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Guo J, Zhao C, Gupta S, Platz G, Snyman L, Zhou M. Genome-wide association mapping for seedling and adult resistance to powdery mildew in barley. TAG. THEORETICAL AND APPLIED GENETICS. THEORETISCHE UND ANGEWANDTE GENETIK 2024; 137:50. [PMID: 38363421 PMCID: PMC10873221 DOI: 10.1007/s00122-024-04550-y] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/10/2023] [Accepted: 01/10/2024] [Indexed: 02/17/2024]
Abstract
KEY MESSAGE Two new major QTL were identified for powdery mildew resistance. We confirmed that the QTL on 7HS contributed mainly to the adult-plant resistance, while another one on chromosome arm 1HS made a significant contribution to the seedling resistance. Powdery mildew (PM), caused by Blumeria hordei, can occur at all post emergent stages of barley and constantly threatens crop production. To identify more genes for effective resistance to powdery mildew for use in breeding programs, 696 barley accessions collected from different regions of the world were evaluated for PM resistance at seedling and adult growth stages in three different states of Australia. These barley accessions were genotyped using DArTSeq with over 18,000 markers for a genome-wide association study (GWAS). Using the FarmCPU model, 54 markers showed significant associations with PM resistance scored at the seedling and adult-plant stages in different states of Australia. Another 40 markers showed tentative associations (LOD > 4.0) with resistance. These markers are distributed across all seven barley chromosomes. Most of them were grouped into eleven QTL regions, coinciding with the locations of most of the reported resistance genes. Two major MTAs were identified on chromosome arms 3HS and 5HL, with one on 3HS contributing to adult plant resistance and the one on 5HL to both seedling and adult plant resistance. An MTA on 7HS contributed mainly to the adult-plant resistance, while another one on chromosome arm 1HS made a significant contribution to the seedling resistance.
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Affiliation(s)
- Jie Guo
- College of Agronomy, Shanxi Agricultural University, Jinzhong, 030801, China
| | - Chenchen Zhao
- Tasmanian Institute of Agriculture, University of Tasmania, Launceston, TAS, 7250, Australia
| | - Sanjiv Gupta
- Western Crop Genetics Alliance, College of Science, Health, Engineering and Education, Murdoch University, Murdoch, 6150, Australia
- Department of Primary Industries and Regional Development, South Perth, WA, Australia
| | - Greg Platz
- Department of Agriculture and Fisheries, Hermitage Research Facility, Warwick, QLD, 4370, Australia
| | - Lisle Snyman
- Department of Agriculture and Fisheries, Hermitage Research Facility, Warwick, QLD, 4370, Australia
| | - Meixue Zhou
- College of Agronomy, Shanxi Agricultural University, Jinzhong, 030801, China.
- Tasmanian Institute of Agriculture, University of Tasmania, Launceston, TAS, 7250, Australia.
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Boczkowska M, Puchta-Jasińska M, Bolc P, Moskal K, Puła S, Motor A, Bączek K, Groszyk J, Podyma W. Characterization of the Moroccan Barley Germplasm Preserved in the Polish Genebank as a First Step towards Selecting Forms with Increased Drought Tolerance. Int J Mol Sci 2023; 24:16350. [PMID: 38003539 PMCID: PMC10671370 DOI: 10.3390/ijms242216350] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/24/2023] [Revised: 11/10/2023] [Accepted: 11/12/2023] [Indexed: 11/26/2023] Open
Abstract
In marginal, arid, and semi-arid areas of Morocco, crops are often exposed to multiple abiotic and biotic stresses that have a major impact on yield. Farmer-maintained Moroccan landraces have been shaped by the impact of very strong selection pressures, gradually adapting to the local ecosystem and obsolete low-input agricultural practices without improvement towards high yield and quality. Considering the increasing threat of drought in Poland, it is necessary to introduce germplasm with tolerance to water deficit into barley breeding programs. The aim of this research was a DArTseq-based genetic characterization of a collection of germplasm of Moroccan origin, conserved in the Polish genebank. The results showed that all conserved landraces have a high level of heterogeneity and their gene pool is different from the material developed by Polish breeders. Based on the analysis of eco-geographical data, locations with extremely different intensities of drought stress were selected. A total of 129 SNPs unique to accessions from these locations were identified. In the neighborhood of the clusters of unique SNPs on chromosomes 5H and 6H, genes that may be associated with plant response to drought stress were identified. The results obtained may provide a roadmap for further research to support Polish barley breeding for increased drought tolerance.
