Abstract
A set of differentials of corn plants(Zea mays L.) containing Ht1, Ht2, Ht3 or HtN genes was used to identify races ofExserohilum turcicum in Israel. Plants were inoculated with 14 isolates ofE. turcicum collected from various regions in Israel (from Ayyelet HaShahar in the north to Sa’ad in the south). Differentials containing Ht1, Ht2, Ht3 or HtN genes were resistant to the 14 isolates tested, whereas the inbred lines without Ht genes were highly sensitive. Resistance was characterized by the formation of non-sporulating chlorotic lesions. When plants containing Ht1, Ht2 or Ht3 genes were inoculated with relatively high inoculum concentrations (over 50 conidia/drop), chlorotic lesions were associated with necrosis in the center of the lesions. Sporulation of the fungus in the necrotic parts of the lesions was significantly less than on plants without Ht genes. No necrosis was observed in plants with the HtN gene. Our results indicate that the physiological race ofE. turcicum in Israel is race 1.
This is a preview of subscription content, log in via an institution to check access.
Similar content being viewed by others
References
Elliot, C. and Jenkins, M.T. (1946)Helminthosporium turcicum leaf blight of corn.Phytopathology 36:660–666.
Gevers, H.O. (1975) A new major gene for resistance toHelminthosporium turcicum leaf blight of maize.PI. Dis. Reptr 59:296–299.
Hooker, A.L. (1977) A second major gene locus in corn for chlorotic lesion resistance toHelminthosporium turcicum.Crop Sci. 17:132–135.
Hooker, A.L. and Perkins, J. M. (1980) Helminthosporium leaf blight of corn — the state of the art. Proc. 35th A. Corn and Sorghum Research Conf. (Chicago, IL), pp. 68–87.
Jenkins, M.T. and Robert, A.L. (1952) Inheritance of resistance to the leaf blight of corn caused byHelminthosporium turcicum.Agron. J. 44:136–140.
Leath, S. and Pederson, W.L. (1984) An inoculation technique to detect the HtN gene in inbred lines of com under greenhouse conditions.Pl. Dis. 67:520–522.
Leath, S. and Pederson, W.L. (1986) Differences in resistance between maize hybrids with or without the Ht1 gene when infected withExserohilun turcicum race 2.Phytopathology 76:257–260.
Levy, Y. (1985) Fungicidal control of the northern leaf blight of corn.BCPC Monogr. 31:375- 378.
Levy, Y. and Cohen, Y. (1979) Seasonal fluctuations in epidemics of the northern leaf blight of com in Israel.Phytoparasitica 7:59–60 (abstr.).
Pataky, J.K., Perkins, J.M. and Leath, S. (1986) Effects of qualitative and quantitative resistance on the development and spread of maize caused byExserohilum turcicum races 1 and 2.Phytopathology 76:1349–1352.
Perkins, J.M. and Hooker, A.L. (1981) Reaction of eighty four sources of chlorotic lesion resistance in com to three biotypes ofHelminthosporium turcicum.Pl. Dis. 65:502–504.
Sigulas, K.M., Hill, R.R. and Ayers, J.E. (1988) Genetic analysis ofHelminthosporium lurcicum lesion expansion on corn.Phytopathology 78:149–153.
Smith, D.R. and Kinsey, J.R. (1980) Further physiological specialization ofHelminthosporium turcicum.Pl. Dis. 64:779–781.
Author information
Authors and Affiliations
Rights and permissions
About this article
Cite this article
Abadi, R., Levy, Y. & Bar-Tsur, A. Physiological races ofExserohilum turcicum in Israel. Phytoparasitica 17, 23–30 (1989). https://doi.org/10.1007/BF02979602
Received:
Revised:
Issue Date:
DOI: https://doi.org/10.1007/BF02979602