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Development and Growth Regulation

Light-Regulated Gravitropism in Seedling Roots of Maize ¹

Department of Botany, University of California, Berkeley, California 94720, Carnegie Institution of Washington, Department of Plant Biology, Stanford, California 94305-1297

Red light-induced changes in the gravitropism of roots of Zea mays variety Merit is a very low fluence response with a threshold of 10^–9 moles per square meter and is not reversible by far red light. Blue light also affects root gravitropism but the sensitivity of roots to blue is 50 to 100 times less than to an equal fluence of red. In Z. mays Merit we conclude that phytochrome is the sole pigment associated with light-induced changes in root gravitropism.

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