文献类型: 外文期刊
作者: Wu, Ling 1 ; Xia, Xianchun 2 ; Rosewarne, Garry M. 3 ; Zhu, Huazhong 1 ; Li, Shizhao 1 ; Zhang, Zhengyu 4 ; He, Zhongh 1 ;
作者机构: 1.Minist Agr, Key Lab Biol & Genet Breeding Wheat Southwest, SAAS, Crop Res Inst, Chengdu 610066, Sichuan, Peoples R China
2.Chinese Acad Agr Sci, Natl Key Facil Crop Gene Resources & Genet Improv, Inst Crop Sci, Natl Wheat Improvement Ctr, Beijing 100081, Peoples R China
3.Dept Econ Dev Jobs Transport & Resources, Biosci Res Div, Horsham, Vic 3400, Australia
4.Sichuan Acad Agr Sci, Inst Plant Protect, Chengdu 610066, Sichuan, Peoples R China
5.CAAS, Int Maize & Wheat Improvement Ctr CIMMYT, China Off, Beijing 100081, Peoples R China
关键词: Puccinia striiformis;yellow rust;Triticum aestivum
期刊名称:PLANT BREEDING ( 影响因子:1.832; 五年影响因子:1.956 )
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收录情况: SCI
摘要: The slow-rusting and mildewing gene Yr18/Lr34/Pm38/Sr57 confers partial, durable resistance to multiple fungal pathogens and has its origins in China. A number of diagnostic markers were developed for this gene based on the gene sequence, but these markers do not always predict the presence of the resistant phenotype as some wheat varieties with the gene are susceptible to stripe rust in China. We hypothesized that these varieties have a suppressor of Yr18. This study was undertaken to determine the presence of Yr18, the suppressor and/or another resistance gene in 144 Chinese wheat landraces using molecular markers and stripe rust field data. Forty-three landraces were predicted to have Yr18 based on the presence of the markers, but had final disease severities higher than 70%, indicating that this gene may be under the influence of a suppressor. Four of these landraces, 'Sichuanyonggang 2', 'Baikemai', 'Youmai' and 'Zhangsihuang', were chosen for genetic studies. Crosses were made between the lines and 'Avocet S', with further crosses of Sichuanyonggang 2 9 'Huixianhong' and Sichuanyonggang 2 9 'Chinese Spring'. The F-1 plants of Sichuanyonggang 2/Chinese Spring was susceptible indicating the presence of a dominant suppressor gene. The results of genetic analyses of F-2:3 and BC1F2 families derived from these crosses indicated the presence of Yr18, a Yr18 suppressor and another additive resistance gene. The Yr18 region in Sichuanyonggang 2 was sequenced to ensure that it contained the functional allele. This is the first report of a suppressor of Yr18/Lr34/Pm38/Sr57 gene with respect to stripe rust response.
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