Reaction Studies of a Select Group of Sorghuh Lines to Le; F Streak Disease (Xanthohonas Holcicola)
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Date
1984-05
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Addis Ababa University
Abstract
From infected sorghum leaves ~ough~ from three different
place, 17 yellol'l coloured bacterial coldmies were isolated. After
having conducted hypersensitivi.y, morphological, physiological
and biochemical tests, including pathogenicity test using sorghum
line W8 1297 as a susceptible host, only one isolate was found to
be Xanthomonas ~lc~cola. the causal organism of bacterial streak
disease of sorghum. Six different inoculation techniques were
compared to achieve an effective method of screening together with
pathogenicity test. The isolated organism induced typical symptomatic
response when the rub and spray method of inoculation was used.
Using the rub and spray method, 31 sorghum lines, 7 from highland
(about 2000 metres), 8 from intermediate (1600-1900 metres),
15 from lowland (800_1600 metres) and sorghum WS 1297 as s control
were examined for resistance to bacterial streak disease caused by
.!.holcicola. High resistance to the disease was sho"m by sorghum
lines 80 K 6056, Gambella 1107, 80 ~ 6088, 81 ESIP 21, 81 ESIP 25,
Melkamash 79, ETS 0601, ETS 4946. Of these 75% are from lowland
and 25% are from highland groups. Sorghum lines IS 9294, IS 9302,
IS 9379, .81 ESIP 29, Dobbs, IS 8686, Muyra white,IS 9923 nnd'thll
control \~S 1297 showed susceptible reactions. Of the susceptible
sorghum lines 62,5% are from intermediate, 25% from lowland and
12.5% from highland groups. The reaction of the other lines range
from moderately resistant to moderately susceptible.
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Biology