Archive image from page 70 of The cytoplasm of the plant. The cytoplasm of the plant cell cytoplasmofplant00guil Year: 1941 Chapter VI —55— The Plastids ments, which those who hold this opinion think are caused ex- clusively by cytoplasmic currents. From observations of WEISS, SCHIMPER, and Kuster it appears that chloroplasts are capable of becoming distorted and of showing amoeboid movements. This is also recorded for leucoplasts, as will be seen later. Now Sau- VAGEAU showed by observations of seedlings of Saccorhiza bulbosa that when exposed to intense light the chloroplasts, during their
Archive image from page 70 of The cytoplasm of the plant. The cytoplasm of the plant cell cytoplasmofplant00guil Year: 1941 Chapter VI —55— The Plastids ments, which those who hold this opinion think are caused ex- clusively by cytoplasmic currents. From observations of WEISS, SCHIMPER, and Kuster it appears that chloroplasts are capable of becoming distorted and of showing amoeboid movements. This is also recorded for leucoplasts, as will be seen later. Now Sau- VAGEAU showed by observations of seedlings of Saccorhiza bulbosa that when exposed to intense light the chloroplasts, during their movements, present contractions and dilations which can be ex- plained only by movements which they make themselves. Senn, who recognizes the capacity of chloroplasts to move themselves, attributes this to the presence of a cytoplasmic sheath surrounding them which he calls a peristromium. This, according to Senn, gives rise to pseudopodia which permit the chloroplasts to change shape and place. The existence of this peristromium, however, has never been confirmed and remains very problematical.
Size: 1350px × 1481px
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
