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Quarterly Journal of Microscopical Science, Vol s2-72, 387-401, Copyright © 1928 by Company of Biologists

Memoirs: The Cytoplasmic Inclusions of Certain Plant Cells

RUTH PATTEN 1, MARGARET SCOTT 1, and J. BRONTË GATENBY 1

1 Zoological Laboratory, Trinity College, Dublin

1. The plant cell has the following cytoplasmic inclusions:

(a) Mitochondria (chondriome).

(b) Plastids (plastidome), probably derived from mitochondria.

(c) Golgi elements (osmiophilic platelets of Bowen).

2. Plant cells often contain vacuolar spaces filled with a watery fluid. These spaces are sometimes canalicular in arrangement, as shown by Bensley eighteen years ago.

3. There is no evidence that these vacuoles are:

(a) Formed from self-perpetuating primordia.

(b) Possessed of a lipoid membrane.

(c) Associated with the Golgi elements (platelets).

4. There is no reliable evidence that the plant-cell cytoplasm contains any type of protoplasmic inclusion not also found in animal cells, for the plasts are probably enlarged mitochondria, as has been suggested by Mottier, Guilliermond, and others.

5. The so-called ‘vacuome’ drawn by Bowen (this paper, p. 391) is found almost always in Weigl (Mann-Kopsch) preparations. Such ‘vacuoles’ and primordia are possibly corrosive-osmic artefacts caused by the non-ability of water to wash out the corrosive sublimate of the Mann's fluid, previous to osmication.

6. The osmiophilic platelets are demonstrable by the Kolatchev and Mann-Kopsch methods, but we have not so far succeeded in showing them with Benda, Flemming-without-acetic, haematoxylin, Champy-haematoxylin, or the silver-nitrate Golgi methods. They resemble closely the dictyosomes of Hemipterous germ cells.






© The Company of Biologists Ltd 1928