Pm34: a new powdery mildew resistance gene transferred from Aegilops tauschii Coss. to common wheat (Triticum aestivum L.)

Miranda, Lilian; Murphy, J. Paul; Marshall, David; Leath, S.

doi:10.1007/s00122-006-0397-9

Cited by 131 publications

(73 citation statements)

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“…The use of resistant cultivars is the most economical and environmentally safe means of controlling powdery mildew (Bennet 1984). To date, genes for powdery mildew resistance (Pm genes) have been described at 39 officially named and several temporarily designated gene loci in common wheat Lillemo et al 2008;McIntosh et al 2003;Miranda et al 2007Miranda et al , 2006Zhu et al 2005). Usually, these genes are detected by powdery mildew resistance tests on seedlings or on detached leaves of seedlings (Hsam and Zeller 2002) but are thought to confer resistance which is expressed throughout the life cycle of the host.…”

Section: Introductionmentioning

confidence: 99%

Estimation of genetic parameters and prediction of breeding values for apple fruit-quality traits using pedigreed plant material in Europe

Kouassi

Durel

Costa

et al. 2009

Tree Genetics & Genomes

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Powdery mildew (Blumeria graminis f. sp. tritici) is one of the major diseases of wheat (Triticum aestivum). Adult plant resistance (APR) to powdery mildew is considered more durable than resistance conferred by major race-specific resistance genes. The objective of the present study was a better understanding of the genetic basis of APR in RE714 by means of QTL analysis of several resistance scores along the growing season. A population of 160 recombinant inbred lines obtained from the cross between RE714 and Hardi (susceptible) was assessed for APR under natural infection conditions during 3 years and a genetic map with whole genome coverage was developed with microsatellite and AFLP markers in this population. Two major QTL on chromosomes 5D and 6A were detected each year, and 6 minor QTL were detected only in 1 or 2 years. The QTL on chromosome 5D was detected during all the growing season each year and its R 2 value varied between 8.5 and 56.3%, whereas the QTL on chromosome 6A was detected at 1-4 scoring dates in the 3 years, and its R 2 value varied between 6.1 and 20.5%. The two QTL explained between 24.4 and 52.1% of the phenotypic variance for AUDPC, depending on the year. The models including QTL and cofactors in the composite interval mapping explained between 29 and 72% of the variance. The molecular markers linked to the two major QTL could be used in marker-assisted selection for adult plant resistance to powdery mildew.

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Section: Introductionmentioning

confidence: 99%

Estimation of genetic parameters and prediction of breeding values for apple fruit-quality traits using pedigreed plant material in Europe

Kouassi

Durel

Costa

et al. 2009

Tree Genetics & Genomes

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“…Similarly, priority breeding objectives for European winter wheat breeding programs include resistance to powdery mildew, stripe rust, industrial quality and resistance to other biotic stresses (Karsai et al 2012). The genetic diversity present within synthetic hexaploids has been assessed for its resistance to Russian wheat aphid (Castro et al 2004, Sotelo et al 2009), green bug (Lage et al 2003, Castro et al 2004, and powdery mildew (Gill et al 1996, Lutz et al 1995, Miranda et al 2006). The diversity is expansive and highly pursued by global wheat researchers using conventional and spring wheat based alien genetic resources (Mujeeb-Kazi 2003, 2006.…”

Section: Discussionmentioning

confidence: 99%

Analysis of Genetic Diversity in Synthetic Wheat Assemblage (T. turgidum^|^times;Aegilops tauschii; 2n=6x=42; AABBDD) for Winter Wheat Breeding

et al. 2014

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Summary An unconventional genetic resource for bread wheat improvement is the diploid D genome donor to bread wheat; Aegilops tauschii (2n=2x=14, DD). Bridge crossing the Triticum turgidum/Aegilops tauschii results in synthetic hexaploid (SH) wheats; the most common method of wheat improvement that efficiently utilizes the diversity of this diploid wheat progenitor of the primary gene pool. SH wheats exhibit spring or winter growth habits, depending on the parental durum germplasm. This study focuses on the molecular diversity among 58 winter synthetic hexaploid wheat (WSH) combinations that have been produced to facilitate winter wheat breeding programs. Genetic diversity and genome-wide linkage disequilibrium (LD) were investigated for all D-genome chromosomes using SSR markers. LD analysis based on 71 microsatellite loci represented a mean marker density of 7.1 cm. A total of 738 alleles ranging from 3 to 20 per locus were characterized in WSHs. The mean PIC and MI values were 0.61 and 3.41, ranging from 0.14 to 0.86 and 0.02 to 9.6, respectively. The analysis of molecular variance and Wright s fixation index further established significant genetic diversity among different clusters and durum groups leading to the conclusion that diversity within WSHs is well validated. The population structure also partially validated the cluster analysis by forming eight (K=6) sub-populations. The variable patterns of LD independent of the genetic distance (cm) in some cases provided critical information for these resynthesized winter wheat genetic resources for their future deployment and association mapping studies. Molecular analyses, thus, have established ample diversity that is present within these winter SHs and generated information for effectively introducing new diversity from these unique genetic resources into the prevalent winter wheat germplasm.

