"A set of 90 entries comprising 71 common wheat cultivars, 11 durum wheat cultivars and eight triticale cultivars was tested against stem rust at Njoro, Kenya.
Additionally, a set of 192 lines (Synthetics and international wheat germplasm) that showed good levels of resistance to prevalent Australian rust pathotypes was also tested at Njoro, Kenya."
Key Information
Crop
Wheat
Disease resistance(s)
Wheat stem rust, Wheat stripe rust
Additional Information
"All triticale cultivars displayed resistant (R) responses, whereas four durum cultivars were scored moderately susceptible (MSS), two moderately susceptible (MS), two moderately resistant to moderately susceptible (MRMS), and three as moderately resistant (MR). Seventy-one common wheat cultivars showed a range of responses for resistance to stem rust: 40 cultivars carried acceptable levels of stem rust resistance (0-40% stem rust severity); 16 were susceptible (70-100% severity); 10 cultivars displayed low levels of resistance ranging from 50-60% severity; five winter wheat cultivars did not flower due to inadequate vernalisation and were hence not scorable. The effectiveness of resistance genes Sr15, Sr24 and Sr36 was evident in the nurseries, despite reports in the literature that Ug99 and several of its variants are virulent on these genes.
Forty-four common wheat cultivars were scored resistant (R) and 14 cultivars were rated Resistant/Moderately Resistant to Moderately Resistant (RMR to MR) with severity scores ranging from 10 to 20%. Only five cultivars were scored Moderately Susceptible to Susceptible (MSS to S), with stripe rust ratings of 60-100% severity. Stripe rust severities of the remaining eight cultivars ranged from 30-50% (MRMS to MS). All durum and triticale cultivars exhibited resistant responses.
Forty-eight lines of the international germplasm displayed high levels of stem rust resistance. Twenty three of these 48 lines also showed high levels of stripe rust resistance."