First published online May 27, 2005; 10.1105/tpc.105.033191
The Plant Cell 17:1894-1907 (2005)
© 2005 American Society of Plant Biologists
A Conserved Transcription Factor Mediates Nuclear Control of Organelle Biogenesis in Anciently Diverged Land Plants
Yuki Yasumura1,
Elizabeth C. Moylan2 and
Jane A. Langdale3
Department of Plant Sciences, University of Oxford, Oxford OX1 3RB, United Kingdom
3 To whom correspondence should be addressed. E-mail jane.langdale{at}plants.ox.ac.uk; fax 44-1865-275147.
Land plant chloroplasts evolved from those found in the green algae. During land plant evolution, nuclear regulatory mechanisms have been modified to produce morphologically and functionally diverse chloroplasts in distinct developmental contexts. At least some of these mechanisms evolved independently in different plant lineages. In angiosperms, GOLDEN2-LIKE (GLK) transcription factors regulate the development of at least three chloroplast types. To determine whether GLK-mediated regulation of chloroplast development evolved within angiosperms or is a plesiomorphy within land plants, gene function was examined in the moss Physcomitrella patens. Gene expression patterns and loss-of-function mutant phenotypes suggested that GLK gene function is conserved between P. patens and Arabidopsis thaliana, species that diverged >400 million years ago. In support of this suggestion, moss genes partially complement Arabidopsis loss-of-function mutants. Therefore, GLK-mediated regulation of chloroplast development defines one of the most ancient conserved regulatory mechanisms identified in the plant kingdom.
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