【摘要】 1978-1984年,先后五年采用快中子辐照甘薯有性杂交种子23个组合,6543粒种子。研究表明:诱发下胚轴不定芽的适宜注量为3.8×10¹¹和1.1×10¹²中子/厘米²,萌发时间为出苗后22—40天,萌发部位在子叶节下2—3厘米处。用石腊切片观察到:出苗后10—35天,诱发的不定芽是由下胚轴表皮细胞分化而来,起源于单细胞,有42.3—72.7%不定芽品系的色素、叶形、蔓色、茸毛、花器,以及抗病性、品质和产量等性状获得了变异,尤以抗病性、蔓长、节间长度、烘干率等的后代遗传稳定性较强。现已选出了抗病性强、淀粉高、高产有希望的品系5个,以及具有突出抗病基因或高淀粉基因的品系8个,丰富了种质资源,有利于杂交育种。更多还原

【Abstract】 Hybrid seeds of sweet potato were irradiated with fast neutron.The suit- able dosage is 3.8×10¹¹ or 1.1×10¹² n/cm².The induced adventitions buds ori- ginated from epidermal single-cell of hypocotyl and differentiated at 10—35 days after emergence of seedling.The buds 2 or 3 cm below the cotyledonous nodes sprouted after 22—40 days of emergence.42.3—72.7% of the adventitious buds varied in characters such as pigments,leaf shape,hairiness,vine style, flower part,disease resistance,quality,yield etc.Five promising lines 8 strong disease resistance,high starch and high yield have been selected.更多还原