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Plastid Ontogeny during Petal Development in Arabidopsis1

Kevin A. Pyke* and Anton M. Page

School of Biological Sciences, Royal Holloway, University of London, Egham, Surrey TW20 OEX, United Kingdom

Imaging of chlorophyll autofluorescence by confocal microscopy in intact whole petals of Arabidopsis thaliana has been used to analyze chloroplast development and redifferentiation during petal development. Young petals dissected from unopened buds contained green chloroplasts throughout their structure, but as the upper part of the petal lamina developed and expanded, plastids lost their chlorophyll and redifferentiated into leukoplasts, resulting in a white petal blade. Normal green chloroplasts remained in the stalk of the mature petal. In epidermal cells the chloroplasts were normal and green, in stark contrast with leaf epidermal cell plastids. In addition, the majority of these chloroplasts had dumbbell shapes, typical of dividing chloroplasts, and we suggest that the rapid expansion of petal epidermal cells may be a trigger for the initiation of chloroplast division. In petals of the Arabidopsis plastid division mutant arc6, the conversion of chloroplasts into leukoplasts was unaffected in spite of the greatly enlarged size and reduced number of arc6 chloroplasts in cells in the petal base, resulting in few enlarged leukoplasts in cells from the white lamina of arc6 petals.

1   This work was supported by the University of London Central Research Fund.
*   Corresponding author; e-mail k.pyke{at}rhbnc.ac.uk; fax 44-01784-470756.

Plant Physiol. (1998) 116: 797-803
Copyright Clearance Center:   0032-0889/98/116/0797/07
© 1998 American Society of Plant Physiologists




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