分枝列当茎的发育解剖学研究

分枝列当茎的初生分生组织由原表皮、原形成层和基本分生组组织组成。在原形成层束分化为初生维管束的过程中，维管束可通过束内分化出１或几列薄壁细胞的方式分离形成２－４个维管束，使维管束的数目迅速增加。在初生生长过程中，部分髓射线薄壁细胞转变为异常形成层束，异常形成层束再分化产生新的维管束。

Developmental Anatomy Studies on the Stem of Orobanche Aegyptiaca

Primary meristem of stem is composed of protoderm,procambium and ground meristem. In the process of forming primary vascular bundles, vascular bundles are divided into independent vascular bundles by forming one or a few rows parenchyma cells in bundle ,and the number of vascular bundles is on the increas. In the course of primary growth and secondary growth , a few cells of pith ray turn into anomaleus cambium bundles, the anomaleus cambium bundles form new vascular bundles.