3个甜玉米自交系空间诱变效应及变异系育种潜力研究

Combining Ability of Mutation Lines and Space Mutagenic Effect of 3 Sweet Corn Inbred Lines

以3个甜玉米自交系1132、RC1及1022为基础材料,2006年经卫星搭载返回地面后进行3季种植观察,各发现1个突变株,其中,1132变异株茎节间变短、植株矮化、果穗变粗;RC1变异株株高和穗长增加、单穗重显著增加;1022变异株茎节间距明显增加、株高和穗位变高、果穗变大变粗、雄穗分枝减少。对3个变异株连续6代自交和穗选,获18个稳定变异系。以18个变异系及相应对照为被测系,骨干系HZ3、265OR1、N16为测验种,采用不完全双列杂交,对变异系产量及相关性状、株高及穗位高等进行配合力分析和自身表现评价,结果表明,5个变异系在自身性状表现及重要性状配合力上均表现优良,具有较大育种潜力。

In the research, 1132, RC1 and 1022 were carried by satellite for space mutation and then were plant- ed in the field, one variation plant was found per inbred. The result indicated that variation plant of inbred 1132 had smaller stem internodes length, taller plant height, bigger ear diameter than inbred line 1132; variation plant of inbred RC 1 had higher plant height, longer ear length and heavier weight per ear than inbred line RC 1 ; variation plant of in- bred 1022 had bigger stem internodes length, higher plant and ear height, bigger ear and ear diameter than inbred line 1022, but less tassel branches than inbred line 1022. Eighteen pure variation lines were obtained through six genera- tions selfing and ear selection. According to NC II design, eighteen variation lines and 3 inbred lines CK were selected as tested lines, sweet corn elite inbred lines HZ3, 2650R1, NI6 were selected as testers, 63 combinations were ob- tained. Research on variation lines traits and combination ability performance. The result showed that the five mutation lines had good performance and can be widely used in sweet corn breeding scheme.