| Influence factors of wheat production and its breeding objectives and strategies on Loess Plateau of east Gansu |
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| DOI：10.7606/j.issn.1000-7601.2006.02.09 |
| Key Words: east Gansu,winter wheat, natural factors,breeding objectives,strategies |
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| Abstract: |
| By analyzing the natural factors,the paper points out that drought,low temperature,scant sunshine and the damages of diseases and vermin are the main factors that influence the planting of winter wheat in dry-lands on Loess Plateau of Gansu.According to the 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 importing and creating new genotypes of dry-farming,choosing local varieties as parents,adopting convergent cross,using directional selection in adverse circumstances,selecting under dry and humid environments alternatively,practising shuttle breeding,diversifying the breeding of rust-resistant varieties,and strengthening the breeding of high quality varieties for special purposes. |
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