. Fundamentals of botany. Botany. ADJUSTMENT TO SURROUNDINGS 135 curvature in the direction of the source of light are positively phototropic; those which respond by a curva- ture in the opposite direction are negatively phototropic. Like geotropism, phototropism is a special kind of irri- tability. Organs growing in the light are, of course, subject to the influence of both light and gravity at the same Fig. 93.—Seedlings of the white lupine {Lupinus albus). At the left, grown under normal illumination; at the right, grown in darkness. Both cultures are of the same age. Phototropic res
. Fundamentals of botany. Botany. ADJUSTMENT TO SURROUNDINGS 135 curvature in the direction of the source of light are positively phototropic; those which respond by a curva- ture in the opposite direction are negatively phototropic. Like geotropism, phototropism is a special kind of irri- tability. Organs growing in the light are, of course, subject to the influence of both light and gravity at the same Fig. 93.—Seedlings of the white lupine {Lupinus albus). At the left, grown under normal illumination; at the right, grown in darkness. Both cultures are of the same age. Phototropic response on a large scale, in nature, is shown in Fig. 92. 133. Effect of Light on Rate of Growth.—Every one is familiar with the fact that stems grown in darkness, or in reduced light, are commonly much elongated, and. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Gager, C. Stuart (Charles Stuart), 1872-1943. Philadelphia, P. Blakiston's son & co.
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