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Affiliation(s)
- Maja Boczkowska
- Plant Breeding and Acclimatization Institute—National Research Institute, Radzików, 05-870 Błonie, Poland; (M.P.-J.); (P.B.); (K.M.); (S.P.); (A.M.); (J.G.); (W.P.)
| | - Marta Puchta-Jasińska
- Plant Breeding and Acclimatization Institute—National Research Institute, Radzików, 05-870 Błonie, Poland; (M.P.-J.); (P.B.); (K.M.); (S.P.); (A.M.); (J.G.); (W.P.)
| | - Paulina Bolc
- Plant Breeding and Acclimatization Institute—National Research Institute, Radzików, 05-870 Błonie, Poland; (M.P.-J.); (P.B.); (K.M.); (S.P.); (A.M.); (J.G.); (W.P.)
| | - Kinga Moskal
- Plant Breeding and Acclimatization Institute—National Research Institute, Radzików, 05-870 Błonie, Poland; (M.P.-J.); (P.B.); (K.M.); (S.P.); (A.M.); (J.G.); (W.P.)
| | - Szymon Puła
- Plant Breeding and Acclimatization Institute—National Research Institute, Radzików, 05-870 Błonie, Poland; (M.P.-J.); (P.B.); (K.M.); (S.P.); (A.M.); (J.G.); (W.P.)
| | - Adrian Motor
- Plant Breeding and Acclimatization Institute—National Research Institute, Radzików, 05-870 Błonie, Poland; (M.P.-J.); (P.B.); (K.M.); (S.P.); (A.M.); (J.G.); (W.P.)
| | - Katarzyna Bączek
- Department of Vegetable and Medicinal Plants, Institute of Horticultural Sciences, Warsaw University of Life Sciences SGGW, 159 Nowoursynowska Str., 02-776 Warsaw, Poland;
| | - Jolanta Groszyk
- Plant Breeding and Acclimatization Institute—National Research Institute, Radzików, 05-870 Błonie, Poland; (M.P.-J.); (P.B.); (K.M.); (S.P.); (A.M.); (J.G.); (W.P.)
| | - Wiesław Podyma
- Plant Breeding and Acclimatization Institute—National Research Institute, Radzików, 05-870 Błonie, Poland; (M.P.-J.); (P.B.); (K.M.); (S.P.); (A.M.); (J.G.); (W.P.)
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Genievskaya Y, Zatybekov A, Abugalieva S, Turuspekov Y. Identification of Quantitative Trait Loci Associated with Powdery Mildew Resistance in Spring Barley under Conditions of Southeastern Kazakhstan. PLANTS (BASEL, SWITZERLAND) 2023; 12:2375. [PMID: 37376001 DOI: 10.3390/plants12122375] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/23/2023] [Revised: 06/16/2023] [Accepted: 06/17/2023] [Indexed: 06/29/2023]
Abstract
Barley (Hordeum vulgare L.) is one of the most produced cereal crops in the world. It has traditionally been used for the production of animal feed and for malting, as well as for human consumption. However, its production is highly affected by biotic stress factors, particularly the fungal pathogen Blumeria graminis (DC.) f. sp. hordei (Bgh), which causes powdery mildew (PM). In this study, a collection of 406 barley accessions from the USA, Kazakhstan, Europe, and Africa were assessed for resistance to PM over a 3-year period in southeastern Kazakhstan. The collection was grown in the field in 2020, 2021, and 2022 and was genotyped using the 9K SNP Illumina chip. A genome-wide association study (GWAS) was conducted to identify the quantitative trait loci (QTLs) associated with PM resistance. As a result, seven QTLs for PM resistance were detected on chromosomes 4H, 5H, and 7H (FDR p-values < 0.05). Genetic positions of two QTLs were similar to those of PM resistance QTLs previously reported in the scientific literature, suggesting that the five remaining QTLs are novel putative genetic factors for the studied trait. Haplotype analysis for seven QTLs revealed three haplotypes which were associated with total PM resistance and one haplotype associated with the high PM severity in the barley collection. Identified QTLs and haplotypes associated with the PM resistance of barley may be used for further analysis, trait pyramiding, and marker-assisted selection.
