摘要
采用涂片、压片、切片相结合的方法,研究了玉米 T 型、C 型,Y 型不育系的小孢子发生过程。结果表明:C 型不育系后期Ⅰ染色体分离落后,末期Ⅰ出现畸形二分子,末期Ⅱ不同步形成细胞壁。此外,还有低频率的花粉母细胞败育,终变期单价体等。T 型不育系后期Ⅰ染色体分离落后,后期Ⅱ染色体分裂落后。Y 型不育系的小孢子发生过程基本正常。
Microsporogenesis,namely,meiosis of pollen mother cells (PMC_s),was studied by light microscopy.The main results were as follows: Bivalent chromosomes in C-PMC,and T-PMC_s laggedat anaphase Ⅰ,and chromo- some in T-PMC_s atanaphase Ⅱ.At telophase Ⅰ,a part of dyads were abnormal in C- PMC_s.Wall didn't form simultaneously at telophaseⅡ.In some cases,monovalents in C-PMC_s occurred at diakinesis.In addition,aborted PMC_s.and chromosome bridge were observed in C-PMC_s and T-PMC_s,respectively.Radically normal meiosis occur- red in Y-PMC_s.
出处
《上海农业学报》
CSCD
1990年第1期7-14,共8页
Acta Agriculturae Shanghai
关键词
玉米
雄性不育系
小孢子
细胞学
Male-sterile line of maize
Monovalents at diakinesis
Lagging chromosome
Abnormal dyad
