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本文以牧草为材料 ,阐述了辐射敏感性的类型划分方法。将异花授粉牧草沙打旺辐照当代的种子直接播种在≥ 1 0℃ (年积温 2 3 0 8℃ )的低温下 ,提高了突变体的适应性 ,增加了选择的准确性 ,缩短了育种周期 ;M1代产生了显性早熟突变 ,M2 代有 2 7 2 %的植株保持早熟 ,比对照早开花 1 6～ 5 1d ,但仍有分离 ;5年育成彭阳早熟沙打旺 ,能在≥ 1 0℃ (年积温 1 847℃ )的地区开花结籽 ;播种当年始花序着生叶位与出苗至开花天数、株高和一级分枝呈极显著正相关。选育产草量高且早熟的沙打旺新品种 ,始花序叶位以在 9～ 1 0个为宜
In this paper, forage grass for the material, described the radiation sensitivity of the classification method. The cross-pollination of the cross-pollination of the cross-pollination pasture directly sowing seeds at a temperature of ≥10 ℃ (annual accumulated temperature of 2380 ℃) increased the adaptability of the mutant, increased the accuracy of selection and shortened Breeding cycle; dominant and early maturing mutants were produced in M1 generation, while M2 plants had precocious puberty in 2772% of plants, which flowed earlier than the control for 16 ~ 51 days but remained isolated; In the region of ≥10 ℃ (accumulative temperature of 1 847 ℃), flowering and seed setting occurred. There was a significant positive correlation between the leaf position and the number of days from emergence to flowering, plant height and first-grade branch in the beginning of sowing. Breeding of high-yielding and precocious new species of Astragalus, the first inflorescence leaf position to 9 ~ 10 is appropriate