STUDIES ON THE PHYSIOLOGY OF LIGHT ACTION. IV. LIGHT ENHANCEMENT OF AUXIN-INDUCED GROWTH IN GREEN PEAS

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Abstract
In previous investigations it was shown that light inhibits the auxin-induced growth of etiolated pea epicotyl sections. Such a growth inhibition is probably due to a riboflavin -sensitized photooxidation of indoleacetic acid in the medium. With stem sections of light-grown peas, however, light greatly enhances growth[long dash]probably by photosynthesis, since 4% sucrose can essentially replace illumination. Green pea stem tissues require at least 10 mg./l. of indoleacetic acid for optimal growth, or about 100 x as much as is required for optimal growth of the corresponding etiolated tissue. The etiolated tissues are, at their optimal auxin concn., less limited by sugar than the corresponding green, photosynthetic tissue. The simple section growth test involving green pea stem is suggested as a useful procedure in the screening of substances for auxin activity.

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