Mating types ofExserohilum turcicum in Israel
- 34 Downloads
Fifty-one single conidial isolates ofExserohilum turcicum were collected from seven locations in Israel and three in the USA and tested for mating type and aggressiveness. Sixteen isolates mated were mating type a; 29 were mating type A; and six failed to mate with either the A or the a mating type. Isolates differed significantly in their ability to cause lesions of different sizes, and in their ability to produce conidia on the susceptible corn hybrid Jubilee. They also differed in their rate of growth on lactose casein agar. No significant difference in lesion size or conidial production was noted between mating types. Conidial production and radial growth were significantly lower for isolates with no mating capacity as compared with conidial production of defined mating types. Pseudothecia were produced after 14–16 and 21 days when mating occurred onSorghum halepense straw or barley straw, respectively. The average number of pseudothecia produced on 10 cm2 of straw was 17 and 8 forS. halepense and barley, respectively. Pseudothecia were not produced on corn straw.
Key WordsExserohilum turcicum epidemiologyl sexual reproduction
Unable to display preview. Download preview PDF.
- 4.Leonard, K.J., Levy, Y. and Smith, D.R. (1989) Proposed nomenclature for races ofExserohilum turcicum on corn.Plant Dis. 73:776–777.Google Scholar
- 5.Levy, Y. (1984) The overwintering ofExserohilum turcicum in Israel.Phytoparasitica 12:177–182.Google Scholar
- 7.Levy, Y. (1991) Variation in fitness among isolates ofExserohilum turcicum in Israel.Plant Dis. 75:163–166.Google Scholar
- 8.Levy, Y. and Cohen, Y. (1980) Sporulation ofHelminthosporium turcicum on sweet corn: effects of light and sugars.Physiol. Plant Pathol. 18:17–25.Google Scholar
- 9.Luttrell, E.S. (1958) The perfect stage ofHelminthosporium turcicum.Phytopathology 48:281–287.Google Scholar
- 10.Nelson, R.R. (1964) Genetic inhibition of perithecial formation inCochliobolus carbonum.Phytopathology 54:876–877.Google Scholar
- 12.Pedersen, W.L., Perkins, J.M. and Hooker, A.L. (1985) The release of nine corn inbreds carrying theHt 2 orHt 3 genes (BC6-S5) for resistance ofExserohilum turcicum, race 2.Proc. Twenty-first Ann. Illinois Corn Breeders School (Urbana, ILL).Google Scholar
- 13.Shurtleff, M.D. (1980) Compendium of Corn Diseases. American Phytopathological Society, St. Paul., MN, USA.Google Scholar
- 14.Tuite, J. (1969) Plant Pathological Methods. Burgess Publ. Co., Minneapolis, MN, USA.Google Scholar
- 15.Windes, J.M. and Pedersen, W.L. (1991) An isolate ofExserohilum turcicum virulent on maize with resistant gene HTN.Plant Dis. 73:430.Google Scholar