| The wheat variety Xifeng Symbol’s seed hereditary foundation and its breeding objectives and countermeasures for rain-fed land in east Gansu Province |
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| DOI：10.7606/j.issn.1000-7601.2008.04.34 |
| Key Words: Longdong winter wheat “Xifeng symbol” improved variety breeding strategy |
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| Abstract: |
| This paper studied the natural environment characteristics of the east area of Gansu Province and Genetic Basis of “Xifeng symbol” wheat variety．The results showed that the main restricted factor of winter wheat production were drought low temperature and less sunshine insect pest．Drought-resistance and cold-resistance of the main cultivated varieties’hereditary basis contain the three major gene groups which include local variety Baiqi wheat Shanxi Xiaobai wheat Bima4 Agricultural University No．183 and Qianjiao wheat new Ukraine No．83 early-maturing No．1of Russian Zaoyang wheat．This paper analyzes regeneration of six breeding practice．It puts forward the model of wheat yield structure the characteristics of dry-land varieties and the objectives to breed new varieties with drought-resistance cold-resistance disease-resistance and high quality．It also introduces the breeding strategies such as judge standard of wheat germplasm carrying out stair hybridization choosing local varieties as parents using directional selection in adverse circumstances diversifying the identification and selection methods. |