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Plant Physiology 66:82-87 (1980)
© 1980 American Society of Plant Biologists

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Articles

Role of the Cotyledons in the Phototropic Response of Lavatera cretica Seedlings

Amnon Schwartz and Dov Koller

The Hebrew University of Jerusalem, Department of Agricultural Botany, Rehovot, Israel

Young seedlings of Lavatera cretica L. exhibit positive phototropism. The hypocotyl perceives unilateral illumination with blue light and curves towards the light source by unequal growth. In addition, the cotyledonary laminas perceive the vectorial component of unilateral illumination with blue light and reorient normal to the beam by creating a turgor differential in their pulvini. Excision of one cotyledon resulted in negative organotropic curvature of the hypocotyl, away from the remaining cotyledon. Illumination of the cotyledonary lamina did not participate in the phototropic curvature of the hypocotyl, so long as the lamina was free to reorient to face the beam. When the lamina was continuously exposed to vectorial photoexcitation, elongation of the hypocotyl on the side carrying the cotyledon could be enhanced, or inhibited, depending on the direction of the beam striking its lamina.




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 Plant Cell PhysiolHome page
T. Kagawa, M. Kimura, and M. Wada
Blue Light-Induced Phototropism of Inflorescence Stems and Petioles is Mediated by Phototropin Family Members phot1 and phot2
Plant Cell Physiol., October 1, 2009; 50(10): 1774 - 1785.
[Abstract] [Full Text] [PDF]


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Copyright © 1980 by the American Society of Plant Biologists