Relationships Between Disease Reactions under Controlled Conditions and Severity of Wheat Bacterial Streak in the Field

Milus, E. A.; Duveiller, E.; Kirkpatrick, T. L.; Chalkley, David

doi:10.1094/pd-80-0726

Cited by 18 publications

(11 citation statements)

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“…Effect of relative maturity on expression of BLS resistance was also observed in previous studies (12,19). Effect of relative maturity on expression of BLS resistance was also observed in previous studies (12,19).…”

Section: Discussionsupporting

confidence: 75%

Evaluation of Spring Wheat Germplasm for Resistance to Bacterial Leaf Streak Caused by Xanthomonas campestris pv. translucens

et al. 2012

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Kandel, Y. R., Glover, K. D., Tande, C. A., and Osbome, L. E. 2012. Evaluation of spring wheat germplasm for resistance to bacterial leaf streak caused by Xanthomonas campestris pv. translucens. Plant Dis. 96:1743-1748.Bacterial leaf streak (caused by Xanthomonas campestris pv. translucens) has reemerged as a potential threat in spring wheat {Triticum aestivum) production areas in the northern Great Plains. As with other foliar bacterial diseases, chemical control under field situations is neither economical nor practical. Development of resistant genotypes will be needed for adequate management of the disease. There is currently limited information on sources of resistance in hard spring wheat germplasm. The main objective was to develop and apply a robust screening tool for evaluating germplasm against bacterial leaf streak, and to identify resistance sources for this disease. Inoculated field experiments were conducted in Brookings and Codington Counties, SD in 2009 and 2010 using a virulent local isolate {XctSD-017) inocu-lated after tillering stage. Eorty-five hard red spring wheat genotypes with diverse genetic backgrounds were evaluated for disease severity, with ratings made at 7-day intervals from heading through dough stage. Results of this study showed clear differences in level of resistance among the 45 genotypes, with no immunity expressed.

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Section: Discussionsupporting

confidence: 75%

Evaluation of Spring Wheat Germplasm for Resistance to Bacterial Leaf Streak Caused by Xanthomonas campestris pv. translucens

et al. 2012

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“…To the soil in each container, 2.5 g of multicote slow release commercial fertilizer (14–14–16 N–P–K; Sungro Horticulture Distribution Inc.) was applied at the time of planting. Wheat breeding line ND495 (Adhikari et al, 2009) and winter wheat cultivar Magnum (Milus et al, 1996) served as susceptible and resistant controls, respectively. Wheat accessions were arranged in a randomized complete block design (RCBD) with three replications.…”

Section: Methodsmentioning

confidence: 99%

Association Mapping of Quantitative Trait Loci in Spring Wheat Landraces Conferring Resistance to Bacterial Leaf Streak and Spot Blotch

et al. 2012

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Bacterial leaf streak (BLS), caused by Xanthomonas translucens pv. undulosa (Smith et al.) Bragard et al., and spot blotch (SB), caused by Cochliobolus sativus (S. Ito & Kurib.) Drechs. ex Dastur, are two emerging diseases of wheat (Triticum aestivum L.). To achieve sustainable disease management strategies and reduce yield losses, identifying new genes that confer quantitative resistance would benefi t resistance breeding efforts. The main objective of this study was to use association mapping (AM) with 832 polymorphic Diversity Arrays Technology (DArT) markers to identify genomic regions associated with resistance to BLS and SB in 566 spring wheat landraces. From data analysis of this diverse panel of wheat accessions, we discovered fi ve novel genomic regions signifi cantly associated with resistance to BLS on chromosomes 1A, 4A, 4B, 6B, and 7D. Similarly, four genomic regions were found to be associated with resistance to SB on chromosomes 1A, 3B, 7B, and 7D. A high degree of linkage disequilibrium (LD) decayed over short genetic distance in the set of wheat accessions studied, and some of these genomic regions appear to be involved in multiple disease resistance (MDR). These results suggest that the AM approach provides a platform for discovery of resistance conditioned by multiple genes with quantitative effects, which could be validated and deployed in wheat breeding programs.

