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AOBPreview published online on October 2, 2002
Annals of Botany, doi:10.1093/aob/mcf235
© 2002 by Annals of Botany Company
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Submitted on May 23, 2002
Revised on July 16, 2002
Accepted on July 26, 2002

Plastid and Stromule Morphogenesis in Tomato

KEVIN A. PYKE1* and CAROLINE A. HOWELLS1

Affiliation of the authors: 1 Plant Sciences Division, School of Biosciences, University of Nottingham, Sutton Bonington campus, Loughborough, Leicestershire LE12 5RD, UK

* To whom correspondence should be addressed. E-mail: kevin.pyke{at}nottingham.ac.uk.

By using green fluorescent protein targeted to the plastid organelle in tomato (Lycopersicon esculentum Mill.), the morphology of plastids and their associated stromules in epidermal cells and trichomes from stems and petioles and in the chromoplasts of pericarp cells in the tomato fruit has been revealed. A novel characteristic of tomato stromules is the presence of extensive bead-like structures along the stromules that are often observed as free vesicles, distinct from and apparently unconnected to the plastid body. Interconnections between the red pigmented chromoplast bodies are common in fruit pericarp cells suggesting that chromoplasts could form a complex network in this cell type. The potential implications for carotenoid biosynthesis in tomato fruit and for vesicles originating from beaded stromules as a secretory mechanism for plastids in glandular trichomes of tomato is discussed.
Key words: Plastid morphogenesis, chromoplast, stromule, tomato.


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