Smithsonian miscellaneous collections . (PUBLICATIOhf 3389) CITY OF WASHINGTON PUBLISHED BY THE SMITHSONIAN INSTITUTION JUNE 2, 1936 1 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOLUME 95. NUMBER 9 PRELIMINARY OBSERVATIONS ON GROWTH AND PHOTOTROPIC RESPONSE OF OAT SEEDLINGS BY ENOCH KARRER Division of Radiation and Organisms Smithsonian Institution i. (Publication 3389) CITY OF WASHINGTON PUBLISHED BY THE SMITHSONIAN INSTITUTION JUNE 2, 1936 Zt^t JSorJ) Q2>afttmore {J)rcee BALTIMOIIE, MD., U. 8. A. PRELIMINARY OBSERVATIONS ON GROWTH ANDPHOTOTROPIC RESPONSE OF OAT SEEDLINGS By ENOCH KARRER Divisi
Smithsonian miscellaneous collections . (PUBLICATIOhf 3389) CITY OF WASHINGTON PUBLISHED BY THE SMITHSONIAN INSTITUTION JUNE 2, 1936 1 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOLUME 95. NUMBER 9 PRELIMINARY OBSERVATIONS ON GROWTH AND PHOTOTROPIC RESPONSE OF OAT SEEDLINGS BY ENOCH KARRER Division of Radiation and Organisms Smithsonian Institution i. (Publication 3389) CITY OF WASHINGTON PUBLISHED BY THE SMITHSONIAN INSTITUTION JUNE 2, 1936 Zt^t JSorJ) Q2>afttmore {J)rcee BALTIMOIIE, MD., U. 8. A. PRELIMINARY OBSERVATIONS ON GROWTH ANDPHOTOTROPIC RESPONSE OF OAT SEEDLINGS By ENOCH KARRER Division of Radiation and Organ-isms, Smithsonian Institution If oat seedlings are germinated while exposed to the continuousspectrum, the shoots in the blue region will curve toward the lightsource. This bending out of the plane of the spectrum is the ordinaryphototropic response. In addition there appears to be a bending withinthe plane of the spectrum. The curvature in the blue just mentionedhas components in the plane of the spectrum such that the tips ofthe seedlings converge. In the deep red, seedlings do not converge asin the blue, but diverge in the plane of the spectrum. In this regionthere is no bending out of the plane of the spectrum. There is noordinary phototropic sensitivity (i)^ in this region. The components of curvature in the
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Keywords: ., bookcentury1800, bookdecade1860, bookidsmiths, booksubjectscience
