Physiological races ofExserohilum turcicum in Israel

Molecular variability amongExserohilum turcicumisolates using RAPD (random amplified polymorphic DNA)

“…Single conidia were transferred to plates of LCA and incubated at 20°C for 14 days. Determination of races was done as described previously (2,7); four-week-old plants of the corn differential lines A619, A619-HU, A619-Ht2, A619-Ht3, and A6l9-HtN were inoculated with each isolate. Resistance and susceptibility were determined 10 days later based on the presence or absence of chlorotic lesions.…”

The Association of Peroxidase Activity and Resistance of Maize to Exserohilum turcicum

“…Plants were grown in a greenhouse in 500 ml pots. At the 5 leaf stage the plants were inoculated with a local isolate of race 1 of E. turdcum (ABADI et al 1989). Plants were inoculated with a conidial suspension of knowen concentration using a quantitative inoculator (SHEIN 1964).…”

Resistance to northern leaf blight in maize(Zea mays)conditioned by theHtNgene and the association with isoperoxidases

“…The entire field was sprinkler-irrigated by a central pivot system twice a week, with elevated amounts based on plant growth. Leaf whorls of each plant in the experimental plot were inoculated on August 17 (mid-summer), 38 days after planting, by spraying with 50 mL/plant conidial suspension (5 x 10 4 conidia per mL) of a local isolate of E. turcicum (race 0) (1). Severe natural infection with E. turcicum was detected two weeks later in the entire field.…”

“…Expression of this gene in maize plants has been shown to prolong pathogen incubation time and the latent period while reducing levels of spoliation of nearly all known races of E. turcicum (1,4,8). Although a new race of E. turcicum virulent on maize with the HtN gene has been reported (18), and race 23N has been identified in Florida (6), the HtN gene is effective against the races (0 and 1) primarily found in the U.S.A. and Israel.…”