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“…Some of these genes have several alleles (McIntosh et al, 2007). Moreover, there are a number of major genes mentioned in publications but up to now with temporary designation Miranda et al, 2006). However, the resistance conferred by these major genes is easily overcome by new pathogen races possessing the corresponding virulence genes (Shaner, 1973;Wang et al, 2005).…”

Section: Introductionmentioning

confidence: 99%

Powdery Mildew Resistance of the Lithuanian Winter Wheat Breeding Material

Liatukas¹,

Ruzgas²

2009

Proceedings of the Latvian Academy of Sciences. Section B. Natural, Exact, and Applied Sciences.

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Communicated by Îzaks RaðalsAt the Lithuanian Institute of Agriculture, during 2004Agriculture, during -2006 to powdery mildew of approximately 1,500 winter wheat lines was assessed in check and competitive trial nurseries. Our experimental evidence showed that there were no genotypes with effective resistance singlegenes among the lines tested. Effective powdery mildew resistance from start to end of vegetation season depended on the quantitative resistance level. The most resistant lines were evaluated with a score of 2 and area under the disease progress curve (AUDPC) values ranging between 1.0-5.4. The most susceptible genotypes from the collection nurseries had score 8-9 and AUDPC values ranging between 1350-2220. The correlations between maximal disease severity and AUDPC values were strong (r = 0.79-0.92). Genotypes with AUDPC values up to 10 represented 93 lines or 7% in the check trial nursery and 22 lines or 9% in the competitive trial nursery. Lines evaluated with a score 4-5 and AUDPC value 100-300 dominated in 2004.In the next year the dominant genotypes had resistance scores [3][4]. The highest powdery mildew resistance (score 2 and AUDPC value 1.0) was identified for the lines Maverich/Victo, Flair/Lut.9392, Strumok/Lut.9321, Strumok/Lut.9313 with natural infection. Resistance to powdery mildew of approximately 1,500 breeding lines of winter wheat from competitive trial (generations F7-10) (CTN) and check (generations F6-7) nurseries (CN) was investigated under natural infection. The majority of cultivars used as parental forms were from European counties, some from Russia, Ukraine, Kazakhstan and USA. Cultivars used for breeding possessed single gene resistance to powdery mildew, however, these genes were totally inefficient (Anonymous, 2003;2006;Liatukas and Ruzgas, 2004;Wang et al., 2005 soil. N 90 P 60 K 60 was applied annually. Phosphorus and potassium fertilizers were applied before sowing and nitrogen in spring after resumption of vegetative growth. Plots were sprayed with herbicides in spring when weeds started to grow intensively. Other pesticides and additional fertilization were not applied.Diseases were assessed from stem elongation (BBCH 30-31) to late milk development (BBCH 77). Resistance to diseases was measured using a 1-9 scale: score 1 no visible symptoms of diseases, score 9 plants heavily infected (infection ≥ 80%). The highest disease severity was used as the disease index (DI).The area under the disease progress curve (AUDPC) from plots of disease severity against time, from the first scoring to the last.where "t" is time in days, "y" is the percentage of affected foliage at each reading and "n" is the number of readings (Campbell and Madden, 1990). Figure 1 shows the level of partial resistance in winter wheat breeding lines. The most resistant lines with AUDPC value not exceeding 10 had the disease index 2; the most susceptible ones had score 9 and AUDPC value over 1000. The next year lines were more resistant. Lines from CN had DI from 2 to 3 and AUDPC ranging from 3...

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Pm34: a new powdery mildew resistance gene transferred from Aegilops tauschii Coss. to common wheat (Triticum aestivum L.)

Cited by 131 publications

References 43 publications

Estimation of genetic parameters and prediction of breeding values for apple fruit-quality traits using pedigreed plant material in Europe

Estimation of genetic parameters and prediction of breeding values for apple fruit-quality traits using pedigreed plant material in Europe

Analysis of Genetic Diversity in Synthetic Wheat Assemblage (T. turgidum^|^times;Aegilops tauschii; 2n=6x=42; AABBDD) for Winter Wheat Breeding

Powdery Mildew Resistance of the Lithuanian Winter Wheat Breeding Material

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