Figure 3.

Time courses of plasmolytic shrinkage in segments marked on growing sunflower hypocotyls. Segmental shrinkage data from 15 etiolated and 24 light-grown plants were divided into classes defined by the magnitude of turgor-induced strain (see “Materials and Methods” for details). Expressed by shrinkage after 20 h, the classes were defined as: ●, shrinkage between 0% and 95.2% of initial length, n = 168; □, 95.1% to 90.9%, n = 208; ▴, 90.8% to 87.0%, n = 129; ○, 86.9% to 83.3%, n = 56; and ▪, <83.3%, n = 25. Segment length (means ± sd) was plotted class-wise versus time after plasmolysis. Kinetics of shrinkage are similar in all classes, and thus are independent of the amount of elastic strain prevailing before plasmolysis.