辐射处理对大豆有性杂交后代遗传变异及选择效果的影响——Ⅱ.第三代的遗传变异及高世代品系表现

EFFECTS OF TREATING HYBRID SEEDS WITH r-RAY ON GENETIC VARIANCE AND SELECTION EFFECTIVENESS OF PROGENIES IN SOYBEAN——Ⅱ. GENETIC VARIANCE OF THIRD GENERATION AND LINE YIELD OF FOURTH AND FIVETH GENERATIONS

摘要:

以1.0万伦⁶⁰Co—Υ射线照射两个大豆杂交组合的杂交种子,对其后代进行了比较研究,以评价杂交与辐射相结合育种方法的有效性。结果表明:杂交与辐射相结合使用时,后代性状变异主要受杂交控制,比单独杂交的后代有较多的极端类型,因而变异辐度较大。此外,杂交与辐射相结合的后代表现略迟熟,抗倒伏性亦较弱.高世代品系平均产量与最高产品系的产量无显著差异,上述结果说明,用γ射线照射杂交种子并不能提高选择效果.

Abstract:

Habrid seeds from two crosses were treated bY using 10 Kr⁶⁰Co γ-ray, and progenies of the two crosses were compared with that from same habr-id seed that were not treated to evaluate effectiveness of combinition in cross with γ-ray indution in soybean breeding.
The experiment results indicated that characteristic variance was primarily controled by cross for progenies of combinition in cross with γ-ray treatment, even though progenies of combinition in cross with γ-ray induction had more extreme type and wider variance. Advanced generation lines for treatment of combinition in cross with γ-ray induction gave similar mean line yield and highest line yield, slightly late maturity and weaker resistance to lodging compared with cross treatment alone. Those showed that treating habrid seed with γ-ray should nat increase selection effectiveness.