The Twentieth Century Trajectory of Plant Biology Chris Somerville  Cell  Volume 100, Issue 1, Pages 13-25 (January 2000) DOI: 10.1016/S0092-8674(00)81680-3

Figure 1 Pea Internode Bioassay for Auxin Internodes of etiolated pea seedlings were immersed in water or auxin solution, left to right: water, 0.1 mg, 1.0 mg, 4.0 mg/l of indene-acetic aid. The increased curvature caused by the auxin varies roughly with the log of the auxin concentration (Thimann 1938). Cell 2000 100, 13-25DOI: (10.1016/S0092-8674(00)81680-3)

Figure 2 Effect of Ethylene on Growth of Etiolated Seedlings of Arabidopsis Wild-type Arabidopsis seedlings and one ethylene-insensitive (etr) mutant grown in air containing 10 μl/l ethylene (Bleecker et al. 1988). (Reproduced, with permission, from Science Vol. 241, cover image.) Cell 2000 100, 13-25DOI: (10.1016/S0092-8674(00)81680-3)

Figure 3 Germination of Lettuce Seeds after Alternating Exposures to Red (R) and Far Red (I) Radiation From Toole et al., 1953; reprinted in Sage, 1992. Cell 2000 100, 13-25DOI: (10.1016/S0092-8674(00)81680-3)

Figure 4 A Hypothetical Structure of Chloroplast Membranes Circa 1945 Rectangular hatched bars represent hydrophilic groups, black bars represent lipophilic groups, and combinations of the two at right angles represent chlorophyll molecules. The dumbbell-shaped structures represent carotenoid molecules. Phospholipids are indicated by the black magnet-shaped structures attached to a hatched “handle.” (From Rabinowitch 1945.) Cell 2000 100, 13-25DOI: (10.1016/S0092-8674(00)81680-3)

Figure 5 Preparing to Trace the Path of Carbon in Photosynthesis with 11CO2 Martin Kamen (left) is releasing 11CO2 produced moments before at the Lawrence cyclotron at the University of California, Berkeley into an apparatus held by Sam Reuben that will be used to label the dark reactions of photosynthesis by plants in the background. (From Life Magazine, October 20, 1941.) Cell 2000 100, 13-25DOI: (10.1016/S0092-8674(00)81680-3)