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“…In the previous studies, spring wheat cultivars Pavon 76, Mochis T88, Nanjing 8331, and Thombird were found to be resistant to BLS in Mexico (8,10), while winter wheat cultivars Magnum, Bayles, Sawyer, and Terral 101 showed resistance to BLS in the United States (17). Despite efforts made in the past decade to evaluate and characterize resistance to BLS, the available pool of BLS-resistant wheat appears to be inadequate, and more materials should be evaluated to identify additional sources of resistance to BLS for use in wheat breeding programs.…”

Section: Discussionmentioning

confidence: 92%

“…Disease scores of 0 to 2 (or less than 10% water-soaking within the infiltrated areas) were considered resistant (R) (26), and 2.1 to 6 (or greater than 10% water-soaking) were regarded as susceptible (S) reactions. Wheat breeding line ND495 (1) and cultivar Magnum (17) served as susceptible (positive control) and resistant (negative control) check, respectively.…”

Section: Iviaterials and Methodsmentioning

confidence: 99%

Identification of New Sources of Resistance in Winter Wheat to Multiple Strains of Xanthomonas translucens pv. undulosa

et al. 2011

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Adhikari, T. B., Hansen, J. M., Gurung, S., and Bonman, J. M. 2011. Identification of new sources of resistance in winter wheat to multiple strains of Xanthomonas translucens pv. undulosa. Plant Dis. 95:582-588.Bacterial leaf streak (BLS), caused by Xanthomonas trans¡ucens pv. undulosa, has re-emerged as an important disease of wheat {Triticum aestivum) in the United States. Planting resistant varieties is the best approach to manage BLS in the absence of effective bactéricides. However, most of the wheat varieties currently grown in the Upper Midwest of the United States appeared to be susceptible to BLS. From the core subset of the USDA National Small Grain Collection (NSGC), a set of 605 winter wheat accessions of diverse origin and improvement status were initially inoculated with a virulent strain BLSW16 of X. translucens pv. undulosa from Casselton, ND on the flag leaf of each plant in a greenhouse. Disease reactions were assessed between 7 and 10 days after infiltration using a 0 to 6 rating scale, where <2.0 was considered resistant and >2.1 was considered susceptible. Resistance varied with geographic origin and was significantly {P < 0.05) more frequent in accessions from North America compared to accessions from northern, eastern, and southern Europe and from south-central Asia. About 8.3% of accessions tested were resistant, and accessions with an improvement status of "cultivar" were significantly more likely to be resistant than were accessions classified as either landraces or breeding lines. Forty-two of the accessions exhibiting resistance in response to the strain BLSW16 in the first screening test were retested utilizing each of the two additional strains (BLS Cr25 and BLS Lb74 of X. trans¡ucens pv. undu¡osa) collected from Carrington and Lisbon, respectively. Nonparametric data analysis revealed 35 accessions were resistant, one accession, PI 266860, was susceptible to both strains, and six accessions showed differential responses. The majority of the BLS-resistant accessions also were resistant to at least one other important wheat disease based on the Germplasm Resources Infonnation Network (GRIN) data. These results suggest that diverse and novel sources of resistance to BLS identified in this study can be utilized in winter wheat breeding programs.

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Relationships Between Disease Reactions under Controlled Conditions and Severity of Wheat Bacterial Streak in the Field

Cited by 18 publications

References 0 publications

Evaluation of Spring Wheat Germplasm for Resistance to Bacterial Leaf Streak Caused by Xanthomonas campestris pv. translucens

Evaluation of Spring Wheat Germplasm for Resistance to Bacterial Leaf Streak Caused by Xanthomonas campestris pv. translucens

Association Mapping of Quantitative Trait Loci in Spring Wheat Landraces Conferring Resistance to Bacterial Leaf Streak and Spot Blotch

Identification of New Sources of Resistance in Winter Wheat to Multiple Strains of Xanthomonas translucens pv. undulosa

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