【作者】 李石开； 苏振喜； 吴学英；

【Author】 LI Shi-kai SU Zhen-xi WU Xue-ying(Oil Crop Research Institute,Yunnan Academy of Agricultural Sciences,Kunming 650205,China)

【机构】 云南省农业科学院油料所；

【摘要】 以芥菜型油菜温敏核不育系 K121S 及其母体不育源05S 为材料对其温敏核不育性进行了遗传分析,试验结果初步认为,二者受同一不育基因系统控制,4对隐性重叠基因控制基本不育性,还存在1对活性受温度调节的隐性抑制基因,在其激活状态下可抑制重叠基因的作用而表现可育,使得 K121S 具有夏播不育而秋播可育的温敏性,05S 不具温敏性而呈典型的核不育表现。存在3种不育基因型:温敏型 s₁s₁s₂s₂s₃s₃s₄s₄ii,纯合不育两型系 s₁s₁s₂s₂s₃s₃s₄s₄Ⅱ,杂合不育两型系 s₁s₁s₂s₂s₃s₃s₄s₄Ⅰi,温敏型可作为纯合不育两型系的临时保持系获得全不育群体。测交 F₁全部可育,各分离群体 F₂夏播表现3:1、15:1、63:1、205:1、255:1,秋播3:1、13:3、15:1、61:3、63:1、 253:3、255:1、1021:3和全可育,兄妹交或 F₁回交可能出现的分离为:夏播1:1、3:1、7:1、15:1,秋播1:1、3: 1、7:1、15:1、31:1、5:3、13:3、29:3、61:3和全可育。更多还原

【Abstract】 Inheritance of the thermosensitive genic male sterility（TGMS）in rapeseed-mustard（Brassicajuncea）was studied applying TGMS‘K121S’and its original population-genic male sterile（GMS）line‘05S’.The results showed that their male sterility were controlled by the same set gene system which consisted by four pair of recessive overlapping genes,designated as S₁S₁S₂S₂S₃S₃S₄S₄,besides this,there exist one pair of interactive recessive inhibit gene ‘ii’ which role was adjusted by temperature,it is activation under relative low temperature and can inhibit the role of overlapping sterile genes,but not activity under relative high temperature and the role of overlapping sterile genes can be expressed, that’s the reason of ‘K121S’ was fertile in autumn sowing but sterile in summer under the Kunming’s natural climate,by contraries,‘05S’failed sensitivity to temperature because of including dominant inhibit gene.There were three male sterile genotypes:S₁S₁S₂S₂S₃S₃S₄S₄ii（thermo-sensitivity）,S₁S₁S₂S₂S₃S₃S₄S₄Ⅱ（dominant homogamety,non thermo- sensitivity）,S₁S₁S₂S₂S₃S₃S₄S₄Ⅰi（heterozygosis,non thermo-sensitivity）.Stable full sterile population can be produced by thermo-sensitivity type as temporary maintaner crosses with dominant homogamety type.All test cross F₁ was fertile,F₂ showed segregate ratio of3:1,15:1,63:1,205:1,255:1 insummer sowingand3:l,13:3,15:1,61:3,63:1,253:3, 255:1,1021:3,full sterility in autumn respectively,possible ratio in sib-mating or backeress F₁ are 1:1,3:1,7:1, 15:1 in summer sowing,hur1:1,3:1,7:1,15:1,31:1,5:3,13:3,29:3,61:3 and full sterility in antumn.更多还原