Plastid ontogeny during petal development in Arabidopsis.
Plant Physiol
; 116(2): 797-803, 1998 Feb.
Article
en En
| MEDLINE
| ID: mdl-9489024
ABSTRACT
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.
Texto completo:
1
Base de datos:
MEDLINE
Asunto principal:
Arabidopsis
/
Plastidios
Idioma:
En
Revista:
Plant Physiol
Año:
1998
Tipo del documento:
Article
País de afiliación:
Reino Unido