摘要
三元杂种 [(亚洲棉×比克氏棉 )×陆地棉 ]及其反交的回交后代在性状上发生疯狂分离 ,在育性上分离出 3种类型 :可育型、不完全可育型、不育型。对这 3种类型及三元杂种F1减数分裂及其花粉的形成过程观察表明 ,三元杂种F1及回交后代的不育型 ,不育的根本原因在于减数分裂中期染色体不能正常配对 ,引起部分染色体滞后及染色体不均等分配 ,从而产生多分孢子和微核 ,最终导致不育花粉的产生 ;不完全可育型 ,大部分染色体联合配对成二价体 ,仅个别为单价体 ,这些单价体在后期随机向两极分离 ,产生的二分孢子有的正常 ,有的不正常 ,进而形成的花粉粒仅个别正常 ;可育株染色体配对正常 。
Backcross progenies BC 4F 1 of interspecific hybrid (G.hirsutum×(G.arboreum×G.bickii)) seperated crazily in every characters and many new characters appeared.According to the fertility,the plants of backcross progenies were classified into 3 groups:sterile, semisterile and fertile plant and chromosome behavior during meiosis in pollen mother cell of the interspecific hybrid F 1 and the three types were studied.The main results are as follows:the sterile cause of F 1,BC 4F 1 sterile material in the trispecific hybrid was that the chromosomes could not make a pair normally in meiosis, leading to some lagging, uneven distributing chromosomes, multispores, micronuclei and sterile pollens. In semisterile plants, the chromosomes could make a pair mostly in meiosis, only a few could not make a pair normally.In fertile plants of BC 4F 1, the chromosomes could make a pair normally in meiosis and normal pollen grains were formed, the fertility was recorved.
出处
《华北农学报》
CSCD
北大核心
2001年第1期38-43,共6页
Acta Agriculturae Boreali-Sinica
