PHYSIOLOGIC SPECIALIZATION OF Exserohilum turcicum, IN KENYA
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چکیده
Isolates of E. turcicum from Kenya showed variation in growth rates when grown on potato dextrose agar at 22C. Most colonies reached a diameter of 9 cm in 7 to 11 days. Single-spore colony colors were similar, appearing whitish with a greenish tint that disappeared during and after onset of sporulation. Nineteen isolates were inoculated on Ht-bearing differentials of maize. Three isolates were race 0, three were race 1, one race 2, one was race 3, two were race 12; and nine did not fit any known classification and were named k1, k2 and k3, respectively. The isolate designated as k3 was virulent on germplasm with the HtN gene, but had a severe chrolotic reaction with Ht1 gene bearing differentials. The k1 group were virulent to all differentials and k2 group was virulent to Ht1, Ht2 and Ht3 gene bearing differentials. Resistant reactions were chlorotic and nonsporulating while susceptible reactions was necrotic with profuse sporulation. This is the first record of racial specialization of E. turcicum in Kenya and indicates that the Ht gene could be very useful in Kenya for the control of northern leaf blight.
منابع مشابه
RESPONSES OF FOUR CULTIVARS AND TWO INBRED LINES TO Exserohilum turcicum AND MAIZE DISEASE SYMPTOMATOLOGY IN KENYA
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تاریخ انتشار 1999