摘要
以中间偃麦草与小麦烟农15的杂种F1及其5个自交和回交世代（F2、F3、BC1、BC2、BC3）为材料，对杂种F1配子形成途径的细胞学特点进行了研究。结果表明，杂种F1减数第一分裂基本正常，在减数第二分裂观察到由于染色体不对称分离产生的无染色质和仅带有徽核的子细胞。小孢子染色体数目为24～35条，根据BC1推算的F1产生的雌配子染色体数目为20～35条。F2根尖细胞和花粉母细胞内染色体数目的平均值分别是54．78和56．41。因此，杂种F1在减数分裂过程中产生了不完全减数的配子，并且不完全减数可能主要是发生在减数第二分裂。
Cytological studies on the mode of gamete formation in F, hybrid between E.intermedium and Yannong 15 were carried out. The results indicated that the first meiotic division of F, hybrid was normal, anucleate cells and cells with micronuclei whichwere produced by asymmetrical separation of chromosomes were observed at the secondmeiotic division. The chromosome numbers of microspores ranged from 24 to 35,and thechromosome numbers of female garnetes of F, hybrid ranged from 20 to 35 which werereckoned from BC, plants. The chromosome averages of root tip cells and PMCs of F, hybrid were 54. 78 and 56. 41, respectively. Therefore, incomplete reduced garnetes wereproduced in meiosis of F1, PMC,which were mainly taken place at the second meiotic division.
出处
《武汉植物学研究》
CSCD
1998年第3期202-206,共5页
Journal of Wuhan Botanical Research
基金
国家"九五"科技攻关项目
关键词
中间偃麦草
小麦
杂种
配子
细胞学
E. inter,nedium, T. aestivum, Hybrid, Gamete, Cytology
