Meeting the Challenge of Yellow Rust in Cereal Crops - ICARDA

The cultivars expressing an infection type MS or MR may carry durable
resistance genes (Brown, Hill and Velasco, 2001; El-Naimi et al., 2001).
Consequently, entries 2, 3, 4, 7, 10 and 11 (see Table 2) may have some form of
durable resistance, such as high-temperature, adult-plant (HTAP) and slow
rusting. This type of resistance is long lasting, because it is controlled by more
than one gene, in other words, polygenic (Dehghani and Moghadam, 2004).
In consideration of the fact that the rust challenge is continuously changing
due to mutation, migration over long distances and in response to selection
pressure of cultivar genotypes on pathogen genotypes (Hovmøller, 2001; Ben
Yehuda et al., 2004), researchers should deploy non-specific resistance instead
of race-specific.
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Table 2. Severity and infection type for commercial cultivars to barley yellow rust
pathogen in 2009 in Ardabil, Iran
Entry
no.
Cultivar
Infection type
Replicate 1 Replicate 2 Replicate 3
1 Walfajre 30M 30MR 30MS
2 Rihane 10MR 20MS-S 20MS
3 Makouee 5R 10MR 0
4 Kavir 30M 20MS 20MR
5 Karoon 70MS 60M 60M
6 Torkman 60MS 60M 60M
7 Dasht 10MS 10MS 20MS
8 Jonob 40MS 40MS-S 40MS
9 Gorgan-4 40MS 30MS 10MR
10 Zarjow 10MR 30MR 30M
11 Arass 20MR 20M 20MR
12 Goharjow 70S 60S 50S
13 Eram 100S 70S 50MS
14 Sina 50M 70MS-S 50MS
15 Shirin 60MR 60M 60M
16 Torsh 100S 100S 100S
17 CB-74-2 40MS-S 20MS 30MS
Check Afzal 80S 70S 70S