Die Struktur der Chondriosomen und Plastiden im Wurzelmeristem von Zea Mais und Vicia Faba

Abstract

The chondriosomes in the meristem of the root of Zea mays and Vicia faba contain small, short tubules in the interior. These are most nearly comparable to the "tubuli mitochondriales" found in Paramecium species but not to the "cristae" of the chondriosomes in mammals and insects. The presence of a double membrane was established beyond doubt for the chondriosomes. The plastids in the root meristem of both plants are distinguished from the chondriosomes by a rather dense ground structure, but like the former have a quite thick and dense membrane. (A final decision as to the presence of a double membrane could not be made.) More or less numerous, bubble-like structures (7-40) with a thin membrane were embedded in the ground structure of the plastids. In addition, structures were found which possibly may be identical with the stroma lamellae; they are found only in very small numbers (1 to at most 3 in the sections). The row-like arrangement of the tiny bubbles often observed, together with other observations, permits the conjecture that the lamellae originate in this way.