Archive image from page 86 of The cytoplasm of the plant. The cytoplasm of the plant cell cytoplasmofplant00guil Year: 1941 Chapter VIII â 71 The Chondriome (cont'd) Without knowledge of Pensa's work, Lewitsky, a student of Strasburger, was working at the same time with mitochondrial technique (method of Meves). Lewitsky (1911) showed in the bud of Asparagus officinalis that the chloroplasts are built up from minute elements looking like the chondriosomes of animal cells. This investigator concluded therefore that the plastids, contrary to the opinion of SCHIMPER, do not keep their individual
Archive image from page 86 of The cytoplasm of the plant. The cytoplasm of the plant cell cytoplasmofplant00guil Year: 1941 Chapter VIII â 71 The Chondriome (cont'd) Without knowledge of Pensa's work, Lewitsky, a student of Strasburger, was working at the same time with mitochondrial technique (method of Meves). Lewitsky (1911) showed in the bud of Asparagus officinalis that the chloroplasts are built up from minute elements looking like the chondriosomes of animal cells. This investigator concluded therefore that the plastids, contrary to the opinion of SCHIMPER, do not keep their individuality but arise from chondriosomes which LEWITSKY considers originate, in turn, from a differentiation of the cytoplasm. At the same period (1911) and a little later, in cells of plants belonging to very diverse groups (phanerogam seedlings, nucellus, embryo sac, pollen, asci of Pustularia vesiculosa), we were demonstrating by Regaud's method, the existence of chon- o>® m 5 a) Fig. 34. â Various types of starch formation. 1, â within mito- chondria in young potato tuber; 2-4, compound grains within chondrioconts in the meristem of a young root of castor bean; 5-7, compound grains within chondrioconts in bean root: 8, within fusiform leucoplasts surrounding the nucleus; 9, leucoplasts show- ing successive stages in starch formation. 8, 9, from the root of Phajus grandifolius. Regaud's method. driosomes quite similar in form, as well as in histochemical be- havior, to those of animal cells. Our investigations led us to consider, contrary to the opinion of Lewitsky, that the chondrio- somes are permanent organelles, being transmitted by division from cell to cell and incapable of forming de novo. We were demonstrating besides, by a study of the plumule of barley, that chloroplasts arise by the differentiation of some of the chondrio- somes in cells of the meristem. Finally by a study of the potato tuber and of roots of various seedlings, notably those of castor bean, we
Size: 1429px × 1399px
Photo credit: © Actep Burstov / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: 1940, 1941, archive, atkinson_lenette_may_rogers_1899_, book, bookauthor, bookdecade, bookpublisher, booksponsor, booksubject, bookyear, drawing, guilliermond_alexandre_1876_, historical, history, illustration, image, mblwhoi_library, page, picture, plant_cells_and_tissues, print, protoplasm, reference, vintage, waltham_mass_chronica_botanica_company, zimmermann_a_albrecht_b_1860
