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Kenya Kudu, a Kenyan wheat variety, exhibits robust adult plant resistance (APR) to leaf rust. To dissect the genetic architecture underlying this resistance, we conducted quantitative trait locus (QTL) mapping using 195 F2∶3 lines derived from a cross between Kenya Kudu and the susceptible cultivar Zhengzhou 5389. Field evaluations were carried out in Baoding, Hebei Province and Zhoukou, Henan Province during the 2017-2018 and 2018-2019 growing seasons. Plants were inoculated with a mixture of virulent Puccinia triticina (Pt) races to assess APR. Phenotypic data on disease severity were integrated with genotypic data from 660K SNP array and SSR markers for QTL analysis. The results demonstrated that three novel adult plant resistance QTLs to leaf rust were identified on wheat chromosomes 2B and 5B. Two QTLs were located on chromosome 5B, provisionally designated as QLr.hbau-5B.1 and QLr.hbau-5B.2, accounting for 8.3~10.5% and 6.9~8.6% of the phenotypic variation, respectively. One QTL located on chromosome 2B, provisionally designated QLr.hbau-2B, accounted for 7.2~10.6% of the phenotypic variation and may correspond to a known leaf rust resistance locus. These results demonstrate that Kenya Kudu's resistance is attributed to the additive effects of multiple minor-effect QTLs. The identified QTLs and their closely linked molecular markers offer critical genetic tools for marker-assisted selection (MAS) in breeding wheat cultivars with durable resistance to leaf rust.
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| 科 Family | 属数 Number of genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) | 属 Genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) |
|---|---|---|---|---|---|---|
| 鹅膏菌科Amanitaceae | 2 | 11 | 5.26 | 鹅膏菌属 Amanita | 10 | 4.78 |
| 小菇科 Mycenaceae | 2 | 12 | 5.74 | 丝盖伞属 Inocybe | 5 | 2.39 |
| 多孔菌科 Polyporaceae | 8 | 14 | 6.70 | 蜡蘑属 Laccaria | 5 | 2.39 |
| 红菇科 Russulaceae | 3 | 23 | 11.00 | 小皮伞属 Marasmius | 6 | 2.87 |
| 小菇属 Mycena | 11 | 5.26 | ||||
| 光柄菇属 Pluteus | 5 | 2.39 | ||||
| 红菇属 Russula | 17 | 8.13 | ||||
| 栓菌属 Trametes | 5 | 2.39 |
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