NDLI: Loss or retention of chloroplast DNA in maize seedlings is affected by both light and genotype

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Loss or retention of chloroplast DNA in maize seedlings is affected by both light and genotype

Content Provider	Springer Nature Link
Author	Oldenburg, Delene J. Rowan, Beth A. Zhao, Lei Walcher, Cristina L. Schleh, Marc Bendich, Arld J.
Copyright Year	2006
Abstract	We examined the chloroplast DNA (cpDNA) from plastids obtained from wild type maize (Zea mays L.) seedlings grown under different light conditions and from photosynthetic mutants grown under white light. The cpDNA was evaluated by real-time quantitative PCR, quantitative DNA fluorescence, and blot-hybridization following pulsed-field gel electrophoresis. The amount of DNA per plastid in light-grown seedlings declines greatly from stalk to leaf blade during proplastid-to-chloroplast development, and this decline is due to cpDNA degradation. In contrast, during proplastid-to-etioplast development in the dark, the cpDNA levels increase from the stalk to the blade. Our results suggest that DNA replication continues in the etioplasts of the upper regions of the stalk and in the leaves. The cpDNA level decreases rapidly, however, after dark-grown seedlings are transferred to light and the etioplasts develop into photosynthetically active chloroplasts. Light, therefore, triggers the degradation of DNA in maize chloroplasts. The cpDNA is retained in the leaf blade of seedlings grown under red, but not blue light. We suggest that light signaling pathways are involved in mediating cpDNA levels, and that red light promotes replication and inhibits degradation and blue light promotes degradation. For five of nine photosynthetic mutants, cpDNA levels in expanded leaves are higher than in wild type, indicating that nuclear genotype can affect the loss or retention of cpDNA.
Starting Page	41
Ending Page	55
Page Count	15
File Format	PDF
ISSN	00320935
Journal	Planta
Volume Number	225
Issue Number	1
e-ISSN	14322048
Language	English
Publisher	Springer-Verlag
Publisher Date	2006-06-21
Publisher Place	Berlin/Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Chloroplast Chloroplast DNA Fluorescence microscopy Pulsed-field gel electrophoresis Real-time quantitative PCR Zea mays Forestry Ecology Agriculture Plant Sciences
Content Type	Text
Resource Type	Article
Subject	Genetics Plant Science

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