1. The Twentieth Century Trajectory of Plant Biology
Chris Somerville 
Cell 
Volume 100, Issue 1, Pages (January 2000)
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2. 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).
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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.)
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4. 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.
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5. 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.)
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6. 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.)
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