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AOBPreview originally published online on October 2, 2002
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Annals of Botany 90: 559-566, 2002
© 2002 Annals of Botany Company

Plastid and Stromule Morphogenesis in Tomato

KEVIN A. PYKE*,1 and CAROLINE A. HOWELLS1

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

* For correspondence. Fax + 44 (0)115 9513298, e-mail kevin.pyke{at}nottingham.ac.uk

Received: 23 May 2002; Returned for revision: 16 July 2002; Accepted: 26 July 2002 Published electronically: 2 October 2002

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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