Figure 1. Role of cytoplasmic streaming in cellular growth.

(i) Proximal streaming in the wild-type C. elegans gonad and its role in oocyte growth. (A) Diagram of one arm of an adult hermaphrodite gonad. Plasma membranes, red; nuclei, blue. Somatic sheath cells enclose most of the gonad, but are not shown for simplicity. (B) Single image from time-lapse movie. DIC particles are shown at high magnification in inset. (C) 2-min particle tracks. (Wolke et al., 2007). (ii) Spiral rotational streaming in Chara corallina internodal cell. Regions of opposite flow direction are arranged like the colors on a barber pole, separated by two spiraling lines of missing chloroplasts termed indifferent zones. (i) is reproduced with the permission of the Company of Biologists.