the 'Steptoe' × 'Morex' spring barley cross

Isolate-specific QTLs of resistance to leaf stripe (Pyrenophora graminea) in the 'Steptoe' × 'Morex' spring barley cross

Effect of the nud gene on grain yield in barley

Mapping of genomic regions associated with net form of netblotch resistance in barley

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