【摘要】 本文采用解剖学方法研究花椰菜、青花菜、结球甘蓝和大白菜在生长发育过程中顶端分生组织结构的变化及之间存在的差异。结果显示它们的顶端分生组织结构都是由最初幼苗的原套-原体结构逐渐发育到过渡型分区结构、典型化五个分区结构,至开始进入生殖生长时期的四个分区结构(形成层状细胞区消失)。四种植物在进入生殖生长后,顶端分生组织细胞行为不同:大白菜和甘蓝顶端亚外套两侧细胞分裂分化形成顶生叶原基,在顶生叶原基内侧的细胞将进行分裂产生花序侧枝原基。花椰菜和青花菜顶端亚外套两侧细胞分裂形成花序分生组织,花序分生组织增生即为花球体;内部解剖结构表现为分生组织不断分裂增多的过程。这些结果为研究花序表型发生的解剖学本质及分子生物学研究分生组织发育方向奠定了基础。更多还原

【Abstract】 In this study,we analyzed shoot apical anatomic changes during the development of Brassica plants including cauliflower(Brasscia oleracea L .var. botrytis),broccoli(B. oleracea L .var italica),Chinese cabbage (Brasscia compestris spp. pekinensis) and cabbage(Brasscia oleracea .L .). It has been showed that all of their apical meristems changed from the original tunica-corpus structure to the intergrade subarea,to typical 5- subarea structure and to 4-subarea structure when they went into reproductive development. The shoot apical meristem(SAM) cells were undergoing in different developmental way among these plants after they began reproductive development. The bilateral cells of sub-tunica of Chinese cabbage and cabbage divided into apical leafy primordial,in which lateral inflorescence meristem arised. While the bilateral cells of sub-tunica of cauliflower and broccoli divided into inflorescence meristem,which proliferated into curd or head. The results presented here provide the base for further investigation of anatomic identity of inflorescence phenotype formation and molecular events associated with meristem fate.更多还原