JXB Advance Access originally published online on April 4, 2006
Journal of Experimental Botany 2006 57(9):1971-1979; doi:10.1093/jxb/erj144
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© The Author [2006]. Published by Oxford University Press [on behalf of the Society for Experimental Biology]. All rights reserved.
The online version of this article has been published under an Open Access model. Users are entitled to use, reproduce, disseminate, or display the Open Access version of this article for non-commercial purposes provided that: the original authorship is properly and fully attributed; the Journal and the Society for Experimental Biology are attributed as the original place of publication with the correct citation details given; if an article is subsequently reproduced or disseminated not in its entirety but only in part or as a derivative work this must be clearly indicated. For commercial re-use, please contact: journals.permissions@oxfordjournals.orgThis paper is available online free of all access charges (see http://jxb.oxfordjournals.org/open_access.html for further details)
RESEARCH PAPER |
The suffulta mutation in tomato reveals a novel method of plastid replication during fruit ripening
Plant Sciences Division, School of Biosciences, University of Nottingham, Sutton Bonington Campus, Loughborough LE12 5RD, UK
*To whom correspondence should be addressed. E-mail: kevin.pyke{at}nottingham.ac.uk
Mutant alleles at the suffulta locus of tomato dramatically affect the pattern of plastid division throughout the plant, resulting in few, greatly enlarged chloroplasts in leaf and stem cells. suffulta plants are compromised in growth and have distinctly pale stems. The green developing tomato fruit are generally paler compared with the wild type, but ripe red fruit are much more similar in colour and pigment content. By using plastid-targeted green fluorescent protein, the underlying plastid phenotypes in the ripening suffulta fruit reveal that enlarged chlorophyll-containing chloroplasts degenerate and give rise to a wild type-like population of chromoplasts in ripe fruit by a process of plastid budding and fragmentation, resulting in a heterogeneous population of plastid-derived structures which eventually become chromoplasts. In stomatal guard cells, plastid-derived structures lacking chlorophyll, but containing GFP, are also observed, especially in guard cells which completely lack normal chloroplasts. How this novel ‘replication’ process in suffulta relates to conventional plastid division and stromule formation is discussed.
Key words: Plastid, plastid differentiation, plastid division, tomato
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