Vascular endodermis in root nodules of Lupinus luteus L. (fabaceae)

摘要

The development of endodermis ensheathing the vascular system of root nodules was examined in Lupinus luteus L. Within the system, the vascular endodermis was found to attain different developmental stages. Close to the nodule meristems, nodule vascular bundles were surrounded with endodermis with a Casparian band (first developmental stage). In the oldest part of the nodule vascular system, that is, the nodule vascular trace together with its first range ramifications, vascular endodermis in the third developmental stage (not reported previously for the root nodule vascular system) was observed, with a secondary cell wall.