Abstract
Differential virulence of Pyrenophora tritici-repentis (PTR) on durum wheat (Triticum turgidum var. durum Desf.) and bread wheat (T. aestivum L.) may be the first concern in developing a strategy for breeding cultivars resistant to tan spot. The objective of this study was to evaluate the variation in virulence and host specificity in PTR isolates from North Dakota, USA and Morocco. Eleven wheat genotypes were inoculated with nine PTR isolates collected in North Dakota and by eight isolates collected from different regions of Morocco. The experiments were planted in the greenhouse as split-plots, using isolates as main plots and wheat genotypes as subplots. Lesion size on individual leaves was used for disease ratings. Highly significant host genotype, pathogen isolate, and genotype X isolate effects were observed in both experiments. Cluster analysis indicated that differences among clusters of PTR isolates were larger in North Dakota, but more dissimilar patterns were observed in Moroccan isolates. Differences in host genotypes’ ranking and disease reaction patterns indicated differences in virulence between the PTR isolates from North Dakota and Morocco.
Similar content being viewed by others
Literature Cited
Carson, M.L., 1987. Assessment of six models of host pathogen interaction in horizontal pathosystems. Phytopathology 77:241–246.
Cox, D.J. & R.M. Hosford Jr., 1987. Resistant winter wheats compared at differing growth stages and leaf positions for tan spot severity. Plant Dis. 71:883–886.
Diaz de Ackerman, M., R.M. Hosford, Jr., D.J. Cox & J.J. Hammond, 1988. Resistance in winter wheats to geographically differing isolates of Pyrenophora tritici-repentis and observation on pseudoperithecia. Plant Dis. 72:1028–1031.
Elias, E., R.G. Cantrell & R.M. Hosford, Jr., 1989. Heritability of resistance to tan spot in durum wheat and its association with other agronomic traits. Crop Sci. 29:299–303.
Gilchrist, LS., 1982. Helminthosporium tritici-repentis (Pyrenophora tiitici-repentis), comoagente causal del tizon del trigo, prevalente en el estado de Michoacan, Mexico. M.S. thesis. Colegio, de Postgradados, Chapingo, Mex.
Hosford, RM, Jr., 1982. Tan spot. P. 1–24. In R. M. Hosford, Jr. (ed.). Tan Spot of Wheat and Related Diseases Workshop. N. D. State Univ., Fargo.
Lamari, L. & C.C. Bernier, 1989. Virulence of isolates of Pyrenophora tritici-repentis on 11 wheat cultivars and cytology of the differential host reactions. Can. J. Plant. Pathol. 11:284–290.
Lamari, L., C.C. Bernier & R.B. Smith, 1991. Wheat genotypes that develop both tan necrosis and extensive chlorosis in response to isolates of Pyrenophora ttitici-repentis. Plant Dis. 75:121–122.
Large, E.C., 1954. Growth stages in cereals, illustration of Feekes scale. Plant Pathol. 3:128–129.
Lee, T.S. & F.J. Gough, 1984. Inheritance of septoria leaf spot blotch (S. tritici) and pyrenophora tan spot (P. tritici-repentis) resistance in Triricum aestivum cv. Carifen 12. Plant Dis. 68:848–850.
Luz, W.C. da. & R.M. Hosford, Jr., 1980. Twelve Pyrenophora trichostoma races for virulence to wheat in the central plains of North America. Phytopathology 70:1193–1196.
Misra, A.P. & R.A. Singh, 1972. Pathogenic differences amongst three isolates of Helminthosporium tritici-repentis and the performance of wheat varieties against them. Indian J. Phytopathol. 25:350–353.
Odvody, G.N. & M.G. Boosalis, 1978. A rapid technique to study sporulation requirements of Pyrenophora tiichostoma. Phytopathol. News 12:212–213.
Rees, R.G. & G.J. Platz, 1990. Sources of resistance to Pyrenophora tritici-repentis in bread wheats. Euphytica 45:59–69.
Sah, D.N. and H. Fehrmann, 1992. Virulence patterns of geographically differing isolates of Pyrenophora tritici-repentis and sources of resistance in wheat. Plant Dis. 76:712–716.
SAS Institute Inc., 1985. SAS User’s guide: Statistics, Version 5. Edition. SAS Institute Inc., Cary, NC.
Schilder, A.M.C. & G.C. Bergstrom, 1990. Variation in virulence within the population of Pyrenophora tritici-repentis in New York. Phytopathology 80:84–90.
Sykes, E.E. & C.C. Bemier, 1991. Qualitative inheritance of tan spot resistance in hexaploid, tetraploid, and diploid wheat. Can. J. Plant Pathol. 13:38–44.
Author information
Authors and Affiliations
Rights and permissions
About this article
Cite this article
Nsarellah, N., Elias, E.M. & Cantrell, R.G. Variation in Virulence and Host Specificity of Pyrenophora tritici-repentis on Common and Durum Wheat in North Dakota, USA and Morocco. CEREAL RESEARCH COMMUNICATIONS 31, 121–128 (2003). https://doi.org/10.1007/BF03543258
Received:
Accepted:
Published:
Issue Date:
DOI: https://doi.org/10.1007/BF03543258