摘要
通过花粉母细胞减数分裂中期Ⅰ染色体配对构型分析、Giemsa C-分带,从普通小麦-大赖草第7条染色体二体异附加系自交后代中选育并鉴定出了93G51-9和93G52-8 2个等臂染色体异附加系。该异附加系在花粉母细胞减数分裂中期Ⅰ,其等臂染色体自身两臂配对频率高,染色体易发生断裂,且又携带有较抗赤霉病的基因,是向小麦转移大赖草赤霉病抗性基因的有用中间材料。
Two scab resistant Triticum aestivum-Leymus racemosus isochromosome addition lines, 93G51-9 and 93G52-8, involving a pair of isochromosomes derived from the self-pollinated progenies of diosomic addition line (Lr. 7) were selected and identified by meiotic configuration analysis combined with Giemsa C-banding. The developed isochromosome addition lines with some scab-resistance are valuable stocks for transferring scab resistance genes into common wheat because of the high pairing frequency of the two arms of the isochromosomes, which often break at centromere.
基金
国家科委攻关项目
Mcknight Foundation项目
关键词
小麦
大赖草
等臂染色体
异附加系
Triticum aestivum
Leymus racemosus
Isochromosome
Addition line
