马蹄纹天竺葵叶斑变异的解剖学观察

植物叶斑是由两种或者两种以上基因型细胞组成的特殊组织结构,在植物发育研究和提高植物观赏性方面具有十分重要的意义。该项研究以天竺葵(Pelargoniumzonal)‘Ms.Pollock’银边绿心型新鲜叶组织为材料,研究斑块结构切片及不同质体细胞的分布,以探索叶斑异化变型机制。结果表明:天竺葵‘Ms.Pollock’突变型异化不是由于细胞突变形成,而是由于质体突变型白色细胞和原型绿色细胞在生长发育过程中相互竞争转轨所致,即白色细胞和原型绿色细胞改变了分裂方向,部分表皮绿色细胞进入第二层,挤压第二层白色细胞转轨进入第三层,导致细胞类型的移位,从而形成异型斑。

Anatomy observation on the leave variegation of Pelargonium zonale

Variegation on plant leaves is a specific constitution consisting of two and more type of different genetic cells. It is importance for the study of the plant development and to improve the ornamental value of horticulture. In this paper,the constitution of the variegation and the distribution of different protoplasts in muted fresh tissues of GWG variegated plant of Pelargonium zonal ‘Ms.Pollock’ were investigated for study on it’s mechanism of variegation changes. The results showed that the changes of the types were not caused by new cell mutation,but by translocation of the different cell types of variegation. The changes of division direction of white cells and green cells resulted that some of the green epidermal cells translocated into the second layer and it pushed furthermore the origin white cells of the second layer into the third layer,so that the variegation altered.