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Science 291 (5512): 2405-2407

Copyright © 2001 by the American Association for the Advancement of Science

Regulation of Vegetative Phase Change in Arabidopsis thaliana by Cyclophilin 40 

Tanya Z. Berardini, Krista Bollman, Hui Sun, R. Scott Poethig*

During its development, a plant shoot progresses from a juvenile to an adult phase of vegetative growth and from a reproductively incompetent to a reproductively competent state. In Arabidopsis, loss-of-function mutations in SQUINT (SQN) reduced the number of juvenile leaves and had subtle effects on inflorescence morphology but had no effect on flowering time or on reproductive competence. SQN encodes the Arabidopsis homolog of cyclophilin 40 (CyP40), a protein found in association with the Hsp90 chaperone complex in yeast, mammals, and plants. Thus, in Arabidopsis, CyP40 is specifically required for the vegetative but not the reproductive maturation of the shoot.

Plant Science Institute, Department of Biology, University of Pennsylvania, Philadelphia, PA 19104-6018, USA.
*   To whom correspondence should be addressed. E-mail: spoethig{at}sas.upenn.edu


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