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Affiliation(s)
- Yuliya Genievskaya
- Laboratory of Molecular Genetics, Institute of Plant Biology and Biotechnology, Almaty 050040, Kazakhstan
- Faculty of Biology and Biotechnology, Al-Farabi Kazakh National University, Almaty 050040, Kazakhstan
| | - Alibek Zatybekov
- Laboratory of Molecular Genetics, Institute of Plant Biology and Biotechnology, Almaty 050040, Kazakhstan
| | - Saule Abugalieva
- Laboratory of Molecular Genetics, Institute of Plant Biology and Biotechnology, Almaty 050040, Kazakhstan
- Faculty of Biology and Biotechnology, Al-Farabi Kazakh National University, Almaty 050040, Kazakhstan
| | - Yerlan Turuspekov
- Laboratory of Molecular Genetics, Institute of Plant Biology and Biotechnology, Almaty 050040, Kazakhstan
- Faculty of Biology and Biotechnology, Al-Farabi Kazakh National University, Almaty 050040, Kazakhstan
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Chromosomal Location of Pm12-A Novel Powdery Mildew Resistance Gene from Avena sterilis. Genes (Basel) 2022; 13:genes13122409. [PMID: 36553676 PMCID: PMC9778159 DOI: 10.3390/genes13122409] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/05/2022] [Revised: 12/08/2022] [Accepted: 12/16/2022] [Indexed: 12/23/2022] Open
Abstract
Identification of new, effective disease resistance genes is a very important aspect of plant breeding. Also important is the precise location of individual loci and tagging them with DNA markers for marker assisted selection. The aim of the present study was identification of the molecular markers linked with Pm12, a new effective resistance gene to powdery mildew, and their location in the oat genome. The analysis was performed on 167 F2 individuals from a hybrid of Fuchs × CN67383, with the status of the locus in each individual verified by progeny test in F3. Segregation ratios confirmed the monogenic nature of resistance. Making use of the sequence data of DNA markers and the oat OT3098 v2 genome reference assembly, Pm12 is located on chromosome 7C. A comparison was also made with the reference consensus map, to which there are more reports of mapped genes to date. The mapping results suggest that Pm12 is located in the interval 103.8-111.7 cM on this map. No powdery mildew resistance locus has been identified in this region so far, suggesting that Avena sterilis CN67383 carries a novel locus offering effective resistance in oat breeding. The information included in the oat genome annotation allowed for the identification of candidate genes in the close region of the marker cluster for Pm12. This information may provide an interesting source of further analysis of the pathways of various genes in response to the stress of powdery mildew infection.
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Xu C, Zhan C, Huang S, Xu Q, Tang T, Wang Y, Luo J, Zeng X. Resistance to Powdery Mildew in Qingke Involves the Accumulation of Aromatic Phenolamides Through Jasmonate-Mediated Activation of Defense-Related Genes. FRONTIERS IN PLANT SCIENCE 2022; 13:900345. [PMID: 35845698 PMCID: PMC9280689 DOI: 10.3389/fpls.2022.900345] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/20/2022] [Accepted: 05/25/2022] [Indexed: 05/08/2023]
Abstract
Powdery mildew (PM) leads to severe yield reduction in qingke (Hordeum vulgare L. var. nudum). Although studies have focused on identifying PM-related resistance genes, mechanistic insights into the metabolic regulation networks of resistance against PM have rarely been explored in qingke. Here, we integrated transcriptomic, proteomic and metabolomic data using PM-susceptible (G72) and PM-resistant (K69) accessions to systemically explore the mechanisms of PM resistance. The integrated results show that a rapidly transduction of jasmonic acid (JA) and (+)-7-iso-jasmonoyl-L-isoleucine (JA-Ile), and importantly, a inducing accumulation of aromatic PAs conferred qingke-specific resistance for PM stress. Functional analysis revealed that the four BAHD N-acyltransferase genes were responsible for the synthesis of aliphatic and aromatic PAs. The expression of the four genes are induced by methyl jasmonate (MeJA) and PM treatment. Co-expression network analysis shows that a histone lysine demethylase, JMJ705 gene, also induced by MeJA and PM treatment, had highly correlation with PAs biosynthesis. Chromatin immunoprecipitation (ChIP)-seq assays revealed that the level of trimethylated histone H3 lysine 27 (H3K27me3) of the four genes in MeJA and PM-treated plants was significantly reduced. Overall, our results suggest that a novel strategy for jasmonic acid signal-mediated demethylation controlling the accumulation of aromatic PAs to enhance plant immune resistance through removal of H3K27me3 and activating defense-related gene expression.
