关键词: 小麦, 夏繁, 海拔, 繁殖系数, 发芽率

Abstract: In May 2002, some F₄ and F₅ wheat lines were harvested.These F₄ and F₅ lines of wheat were propagated at Triticeae Research Institute of Sichuan agricultural University, located in Dujiangyan city of Chengdu plain with a low elevation of 704.7 metres in June 2002.After the seeds of these lines were pretreated for 24 hours at 4℃, they were placed in room temperature till germination.The seedlings were transplanted into a minor modified field.The wheat seedlings were fertilized by using 0.25% solution with 60% NH₄HCO₃ and 40% KH₂PO₄ at the seedling stage of 2.5 leaves.Fertilization was repeated every 5 days for 3~4 times.The range of propagated coefficient of F₅ and F₆ seeds was 68.2~110.0 times.There was a germination percentage range from 82.6% to 94.7%.The usefulness in wheat genetic and breeding by doubling seasons is discussed.

Key words: wheat, summer planting, elevation, propagated cofficient, germination percentage