【摘要】 对300多个纯合二倍体结球甘蓝花粉母细胞减数分裂各时期的染色体进行观察,发现自然条件下纯合二倍体甘蓝花粉母细胞在减数分裂的双线期、终变期以及中期Ι出现了高频率的1～3个四价体和中期Ι有高频率的1～3对染色体提早分离和滞后分离2种异常现象,探讨了甘蓝结实率不高与染色体异常行为之间的关系。更多还原

【Abstract】 The chromosomes from more than 300 pollen mother cells of homozygous diploid of Brassica oleraces var.Capitata L.were observed in every period of meiosis.It was found that altofrequent 1-3 quadrivalent appeared in diplotene,diakinesis and metaphase Ι of meiosis of pollen mother cells of B.oleraces var.Capitata under natural conditions,and 2 kinds of abnormal phenomenas such as altofrequent 1-3 pairs of chromosomes separated early or late in metaphase Ι of meiosis.The relationship between low seed setting rate of B.oleraces var.Capitata and chromosome abnormal behavior was explored.更多还原