O poder 'sensacional' do movimento nas plantas: um sisema darwiniano para estudar a evolução do comportamento

First published online November 25, 2009; doi:10.3732/ajb.0900220
American Journal of Botany 96: 2115-2127 (2009)
© 2009 Botanical Society of America, Inc.

Darwin Bicentennial Special Invited Paper

The "sensational" power of movement in plants: A Darwinian system for studying the evolution of behavior 1

Craig W. Whippo2 and Roger P. Hangarter
Indiana University, Department of Biology, Myers Hall 150, 915 East Third Street, Bloomington, Indiana 47405 USA

Received for publication 22 July 2009. Accepted for publication 2 November 2009.

ABSTRACT

Darwin’s research on botany and plant physiology was a landmark attempt to integrate plant movements into a biological perspective of behavior. Since antiquity, people have sought to explain plant movements via mechanical or physiological forces, and yet they also constructed analogies between plant and animal behavior. During the Renaissance and Enlightenment, thinkers began to see that physiochemical explanations of plant movements could equally apply to animal behavior and even human thought. Darwin saw his research on plant movements as a strategic front against those who argued that his theory of evolution could not account for the acquisition of new behavioral traits. He believed that his research explained how the different forms of plant movement evolved as modified habits of circumnutation, and he presented evidence that plants might have a brain-like organ, which could have acquired various types of plant sensitivity during evolution. Upon publication of The Power of Movement in Plants, his ideas were overwhelmingly rejected by plant physiologists. Subsequently, plant biologists came to view the work as an important contribution to plant physiology and biology, but its intended contribution to the field of evolution and behavior has been largely overlooked.

Key Words: associationalism • auxin • circadian • Darwin • evolution • gravitropism • plant behavior • plant movement • sensationalism • tropisms

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