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Affiliation(s)
- Congping Xu
- State Key Laboratory of Hulless Barley and Yak Germplasm Resources and Genetic Improvement, Lhasa, China
- Tibet Academy of Agricultural and Animal Husbandry Sciences Lhasa, Tibet, China
- College of Tropical Crops, Hainan University, Haikou, China
- Sanya Nanfan Research Institute of Hainan University, Hainan Yazhou Bay Seed Laboratory, Sanya, China
| | - Chuansong Zhan
- College of Tropical Crops, Hainan University, Haikou, China
- Sanya Nanfan Research Institute of Hainan University, Hainan Yazhou Bay Seed Laboratory, Sanya, China
| | - Sishu Huang
- College of Tropical Crops, Hainan University, Haikou, China
- Sanya Nanfan Research Institute of Hainan University, Hainan Yazhou Bay Seed Laboratory, Sanya, China
| | - Qijun Xu
- State Key Laboratory of Hulless Barley and Yak Germplasm Resources and Genetic Improvement, Lhasa, China
- Tibet Academy of Agricultural and Animal Husbandry Sciences Lhasa, Tibet, China
| | - Tang Tang
- Wuhan Metware Biotechnology Co., Ltd., Wuhan, China
| | - Yulin Wang
- State Key Laboratory of Hulless Barley and Yak Germplasm Resources and Genetic Improvement, Lhasa, China
| | - Jie Luo
- College of Tropical Crops, Hainan University, Haikou, China
- Sanya Nanfan Research Institute of Hainan University, Hainan Yazhou Bay Seed Laboratory, Sanya, China
- *Correspondence: Jie Luo,
| | - Xingquan Zeng
- State Key Laboratory of Hulless Barley and Yak Germplasm Resources and Genetic Improvement, Lhasa, China
- Tibet Academy of Agricultural and Animal Husbandry Sciences Lhasa, Tibet, China
- Plant Sciences College, Tibet Agriculture and Animal Husbandry University, Tibet, China
- Xingquan Zeng,
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Hautsalo J, Novakazi F, Jalli M, Göransson M, Manninen O, Isolahti M, Reitan L, Bergersen S, Krusell L, Damsgård Robertsen C, Orabi J, Due Jensen J, Jahoor A, Bengtsson T. Pyramiding of scald resistance genes in four spring barley MAGIC populations. TAG. THEORETICAL AND APPLIED GENETICS. THEORETISCHE UND ANGEWANDTE GENETIK 2021; 134:3829-3843. [PMID: 34350474 PMCID: PMC8580920 DOI: 10.1007/s00122-021-03930-y] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 05/14/2021] [Accepted: 07/27/2021] [Indexed: 06/13/2023]
Abstract
Genome-Wide Association Studies (GWAS) of four Multi-parent Advanced Generation Inter-Cross (MAGIC) populations identified nine regions on chromosomes 1H, 3H, 4H, 5H, 6H and 7H associated with resistance against barley scald disease. Three of these regions are putatively novel resistance Quantitative Trait Loci (QTL). Barley scald is caused by Rhynchosporium commune, one of the most important barley leaf diseases that are prevalent in most barley-growing regions. Up to 40% yield losses can occur in susceptible barley cultivars. Four MAGIC populations were generated in a Nordic Public-Private Pre-breeding of spring barley project (PPP Barley) to introduce resistance to several important diseases. Here, these MAGIC populations consisting of six to eight founders each were tested for scald resistance in field trials in Finland and Iceland. Eight different model covariate combinations were compared for GWAS studies, and the models that deviated the least from the expected p-values were selected. For all QTL, candidate genes were identified that are predicted to be involved in pathogen defence. The MAGIC progenies contained new haplotypes of significant SNP-markers with high resistance levels. The lines with successfully pyramided resistance against scald and mildew and the significant markers are now distributed among Nordic plant breeders and will benefit development of disease-resistant cultivars.
