Table 1. Field responses of durum wheat
(DW) and bread wheat (BW) lines to stem rust
|
Crop season |
Wheat species (Total lines) |
Percentage of total lines Resistant |
% lines MS |
Percent of total lines Susceptible |
|||||
|
F R MR X |
<5S 5S - 30S >30S |
||||||||
|
1999-2000 |
DW (211) |
0.5 |
0.9 |
6.6 |
0.0 |
15.2 |
5.7 |
46.1 |
25.1 |
|
BW (1151) |
18.5 |
30.1 |
45.4 |
0.1 |
2.7 |
0.7 |
1.8 |
0.6 |
|
|
1998-99 |
DW (232) |
0.0 |
0.0 |
2.1 |
0.4 |
6.9 |
8.6 |
52.7 |
29.3 |
|
BW (1138) |
39.4 |
5.6 |
39.2 |
0.0 |
5.0 |
5.3 |
4.5 |
1.0 |
|
|
1997-98 |
DW (216) |
1.8 |
3.2 |
13.9 |
0.0 |
10.6 |
9.7 |
41.7 |
19.1 |
|
BW (1001) |
6.2 |
8.9 |
68.9 |
0.1 |
7.2 |
3.0 |
3.7 |
2.0 |
|
|
1996-97 |
DW (185) |
0.0 |
0.0 |
4.3 |
0.0 |
15.1 |
1.6 |
21.6 |
57.4 |
|
BW (1139) |
1.0 |
19.3 |
62.0 |
0.0 |
5.8 |
0.9 |
3.9 |
7.1 |
|
|
(Total
No. of lines) Means
of four crop seasons |
DW (844) |
0.6 |
1.0 |
6.7 |
0.1 |
11.9 |
6.4 |
40.5 |
32.7 |
|
BW (4429) |
16.3 |
16.0 |
53.9 |
0.05 |
5.2 |
2.5 |
3.5 |
2.7 |
|
Reaction Classes: F- freedom from infection
(no uredia), R- resistant (minute
uredia with necrosis), MR- moderately
resistant (small uredia with necrosis / chlorosis), MS- moderately susceptible (medium sized uredia with or without
necrosis / chlorosis), Susceptible-
large uredia without any necrosis / chlorosis,
X- mesothetic response (all kinds of uredia present together)
Susceptible Reaction
Class further sub-classified: <5S –
low level of susceptibility (terminal
rust severity affecting less than 5% of the host tissue), 5S-30S – intermediate level of susceptibility (terminal rust severity affecting
5-30% of the host tissue), >30S
– high level of susceptibility
(terminal rust severity affecting more than 30% of the host tissue)