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Affiliation(s)
- Juho Hautsalo
- Natural Resources Institute Finland (Luke), Survontie 9, 40500, Jyväskylä, Finland
| | - Fluturë Novakazi
- Department of Plant Breeding, Swedish University of Agricultural Sciences, P.O. Box 190, 234 22, Lomma, Sweden
| | - Marja Jalli
- Natural Resources Institute Finland (Luke), Tietotie 4, 31600, Jokioinen, Finland
| | - Magnus Göransson
- Faculty of Land and Animal Resources, The Agricultural University of Iceland, Hvanneyri, 311, Borgarnes, Iceland
| | - Outi Manninen
- Boreal Plant Breeding Ltd., Myllytie 10, 31600, Jokioinen, Norway
| | - Mika Isolahti
- Boreal Plant Breeding Ltd., Myllytie 10, 31600, Jokioinen, Norway
| | - Lars Reitan
- Graminor Ltd. Hommelstadvegen 60, 2322, Ridabu, Norway
| | | | - Lene Krusell
- Sejet Plant Breeding, Nørremarksvej 67, 8700, Horsens, Norway
| | | | - Jihad Orabi
- Nordic Seed A/S, Kornmarken 1, 8464, Galten, Denmark
| | | | - Ahmed Jahoor
- Department of Plant Breeding, Swedish University of Agricultural Sciences, P.O. Box 190, 234 22, Lomma, Sweden
- Nordic Seed A/S, Kornmarken 1, 8464, Galten, Denmark
| | - Therése Bengtsson
- Department of Plant Breeding, Swedish University of Agricultural Sciences, P.O. Box 190, 234 22, Lomma, Sweden.
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Importance of Landraces in Cereal Breeding for Stress Tolerance. PLANTS 2021; 10:plants10071267. [PMID: 34206299 PMCID: PMC8309184 DOI: 10.3390/plants10071267] [Citation(s) in RCA: 13] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 06/10/2021] [Accepted: 06/17/2021] [Indexed: 12/12/2022]
Abstract
The renewed focus on cereal landraces is a response to some negative consequences of modern agriculture and conventional breeding which led to a reduction of genetic diversity. Cereal landraces are still cultivated on marginal lands due to their adaptability to unfavourable conditions, constituting an important source of genetic diversity usable in modern plant breeding to improve the adaptation to abiotic or biotic stresses, yield performance and quality traits in limiting environments. Traditional agricultural production systems have played an important role in the evolution and conservation of wide variability in gene pools within species. Today, on-farm and ex situ conservation in gene bank collections, together with data sharing among researchers and breeders, will greatly benefit cereal improvement. Many efforts are usually made to collect, organize and phenotypically and genotypically analyse cereal landrace collections, which also utilize genomic approaches. Their use in breeding programs based on genomic selection, and the discovery of beneficial untapped QTL/genes/alleles which could be introgressed into modern varieties by MAS, pyramiding or biotechnological tools, increase the potential for their better deployment and exploitation in breeding for a more sustainable agricultural production, particularly enhancing adaptation and productivity in stress-prone environments to cope with current climate changes.
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Novakazi F, Krusell L, Jensen JD, Orabi J, Jahoor A, Bengtsson T. You Had Me at "MAGIC"!: Four Barley MAGIC Populations Reveal Novel Resistance QTL for Powdery Mildew. Genes (Basel) 2020; 11:genes11121512. [PMID: 33352820 PMCID: PMC7766815 DOI: 10.3390/genes11121512] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/10/2020] [Revised: 12/11/2020] [Accepted: 12/15/2020] [Indexed: 11/23/2022] Open
Abstract
Blumeria graminis f. sp. hordei (Bgh), the causal agent of barley powdery mildew (PM), is one of the most important barley leaf diseases and is prevalent in most barley growing regions. Infection decreases grain quality and yields on average by 30%. Multi-parent advanced generation inter-cross (MAGIC) populations combine the advantages of bi-parental and association panels and offer the opportunity to incorporate exotic alleles into adapted material. Here, four barley MAGIC populations consisting of six to eight founders were tested for PM resistance in field trials in Denmark. Principle component and STRUCTURE analysis showed the populations were unstructured and genome-wide linkage disequilibrium (LD) decay varied between 14 and 38 Mbp. Genome-wide association studies (GWAS) identified 11 regions associated with PM resistance located on chromosomes 1H, 2H, 3H, 4H, 5H and 7H, of which three regions are putatively novel resistance quantitative trait locus/loci (QTL). For all regions high-confidence candidate genes were identified that are predicted to be involved in pathogen defense. Haplotype analysis of the significant SNPs revealed new allele combinations not present in the founders and associated with high resistance levels.
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Affiliation(s)
- Fluturë Novakazi
- Department of Plant Breeding, Swedish University of Agricultural Sciences, P.O. Box 101, 23053 Alnarp, Sweden; (F.N.); (A.J.)
| | - Lene Krusell
- Sejet Plant Breeding, Nørremarksvej 67, 8700 Horsens, Denmark;
| | - Jens Due Jensen
- Nordic Seed A/S, Kornmarken 1, 8464 Galten, Denmark; (J.D.J.); (J.O.)
| | - Jihad Orabi
- Nordic Seed A/S, Kornmarken 1, 8464 Galten, Denmark; (J.D.J.); (J.O.)
| | - Ahmed Jahoor
- Department of Plant Breeding, Swedish University of Agricultural Sciences, P.O. Box 101, 23053 Alnarp, Sweden; (F.N.); (A.J.)
- Nordic Seed A/S, Kornmarken 1, 8464 Galten, Denmark; (J.D.J.); (J.O.)
| | - Therése Bengtsson
- Department of Plant Breeding, Swedish University of Agricultural Sciences, P.O. Box 101, 23053 Alnarp, Sweden; (F.N.); (A.J.)
- Correspondence:
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Dreiseitl A. Specific Resistance of Barley to Powdery Mildew, Its Use and Beyond. A Concise Critical Review. Genes (Basel) 2020; 11:E971. [PMID: 32825722 PMCID: PMC7565388 DOI: 10.3390/genes11090971] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/15/2020] [Revised: 08/12/2020] [Accepted: 08/20/2020] [Indexed: 11/18/2022] Open
Abstract
Powdery mildew caused by the airborne ascomycete fungus Blumeria graminis f. sp. hordei (Bgh) is one of most common diseases of barley (Hordeum vulgare). This, as with many other plant pathogens, can be efficiently controlled by inexpensive and environmentally-friendly genetic resistance. General requirements for resistance to the pathogens are effectiveness and durability. Resistance of barley to Bgh has been studied intensively, and this review describes recent research and summarizes the specific resistance genes found in barley varieties since the last conspectus. Bgh is extraordinarily adaptable, and some commonly recommended strategies for using genetic resistance, including pyramiding of specific genes, may not be effective because they can only contribute to a limited extent to obtain sufficient resistance durability of widely-grown cultivars. In spring barley, breeding the nonspecific mlo gene is a valuable source of durable resistance. Pyramiding of nonspecific quantitative resistance genes or using introgressions derived from bulbous barley (Hordeum bulbosum) are promising ways for breeding future winter barley cultivars. The utilization of a wide spectrum of nonhost resistances can also be adopted once practical methods have been developed.
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Affiliation(s)
- Antonín Dreiseitl
- Department of Integrated Plant Protection, Agrotest Fyto Ltd., Havlíčkova 2787, CZ-767 01 Kroměříž, Czech Republic
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